Hello, and welcome to Sports Mole's live coverage of day four of the US Open at Flushing Meadows.

We are into the fourth day at Flushing Meadows and Great Britain still has three representatives. We are not sure whether that should be a surprise or not, but either way, it's great to have some domestic interest aside from Andy Murray in the last 64. Murray is in action later today against Adrian Mannarino, but up first we have Johanna Konta and Aljaz Bedene.

In a few minutes time, we will begin game-by-game coverage of Konta's tussle with Wimbledon finalist Garbine Muguruza as she looks to reach the third round of a Grand Slam for the first time. After that match has come to a conclusion, Bedene will attempt to do the same when he goes up against Donald Young. That should be a cracking match.

Konta and Muguruza are just about to finish their warm-up, but a couple of things to note before we get started. The pair met on the grass at Eastbourne earlier this summer, a game which Konta won, while the British number two also has 14 successive victories. That's the kind of confidence that you need ahead of an encounter like this.

The two players are ready and it will be Konta to serve first. Game on!

Konta gets herself into the opening rally but ends up drilling a shot long, something which she repeats off a return on the next point. Muguruza looks sharp early on as she puts away a volley for three game points, and she seals a love hold when Konta nets. Imposing start.

Muguruza is all over a couple of second serves sent down by Konta to move into a 0-30 lead, making it six points in a row. Konta stops the rot with two timely first serves that the Spaniard can only return into the net, but it's break point to Muguruza when a return proves too hot to handle for the Brit. However, Konta produces a solid reply, serving her way out of trouble to get on the board.

After the opening two points are shared, Konta drills a backhand into the top of the net but it creeps over and she has 15-30. A Muguruza mistake gives the British number two a break point but after a lengthy rally, she sends a backhand marginally wide. The pair trade huge forehand winners but Muguruza's serving gets her through the game.

We have been treated to some stunning shots so far, but it's also noticeable how both players are prepared to work hard for each point. Konta does exactly that on her first point, and it provides her with the platform to race to three game points. The love hold is sealed when Muguruza blazes a return just long and we remain on serve.

Despite their difference in ranking, it's Muguruza who is making the most mistakes, and two in a row hands Konta a look at 0-30. Konta returns the favour, but a shocking forehand gives the British number two another break point, which is saved with a one-two behind the Spaniard's serve. Konta gets a second chance but again, the ninth seed unloads to stay in the game. The remainder of the game, which lasts at least 12 minutes, is back and forth, with Konta missing with his returns on two more break points, but Muguruza is able to survive. How important could that game be?

Wow! On the second point of the game, Konta shows retrieving skills that Andy Murray would be proud of, before getting a smash back over the net and then executing a backhand passing shot. It's an insane point! She comes through with her second successive love hold. Super stuff!

BREAK! Muguruza looks on course for an easy service hold at 40-15, but Konta is playing superb and connects with a couple of winners to get back to deuce. Here we go again? Maybe not. Muguruza records an ace, but three points in a row for Konta, the last of which was a double fault from her opponent, hands her the break that she deserves.

At 30-0, Konta looks on course for another easy hold, but a few chinks in her armour start to appear and Muguruza takes advantage with two meaty returns. The Spaniard gets a break point, but what composure from Konta, who not only saves it but seals the game with an ace. This is high-quality stuff.

We are nearly an hour into this contest and we are still in the first set. Why? Because Johanna Konta is producing one of the performances of her career...so far! She creates a couple of set points after providing response after response to the hitting of Muguruza, but she can't get over the line. The game lasts almost 10 minutes, but she will have a second chance to get a set on the board.

BREAK! Konta takes the opening point as Muguruza goes long, but the Spaniard responds with a routine drive-volley. Muguruza looks tuned in now and she creates two break points when she catches the line with a huge shot from the baseline, something which Konta can't do at the other end. We are back on serve.

Konta stops a run of four successive points lost with a forehand return winner but Muguruza replies in kind with two huge shots off the ground for 40-15. She holds at the first time of asking and the pressure is on Konta now.

After the opening two points are shared, Konta forces a mistake out of her opponent with a heavy forehand before drilling down a big first serve. An ace gets the job done and we are heading into a tie-break.

Both players go long on the first two points to move the score to 1-1, before Konta holds her serve to put a little bit of pressure on her opponent. The Spaniard levels up with a powerful forehand down the line, but Konta gets the first mini break with a cross-court backhand to the corner of the court. However, Muguruza gets to the change of ends on level terms as Konta goes long.

Konta edges ahead once again when Muguruza misses out on a second-serve return, but she replies with a quite ridiculous forehand winner that catches the back edge of the line. That could be big. An ace takes Muguruza into the lead and within two points of the set, or has she? Konta challenges and it's millimetres out! Muguruza looks deflated and on the replayed point, she goes millimetres wide and Konta has two points on serve to steal the set. Make that one as the most accurate of kicker serves creates space for the backhand conversion for two set points. She only needs one though as Muguruza floats a return long! What. A. Set.

That set lasted 80 minutes. EIGHTY MINUTES!

Surprisingly, neither player has taken a bathroom break. I was hoping that they would because I need one! Here we go with set two.

At 15-15, Muguruza has the chance to put away a backhand but it's wild and she goes long. She looks a little fed up. Konta isn't though. She takes the next two points to hold to 15.

This feels like an important game for Muguruza, but she steps up to produce one of her best games of the day. A well-controlled volley - something that we have barely seen today - puts her on her way to a love hold.

Anyone for another marathon game? A couple of unforced errors from Konta gift three break points to Muguruza but the Brit ends a run of seven lost points in a row when her opponent goes long. A big first serve saves the second break point, before Muguruza nets the following return. We are at deuce, which soon becomes advantage to Konta when a third successive return from the Spaniard fails to find the target. However, it's Konta's turn to miss several game points, before Muguruza squanders a fourth break-point chance. We lost count of the exact totals in that game (it was that long), but the end result is Konta converting an ace and smash to hold serve. We are 100 minutes into this contest. We have had 15 games and a tie-break...

Muguruza is looking a lot more assured in this set, but a couple of double faults in the game keep Konta interested at 40-30. It's not for long though as the Brit goes just long.

A fourth ace from Konta helps move her to three game points, and she seals the love hold when Muguruza misses out with a forehand down the line. The heat must be taking its toll on both players now. You'd expect the points to get a little shorter. I'm not sure who that suits...

Konta has a sniff of a chance at 15-30 but Muguruza plays her out of the next two points with some aggressive play. It should be Muguruza's game but she misses out with an easy forehand into the open court. She holds her nerve though to take the next two points and remain on serve in this set.

At 0-15, Konta is under pressure but she produces a delicately-whipped forehand to get back level. She follows that with a forehand winner down the line. She throws in a double fault to see the game move to deuce, but she takes the game when Muguruza miscues a backhand, that although comes back into court after hitting the net post.

At 0-15, Konta has a chance to convert a lob but she misses and that gifts the momentum back to her opponent. Two aces later and it's 40-15 before another first serve isn't returned. Big moments coming up...

BREAK! Muguruza comes out for the next game on the attack and two blistering shots off the ground earn 0-30, before a third, this time on her backhand wing, creates three break points. Konta saves the first with an ace down the middle, but a double fault hands Muguruza the break. An important one at that.

BREAK! A seventh double fault gives Konta a look at 15-15, but two winners off the ground brings up a couple of set points. The first is saved by Konta, who finds great depth with her return, and so is the second as the Brit drills a forehand winner into the corner. Another return is nailed and it sets up the point for Muguruza to make the mistake and it is break-back point to Konta. Can she take it? She can! It's another double fault from Muguruza. That was remarkable.

Has that knocked the stuffing out of Muguruza? A couple of errors allow Konta to reach 40-0, and the love hold is sealed when the Spaniard nets a return. That's eight points in a row for the Brit. Muguruza will now serve to stay in the match...

Muguruza stops the rot with a big first serve, but another double fault - her ninth - sees the score to move to 15-15. Konta has a look at a second serve but it's miscued, but she gets to 30-30 with a solid forehand into the corner. Konta is two points away. She almost makes it one but Muguruza overpowers her and nicks the point. The Spaniard takes the game with a backhand winner and we are heading into another tie-break.

Konta opens with a first serve that isn't returned, but she's so unlucky with a backhand down the line that just goes wide. She nicks the mini-break when Muguruza goes into double figures with double faults, but the Brit gifts it straight back with a backhand that goes miles long. Muguruza is in position to crunch a return winner on the next point, but she nets, and we remain on serve after five points. Make that six points after Konta goes long with a return.

After the change of ends, Muguruza catches the line with an outswinging serve to move ahead, before Konta double faults. Disaster for the Brit! The next point is a must, but she loses it and it's controversial. Muguruza successfully challenges an out call and is given the point. Konta is FUMING and rightly so. An argument with the umpire ensues but it's three set points to her opponent. The first is saved brilliantly, but she goes long on the second. We are going into a third.

It's worth noting that the New York crowd roundly booed the decision of the umpire, but on reflection, it appears to be the right call. Either way, we are going into a third set but we won't start again for a few minutes because of the enforced heat rule.

We are ready for the resumption. Konta has had some tape applied to her ankle during the break, but it doesn't look anything too serious.

BREAK! Konta returns with a superb return of serve to move to 0-30, but a fifth ace from Muguruza halves the deficit. However, Konta reads a passing shot from her opponent and connects with one of the sharpest volleys that you will ever see. It's two break points, but the first is saved by a massive first serve. The Brit gets into the next rally but Muguruza gets to deuce with a big backhand winner. That's so good. Konta gets a third opportunity, though, as the Wimbledon finalist goes inches long, and she gets the break when Muguruza double faults for a...well, I've lost count. I think it's 11 times now.

After dropping the opening point, Konta has to fight to stay in the next rally but Muguruza nets when attempting a winner. Let off. Konta sends down two big serves to reach 40-15, but Muguruza remains in the game with a routine forehand into the open court. The Brit replies with an ace, though, and she consolidates the break.

BREAK! After the two players trade errors, Konta is extremely lucky to catch the line with a return before following it up with a backhand winner down the line. Muguruza isn't amused. She regains her focus to reach 30-30 with a backhand winner of her own, but Konta has the chance for a double break when the ninth seed goes long. Huge moment here. Well, for as long as it lasted. Big serve from Muguruza and it's deuce. Konta gets another look when her opponent frames a forehand, and she takes it! Muguruza nets and Konta is three games away...

Konta opens the next game with a double fault - not what she needed - but she gets back to 15-15 when Muguruza goes long. The Spaniard does the same off a return, but she moves to 30-30 with a crushing forehand into the corner. The game advances to deuce, but Konta nets to hand a break point to her opponent, which is saved with a gutsy second serve. Muguruza is getting frustrated and her racquet is smashed on the floor when sending a return long to give the game to Konta. Two away...

Two mistakes from Muguruza give Konta a look at 15-30, but the British number two just misses with an attempted return winner. That was close. Her opponent misses with a forehand though, and it's break point to Konta. Well saved by the Spaniard, however, who puts away a backhand from inside the court. Another unforced error gives Konta a second chance, but again, it's saved. A third chance comes Konta's way when Muguruza, yet again, goes long off the ground, but she is showing so much resilience and a big serve out wide saves her again. Back comes Konta, who fires a backhand winner from the baseline for a fourth break point, but Muguruza responds again with her first serve. This is excellent from both players. Muguruza misses with a game point, before another goes begging thanks to a double fault. A third chance goes begging because of...you guessed it...a double fault. Unbelievable. Muguruza does get the job done but we are now closing in on the longest women's match in US Open history. That stands at three hours 20 minutes. We are 12 minutes away.

254 points have been played in this match. In such tough conditions too.

At 0-15, Konta comes with millimetres of a second double fault but she makes it. She is given the point but hawkeye says it was wide, and Muguruza didn't challenge. The Spaniard gets back into the lead when Konta, ironically, fails with a challenge, but a second-serve return is blasted long. It's 30-30, but that becomes 40-30 with an ace down the middle. It's oh so nearly the game to Konta but she misses the line by a millmetre. Another unsuccessful challenge too. Muguruza should have a break point but she squanders a chance off her forehand wing. She gets another chance when Konta throws in a double fault but it's saved with a cross-court backhand, That has served her well today. Two points in a row and Konta holds. Phew. One more to go.

Muguruza registers a much-needed love hold, but I think Konta was happy to take that game off and regroup ahead of what is arguably the biggest service game of her career.

MATCH! Konta begins with a wayward forehand, but she gets so lucky when Muguruza misses with what was a relatively routine forehand. The Brit fires an ace out wide for 30-15 to move two points away, and that becomes one when she catches the line for another ace! It's two match points for Konta, and she takes it! KONTA WINS!

Everyone take a breath. We've just witnessed the longest ever women's match at the US Open and a Brit has won it! She needed three hours and 23 minutes but Johanna Konta has reached her first ever Grand Slam third round by beating the Wimbledon finalist!

I'm sure that you want to know who Konta is playing in the next round. It's going to be another tough one, this time against Andrea Petkovic.

Konta is asked by Sky Sports News how she is feeling. Her response: "Tired!".

Fancy reading a report of Konta's epic triumph? Of course you do. Read more by clicking here.

Due to that match taking what seemed like an eternity and Andy Murray a possible starter in around 20 minutes time, we won't be providing game-by-game updates of the Aljaz Bedene and Donald Young contest but we will of course keep you informed throughout the evening. In the meantime, let's take a look at what has already happened on day four...

Over on Arthur Ashe, Victoria Azarenka and Simona Halep have both progressed into the third round in straight sets. The 2011 US Open champion Samantha Stosur is also through to the last 32 after thrashing Evgeniya Rodnia. In the men's draw, Thomaz Bellucci has made light work of Yoshihito Nishioka, who outlasted Kyle Edmund in the final round of qualifying. The 30th seed is a potential opponent for Andy Murray in round three.

If you want to take a closer look at any of those results, or at the news that is doing the rounds at Flushing Meadows, you can do so by clicking here for our US Open section.

As far as the matches currently in progress are concerned, Stanislas Wawrinka is currently two sets ahead of Chung Hyeon, but the Swiss has required tie-breaks on both occasions. American Jack Sock also looks like he will make it through to the last 32 after establishing a two-set lead over Ruben Bemelmans.

That's all from me for this evening - if Johanna Konta is having a break, then so am I - but I will now pass you on to Callum Mulvihill, who will take you through the Andy Murray match and beyond. Enjoy!

Thanks Darren. There is still so much action to come this evening as Murray prepares to kick off his third-round test on Arthur Ashe. Roger Federer is also due on court against Steve Darcis at around 12am (BST).

Murray is, of course, expected to come through in comfortable fashion against Mannarino and he has already met the Frenchman this season, beating him 6-3 6-3 at Indian Wells. Mannarino claimed a straight-sets win over Konstantin Kravchuk in straight sets to reach the second round.

Here we go then! Both men are ready to go. Murray will serve first.

BREAK! Mannarino is a fantastic shot-maker and he starts the match with a stunning forehand winner as a response to Murray's serve. Murray interrupts the action by handing in a ball which should only be used for the women. Odd slip up from the organisers. Both men find the net with forehands in the next two rallies, before a weak second serve from Murray puts him on the back foot as a long backhand hands Mannarino two break points. Murray saves one with an ace, but a backhand into the net gifts Mannarino an immediate breakthrough. Disappointing start for the third seed!

Murray sprints out wide to catch the ball with a superb backhand winner down the line. Maybe that shot will get him going. The British number one steps in to attack a second serve, but can only find the net. Mannarino is slightly off balance on the baseline and he doesn't get the luck off the top of the net. A well constructed point gets the left-hander back to 30-30 as Murray fails to hunt down the drop shot, but a long backhand hands Murray a break point. Mannarino delivers an ace to force deuce, before following a wide serve with a fine driving volley. Murray misses with the next return to serve as Mannarino secures the hold.

Better from Murray with the second serve as he takes the first point, but Mannarino's impressive start continues when he clips the line with a brilliant backhand winner. An ace and another unreturned serve moves Murray ahead. A deflection off the net helps Mannarino, who watches an awkward backhand from his opponent go long. Murray holds when hawkeye shows Frenchman's was too long.

RESULT! Chung Hyeon battled impressively, but Stan Wawrinka was just too strong as he comes through with a 7-6 7-6 7-6 victory to book a place in the third round.

BREAK! Murray is just starting to vary his shots more often as he goes to the slice a few times in the opening rally, before Mannarino hits back to 15-15. Mannarino uses his second challenge when he thinks he has clipped the line with a serve, but the technology proves he was off target. He is serving with good rhythm, though. Murray gets level when the Frenchman hammers a forehand long, before a lazy forehand into the net hands the Brit a break point. Can he capitalise this time? You bet. Murray chases the wide serve to make Mannarino run and the underdog finds the net to get us back with serve in the opener.

Despite losing his early advantage, Mannarino is the more proactive of the two players as he shows off his ability from the back of the court before sending his rival the wrong way with a forehand winner to make it 15-15. Murray takes the next point, but Mannarino does well to come forward to finish off a rally with an emphatic smash. An ace edged Murray ahead again and he wraps up the game when Mannarino is unable to get his next return of serve in.

Bad news for Jack Sock, who was leading Ruben Bemmelmans by 2-1. The heat has another victim in New York. The American has been forced to retire and he looks close to passing out while receiving treatment on the chair. Let's hope it is not too serious.

Lovely shot from Murray as he attacks the second serve with a perfect winner, before taking control of the next rally to watch Mannarino go wide with a backhand. Mannarino pulls a point back and the frustration is clear for Murray when he blinks first in a long rally by finding the net with the forehand. 30-30. Another second serve is there to be attacked and Murray is rewarded as Mannarino has not time adjust to his powerful stroke. Superb! Mannarino comes in to serve and volley, before adjusting well with the half-volley. Murray is quick enough, but he hits the net with an attempted pass. Even better from Mannarino as he follows a couple of big forehands with a venture to the net and the sliced volley is too good for Murray. The third seed brings it back to deuce twice more as he starts to find a better rhythm at the back of the court, but Mannarino moves ahead with a big serve/forehand winner combo and clinches the hold thanks to a mistake from Murray.

Mannarino's power almost comes as a surprise in the middle of longer rallies as Murray fails to control a volley, but the backhand looks to be the shot to target as the Frenchman hits the net halfway up. It's a comfortable hold as Murray follows an error from his opponent with two aces.

Too good from Murray early in the eighth game as he brings his rival forward with the drop shot before beating him with a superb lob. At 15-15, a wild backhand from the 2012 champion hands Mannarino the advantage and he is off target again while attacking a wide serve. Mannarino continues to hold his own impressively as he follows the big serve with a backhand winner to take the game.

Superb! Mannarino reads the serve correctly and Murray can only watch the powerful backhand winner. A big first serve is too hot for Mannarino to handle, before a miscue from the world number 35 makes it 30-15. Murray delivers another excellent serve, which is followed by a quiet "Come on" from the Brit. An ace hands him the game.

Aljaz Bedene is in a good position a the moment after taking the first set 6-3 against Donald Young. The two players have traded breaks early in the second set. Plenty of drama to come in that match, you would expect.

A long delay to wait for one annoying man to sit down perhaps distracts Mannarino, who misses with a routine backhand, but a big serve gets him back level as he comes forward to finish the next point. Murray is furious when he misses a backhand of his own, before predicting the serve correctly to return a winner with a fantastic cross-court backhand. Mannarino holds his nerve to stretch the court and clinch the hold when Murray fails to get the forehand over at full stretch.

BREAK! The pair trade unforced errors at the start of the game, before Mannarino attacks the second serve once again to take charge and move ahead. Murray then wins just his third point on the second serve with one down the middle. Mannarino does well to force Murray back with a lob after responding to the forehand at half-court and the third seed pays the price for avoiding the smash as he goes long to hand him the break. The Frenchman returns superbly once again before giving Murray no chance with a superb forehand winner. He will serve for the first set.

SET!Some superb defensive tennis at the back of the court helps Murray as he is gifted the second point when Mannarino somehow finds the net with the smash. The door is open at 0-30, and Murray kicks it open with an excellent return of the second serve as Mannarino stretches to hit the net again. Stunning! Mannarino saves the first of three break points with a fantastic sliced drop shot. It does not get better than that. The Frenchman reduces the deficit again by beating the off-balance Murray with a forehand winner. Murray gets the second serve to attack, but can only find the net. Three opportunities missed. The chair umpire calls a wide serve out, but Mannarino is proved right by hawkeye and he has advantage. Murray hits back with an excellent approach and a fine volley to get back to deuce. An unforced error gifts him another break point. Mannarino responds again with another brilliant drop which Murray can only return wide. What a response from the Frenchman! He saves four break points, moves ahead, and wraps up the set with a smash at the net after the serve out wide.

It is not going to be easy for Murray, but the challenge for Mannarino is to keep up this intensity. His eagerness to take the ball so early appears to be causing problems for Murray, who hasn't taken control in the way we may have expected.

Better from Murray, whose serving is much better and Mannarino only gets on the board with a forehand winner off the second serve as the third seed holds to love.

Excellent start to this second set as Murray dominates from the back of the court to prove that Mannarino still has so much work to do on Arthur Ashe. The Frenchman finds the net with a couple of backhands, before Murray is proved wrong when hawkeye shows Mannarino clipped the line with a forehand. Mannarino gets back to 30-30 and Murray is furious when he goes long while attacking a slow second serve. A forehand into the net allows Mannarino to hold. You sense that was an important game early in the second set.

There's a few words of encouragement from the Murray camp when he loses the first point of the game, before pulling level with an ace. He wisely leaves the ball when approaching the net and watches his opponent go long with the forehand. A big first serve out wide is not returned, but Mannarino attacks the second serve impressively to peg Murray back again. However, the next return lands in the middle of the court and Murray punishes his opponent with the forehand.

UPDATE: It is now 1-1 between Bedene and Young after the American won the second set 6-4. John Isner is a set up in his match with Mikhail Youzhny as the home favourites begin to give the crowd something to cheer.

Brilliant from Mannarino, who wins the first two points with ease before displaying his defensive skills to stay with Murray before the Brit finds the net. A first double fault of the match brings it back to 40-15 and Mannarino then goes long with a lazy stroke to offer Murray a glimmer of hope. Murray is forced to attack on the stretch but he gets no luck as the ball clips the net and lands out.

Mannarino just keeps playing fantastic tennis. He wrestles the control from Murray mid-rally and is rewarded when the third seed commits an unforced error. A forehand into the net is followed by a groan from Murray, who is starting to show his frustration with some of the noise coming from the crowd. Mannarino hits the net before failing to return a big first serve. 30-30. Brilliant! The second serve has been vulnerable throughout the match and Mannarino gets around the ball to unleash the forehand winner. A ninth ace of the match saves the break point, before another one moves Murray ahead after hawkeye rejects Mannarino's challenge. Ouch! Murray comes to the net, but Mannarino catches it and strikes the Brit on the back with his backhand. A double fault brings up break point once again, but Murray digs himself out of trouble with another big serve. He has a few harsh words for himself when a mistake sends a forehand wide. Third time lucky? No, Murray delivers an ace down the middle. He then sends Mannarino the wrong way with a superb forehand winner. Ace! How important could that hold be for Murray?

Mannarino is refusing to let missed opportunities change the momentum of this match. He holds his nerve with a textbook smash at mid-court, before watching Murray send a backhand into the net off the second serve. A wide forehand makes it 40-0 and another mistake gifts the game to Mannarino. Excellent work from the Frenchman.

Murray delivers a gift to a fan when an emphatic smash bounces into the stands, before an improved second serve is not returned. A big first serve moves him further ahead and ace secures the hold. Much, much better from Murray.

The confidence is still there for all to see as Mannarino sends a couple of good serves out wide and follows the second with an easy smash. 30-0 becomes 40-0 when Mannarino leaves Murray helpless with a stunning backhand winner down the line. Murray is rewarded for attacking the second serve when Mannarino sends an awkward half-volley long, and a mistake brings the third seed back into the game. A double fault forces deuce and Murray does not look pleased when a frustrated shot from the Frenchman almost hits him. He is in a better mood when a break point arrives thanks to another double fault, but Mannarino responds with an ace. Superb. A wider serve is returned before Mannarino beats the stretching Murray with a backhand winner. What next? An ace to wrap up the game. Nerves of steel.

BREAK! You often see Murray talking to himself and his camp, but it has been a long time since I've seen him this angry on court as a couple of errors gift Mannarino the first two points. Three break points are brought up as Murray approaches the net, only to watch a perfect passing winner from the Frenchman. He does it! Mannarino matches Murray stroke for stroke and the Brit hits the net with a sliced backhand. Mannarino will serve for a 2-0 lead.

SET! It is becoming a nightmare for Murray and his supporters, but all of the credit must go to Mannarino. A dominant first point is followed by a superb drop shot to leave Murray stranded at the back of the court. Three set points arrive when Murray fires a backhand into the net and Mannarino executes the serve and volley for a hold to love. Fantastic from the Frenchman. Can Murray produce an escape act from here?

It is going to take something special from Murray to dig himself out of trouble. If he takes the third set, Mannarino's confidence will surely be tested but the Frenchman has executed his game plan perfectly so far. Murray may have to change his approach slightly.

Murray needed that. He escapes with the first point when Mannarino finds the net from a good position, before quickly holding to love with some big first serves. A jog to the chair suggests that he is trying to get himself going.

BREAK! Mannarino starts with a double fault, but he recovers well to come forward and beat Murray with another brilliant drop shot. Brilliance is followed by mistakes as he delivers another double fault and a wild forehand hands Murray a couple of break points. The third seed defends well behind the baseline, but Mannarino saves one with a fine overhead smash. A sliced serve out wide is too good for Murray, who is unable to return. However, a forehand from Mannarino drifts wide to offer another chance to the Brit. He breaks! Some excellent defence off the wide serve brings the mistake as Mannarino finds the net with the volley. We may look back on this game as the turning point in the match.

The pressure is on Mannarino all of a sudden. Mistakes he was not making earlier on are creeping in as he goes wide with a poor attempt at a smash. Murray capitalises, but has no answer when his opponent unleashes an unstoppable winner to get back to 30-15. Mannarino continues to back himself against the second serve and is just a few inches wide with a forehand down the line. Murray completes the hold with an ace.

Donald Young is now leading Aljaz Bedene 2-1 after taking the third set 6-4, while Isner is two up in his match against Youzhny. 15th seed Kevin Anderson is a set and a break to the good against Austin Krajicek.

In the women's draw, Sabine Lisicki has cruised through with a 6-4 6-0 triumph over Camila Giorgi.

Mannarino looks comfortable again as a couple of good serves take him to 30-15, before Murray produces a reaction from the crowd with a stunning backhand winner while catching the wide serve. The Frenchman holds his nerve and sends Murray wide before hitting a forehand winner into the open court.

Murray is just starting to play the rallies on his terms as Mannarino fails to return a second serve, before the Frenchman is encouraged into a mistake when the third seed steps up the pace of a rally. Superb! Murray is all over his rival as he comes to the net before bringing out the lob, but Mannarino somehow returns with a volley to the delight of the crowd. An attempted backhand winner is just a few inches wide of the line, and Murray is pegged back to deuce when he finds the net with a lazy forehand. It feels like a different match, though. Murray gets to advantage, before producing a winner on the backhand side. A huge show of passion follows. Murray is not going out quietly.

BREAK! Mixed bag from Mannarino early in the game as he produces two wild ground strokes either side of an ace. A double fault follows as Murray receives two break points. He wastes the first one when going long while attacking the second serve, but the second is converted when he finishes a long rally with a fantastic backhand winner. The pressure on Mannarino is beginning to show.

SET! It felt like a different match a few moments ago, and it certainly looks much different now. Mannarino goes wide with an attempted drop early in the game, before Murray strolls to the set with a hold to love. The third seed is back in this match, and in truth, he is the favourite now.

RESULT! John Isner is through to the third round after beating Mikhail Youzhny 6-3 6-4 6-4. The big-serving American is a dangerous opponent for anyone in New York.

Trouble for Mannarino early in the fourth when Murray builds the second point brilliantly with a forehand that clips the line, before the Frenchman goes long on the stretch. 0-30. Fantastic tennis! Murray looks back to his best as he dominates at the back of the court before coming forward to play the perfect drop volley. The first of three break points are gone when he misses the baseline with a lob, before a miscued forehand gives Mannarino hope of escaping. Excellent response from Mannarino as he forces deuce with a fine drop shot after Murray had retreated further behind the baseline. A line call is followed by an overrule from the umpire, and hawkeye sides with Murray. Incredible! You won't see better point than this one in the tournament. Murray chases down one drop shot, before retreating and coming in again to stay in the point. Mannarino sends the volley wide and another break point arrives. Murray plays to the crowd, who are stunned by that exchange. The break should be clinched a few moments later, but Murray finds the net with a powerful forehand. His defensive skills are on show once again when he somehow stays in a long rally, before his backhand flicks the net and lands in. It's a fifth break point. Mannarino continues to remain stubborn by producing a big serve, a drop shot and a fine volley to get back to deuce. The Frenchman edges the next point and clinches the hold with an ace. You have to give him so much credit. What a game!

RESULT! It was going so well for Bedene after he claimed the first set, but Young had delighted the home crowd by fighting back to clinch a 3-6 6-4 6-4 6-2 2 win.

Perfect response to miss those break point opportunities from Murray, who quickly holds to love to pile the pressure back on Mannarino.

Fantastic from Murray. After being gifted the first point, he somehow stays in the next rally with some brilliant defence before Mannarino, who was forced to retreat to chase down a lob, goes long from the net. Mannarino takes the next point, but the chance is there again as Murray returns a second serve with interest down the line. Murray makes the breakthrough! A double fault hands him a vital advantage in the fourth set.

Murray is unrecognisable from the player who struggled through the opening two sets as he sends his opponent wide with a forehand before coming forward to finish the job. Mannarino's eagerness to attack the second serve is still there, but his forehand is not working as it was earlier as he watches a return go long. Some confidence should return when he produces winner off the serve on the other side. Great length on show in the next rally as Murray is forced across the baseline before going wide with the backhand. 30-30. A miscue off the top of the racket edges Murray ahead, but a weak second serve allows Mannarino to draw level again. An ace and a long return from Mannarino is enough for the hold.

The door is open for Murray again when a deflection off the net hands him the control before the forehand winner makes it 15-30. A challenge from Murray follows when he attacks with the return, but hawkeye quickly proves him wrong. Murray is slightly wild with the next return to hand the advantage back to Mannarino, who comes forward with the serve and volley to hold.

Mannarino is starting to look a bit more desperate with his shot-making as he looks to shorten the length of the rallies. Murray will certainly handle the physical challenge of five sets the better of the two players. A comfortable hold to love is perfect for the third seed at the moment. The pressure remains on Mannarino.

Mannarino starts the game with an unforced error, but his camp are cheering again when he follows the wide serve with a cross-court backhand winner. Murray then miscues a drop shot to into the net, before going long with a backhand down the line. Mannarino takes the game with a big unreturned first serve. Good response.

After hitting every target with the forehand earlier on, Mannarino is starting to struggle with the shot as he goes long before striking the net with a tired looking stroke. The second serve from Murray is getting better as Mannarino finds the net with a return and the third seed delivers a big first serve to hold to love once again.

SET! Murray looks to be in an awkward position after sending Mannarino wide but he stays low to find the open court with a fine volley. The returns of serve are asking more questions of Mannarino, who twice fails to build a rally to slip to 0-40. Three set points. One is saved when Murray is unable to return the serve down the middle, before a wider one is sent back into the net. Wait! Murray challenges the serve, which hawkeye proves was long. On second serve, Mannarino goes wide to double fault. Murray is level! Can Mannarino stop the third seed's charge?

Murray starts the decider with his second double fault of the match, but quickly hits back with an 18th ace. 18 is soon followed by 19 as the weary Mannarino starts to show more signs of fatigue on the baseline. Murray pushes his opponent from side to side in a longer rally, and the Frenchman can only find the net with an off-balance forehand. Murray holds to 15.

BREAK! Murray continues to improve as he picks the perfect spot with the return winner and Mannarino delivers a double fault to make it 0-30. Three break points arrive when Mannarino hits the net from well behind the baseline. Murray misses one chance, but Mannarino then goes wide with the backhand. It could be over quickly on Arthur Ashe.

The challenge is quickly fading. Murray is dominating every exchange at the start of the fifth set and Mannarino is struggling just to stay in points. A powerful forehand takes Murray to another comfortable hold. Mannarino needs to produce something special from here.

Mannarino is fully aware of the need to shorten the rallies as he brings out the drop shot and the point goes to the Frenchman when Murray is unable to get the backhand in after chasing down a lob. A couple of attacks at the second serve end in failure for Murray, before Mannarino delivers a defiant forehand winner to clinch the hold.

Murray is furious with himself after an unforced error at the start of the game, but he responds with an ace down the middle. Mannarino is attacking everything. He needs to find the lines, but a wild forehand sails wide of the mark. Murray's defence is there to be appreciated once again as he mixes it up before lobbing from the back of the court, and a long rally finishes when Mannarino goes long with the forehand. The left-hander claims the next point, too, but Murray's serve down the middle is returned long as he retains the advantage.

BREAK! Mannarino is clearly struggling at the back of the court, but his eagerness to attack earns him the first point with a powerful forehand. A double fault follows, before Murray comes to the net, only to fail to get the ball over with a difficult volley. An unforced error brings it back to 30-30. Mannarino goes wide with the serve and his reward is the easy task of putting away a forehand from mid-court. Murray continues to chase down everything and Mannarino goes long, before finding the net in the next rally to give the third seed advantage. The second serve is there to be attacked and Murray's back hand is too hot to handle for Mannarino. Murray will now serve for the match.

GAME, SET AND MATCH! Mannarino displays one final show of defiance with a superb drop shot early in the game, but he is unable to halt the third seed. Murray brings up three match points when Mannarino finds the net with a tired forehand, and a 21st ace finishes the job! What a match.

Many were expecting a routine straight-sets win when Murray arrived on court, but he was left shocked by his own troubles and Mannarino's fantastic start. You can't afford to let the intensity drop against the great players and Mannarino was punished for opening the door to Murray, who just kept getting better as the match progressed. He will have to improve, but the response was fantastic.

RESULT! As the drama took centre stage on Arthur Ashe, a few other matches were completed around Flushing Meadows. Kevin Anderson was simply too strong for Austin Krajicek as the South African eased to a 6-3 6-4 6-2 triumph to reach the third round.

RESULT! Another man through to the third round is Dominic Thiem, who led Denis Istomin 6-4 6-4 1-0 before his opponent was forced to retire.

Lleyton Hewitt, playing in his final US Open, is in action against fellow Australian Bernard Tomic, but the world number one looks to be heading out of the tournament. 24th seed Tomic currently leads 6-3 6-2.

You can now read a full report of Murray's dramatic victory over Mannarino. With the heat playing such a big role in this year's tournament, will the third seed show signs of fatigue when he meets Thomaz Bellucci in the third round? 30th seed Bellucci beat Yoshihito Nishioka in straight sets earlier today.

The locals are happy today!

Speaking to Sky Sports, Murray has just revealed: "I know he was hitting the ball well pushing me off the baseline. I returned well but on break points he came up with big serves. I managed to fight through, it was very physical with a lot of running but I managed to get through."

Roger Federer is up next on Arthur Ashe. We'll have game-by-game coverage of his second-round clash against Steve Darcis. Will the second seed encounter any problems against the Belgian underdog?

My spell comes to an end here, but Stephen Topping is here to take you through Federer vs. Darcis and the rest of the night's action from the US Open. Over to you, Stephen!

Thanks Callum, and good morning tennis fans! Federer is on the way, and we'll have full live commentary of his clash with Steve Darcis shortly.

UPDATE! Tomas Berdych has taken the first set against Jurgen Melzer, but it was not easy for the number six seed. The Austrian took his opponent all the way to a tiebreak, but the favourite came out on top 7-2 to take the set.

SET! Lleyton Hewitt looked down and out after losing the first two sets in his all-Australian clash with Bernard Tomic, but the veteran has just rolled back the years to take the third, hitting four aces and an impressive 12 winners on his way to keeping the match alive.

RESULT! Petra Kvitova has put in an excellent performance to defeat Nicole Gibbs 6-3 6-4 and progress to the third round of the tournament.

Right now, we're going to give you full coverage of Roger Federer's second round tie with Belgian Steve Darcis from the Arthur Ashe Stadium.

Federer raced to a 6-1 6-2 6-2 victory over Leonardo Mayer in the first round, and so Darcis will have to be at the top of his game if he is to overcome the Swiss institution tonight in what is the first ever clash between these two players.

Here we go! Darcis played a great net shot to set the score at 40-15, before a Federer error gave the Belgian the first game. Slow start for the favourite.

Better from Federer, whose service game is looking strong, forcing Darcis into errors. The favourite finished with an ace to wrap up an impressive game.

BREAK! Impressive stuff from Federer, who plays a powerful forehand winner to go 30-0 up. The world number two struggles to return Darcis' serve though, and the Belgian recovers, but with a second break point Federer hits a neat backhand shot beyond his opponent.

Federer serves up a big serve at 122mph - which was just in - before finishing off the game in a simple fashion, rounding it off with a great net shot.

BREAK! An impressive rally goes on for too long for Darcis, who scampers across the baseline to reach Federer's shot before hitting the net to go 15-30 down. Another error from the Belgian puts Federer further ahead, but Darcis recovers on the second break point. The Belgian hit the net twice again though, and his hard work was undone. Federer is looking impressive here!

Well it's never easy against Roger Federer, but Steve Darcis needs to tighten up his game otherwise it will be over before an hour. The Belgian struggles to cope with Federer's full range of shots, and the number two seed finished with an ace to secure another game.

BREAK SET! Brilliant tennis! Federer plays his opponent into a corner before hitting a neat volley to take the first point. Darcis recovers though, before hitting the net to go 15-30 down. Federer produced another sublime volley from under the net, but Darcis hits a strong backhand winner to level up the game again. Federer claimed the advantage though, and another error from the Belgian wrapped up the set.

Well that was quick by Federer, who doesn't seem to want to hang around. Here comes the second set...

Federer's picked up where he left off here. A couple of impressive forehand winners and an ace helped the Swiss star en route to the first game of the second set.

BREAK! Federer attempts a lob to go 30-0 up, but it lands beyond the court, and the Belgian recovered to go 30-15 up - but Federer rediscovered his range to break the Belgian again. Darcis has not won a game since the very first of the match.

Federer's not messing around here, this match isn't going to take long at this rate. The Swiss hits an ace to wrap up another game where Darcis fails to score a point.

Two uncharacteristic errors from Federer gave Darcis a 30-0 lead in the game, but the favourite hit a sweet backhand shot to pull a point back. Darcis kept his composure though, and claimed a first game in ten attempts!

Two quick forehand winners ensured the momentum switched firmly back in Federer's favour, but Darcis claimed a point with some help from the net. An ace put Roger back in control though, and a Darcis error wrapped up the game.

Federer plays a brilliant groundstroke from between his legs when to go 40-15 up, but Darcis recovers well and goes on to take the game.

Superb from Federer, who hits a terrific ace, before producing a dinky little shot to go 40-0 up. Roger wrapped it up in style to go one game away from taking the set.

BREAK SET! Intriguing tennis at the Arthur Ashe. A lengthy rally ends in a Darcis error as the Belgian goes 0-15 down, but he recovers, before the process repeats itself twice over. Darcis takes advantage with Federer's first big mistake of the night, but then hits the net yet again. Federer then takes advantage, before claiming another set with a Darcis error.

RESULT! Elsewhere tonight, Tomas Berdych has produced a stunning display to defeat Jurgen Melzer 7-6 (7-2) 6-1 6-3.

Back at the Arthur Ashe, it's business as usual from the world number two. Darcis is beginning to get frustrated as he struggles to find any kind of rhythm against Federer, who wraps up the game with a terrific serve, forcing the Belgian into an error.

BREAK! Federer hits a brilliant forehand winner just beyond the reach of Darcis to go 40-15 up, but the Belgian recovers from two break point situations. Darcis volleys to take the game, but hits the net, and Federer takes advantage with a superb backhand before breaking at the third attempt.

Federer's service game is just too strong for Darcis. The Swiss hits a terrific ace to go 30-15 up, but a couple of errors help the Belgian recover and take advantage. Federer recovered though with a placed forehand shot, before taking the game.

BREAK! A terrific volley over the net gives Federer the first point of the game, before a backhand shot puts him 40-0 up. Darcis recovers in the first break point, but Federer breaks at the second attempt.

Not long left in this one now. Darcis again struggles to return Federer's serve as the Belgian sinks to 0-30, but he recovers. A quick ace wraps up the game though, and the world number two is nearly over the line.

Can Darcis take a game in this third set, or will Federer get the match done in the next few moments?

Steve Darcis is still in the match - for now. The Belgian hit a terrific forehand volley to go 40-15 up before forcing a rare error from Federer to take his first game of this set.

GAME SET MATCH! That was impressive from Roger Federer, who sends out a title warning at Flushing Meadows this morning! The Belgian never had a sniff of a chance, and the world number two is through to the third round of the US Open.

The five-time champion made light work of his opponent tonight at the Arthur Ashe stadium, hitting an incredible 46 winners and 11 aces on his way to victory.

You can find out how Federer progressed to the third round with our match report, here.

UPDATE! Elsewhere at Flushing Meadows, Australian veteran Lleyton Hewitt took the fourth set 7-5 to set up a deciding final set against his compatriot Bernard Tomic. It's currently 5-5 in that fifth set.

Tomas Berdych progressed into the third round earlier this morning with a straght-sets win over Jurgen Melzer, which you can read about here.

RESULT! Tomic has broken Hewitt to win the final set 7-5 and claim victory over the veteran Hewitt in five sets. The Australian looks exhausted, but after a two-set slip up mid-match, he finally overcame the 34-year-old to progress to the third round.

RESULT! Richard Gasquet has come from a set down to defeat Robin Haase 4-6 6-3 7-6 (7-1) 6-4 and progress to the third round.

You can read about the Frenchman's impressive victory here.

With that defeat to Bernard Tomic, Lleyton Hewitt bids farewell to Flushing Meadows.

Roger Federer was impressive tonight in his win over Steve Darcis, and the world number two will take on Philipp Kohlschreiber in the third round after his 7-6 (7-4) 6-2 6-2 victory over Lukas Rosal earlier. You can read about that performance here.

Now we'll join the match between Petra Cetkovska and Caroline Wozniacki as our final commentary of the night.

Number four seed Wozniacki takes the first game. The Dane went 40-30 ahead after a lenghty rally, before a Cetkovska error wrapped it up.

BREAK! A superb forehand shot puts Cetkovska 30-15 up, but Wozniacki recovers, before a couple of errors give the favourite an early break.

Cetkovska plays some impressive ground strokes, before misplacing a volley opportunity, allowing Wozniacki to recover at 30-30. Cetkovska then gets the better of her opponent after a lengthy rally, but Wozniacki recovers again as the Czech misplaces a forehand shot. Cetkovska then hits the net twice to give her opponent the game.

Trademark performance from Wozniacki so far, who plays sensible, calculated tennis and waits for her opponent to make errors. This time Czetkovska was able to take advantage with an impressive forehand winner, before wrapping up her first game.

BREAK! The world number five is hitting some good serves against Cetkovska, but Wozniacki makes some uncharacteristic errors and her opponent breaks - game on!

BREAK! A third break in a row in the match, as Cetkovska is punished for her positive play by producing a string of errors to give Wozniacki the game.

BREAK! Incredible scenes at Flushing Meadows, as Wozniacki produces four unforced errors to lose another game on her own serve.

Cetkovska wins the first game with serve in four attempts after Wozniacki produces a string of errors to gift her opponent the points.

BREAK! Wozniacki's game plan has been undone here by the world number 149, who capitalises on more errors by the number four seed to take another break and move within a game of the set.

SET! Petra Cetkovska has never been to the third round of the US Open before, could tonight be her night? Four unforced errors gave Cetkovska the game and the first set. Wozniacki is playing badly out there, with just two winners in the entire set. Can she recover?

Earlier this morning, Bernard Tomic overcame Lleyton Hewitt in five sets in the veteran's final US Open match. You can read his thoughts here, after the Australian described the opportunity to play Hewitt as a "privelege".

Back to the action, and Cetkovska continues to impress at Flushing Meadows, with a well-executed volley bringing her to 30-30, before hitting an impressive backhand winner to take advantage. The Czech player hit a sweet forehand shot to break the first game of the second set.

The world number 149 has Wozniacki rocked at Flushing Meadows! The Dane makes more unforced errors to give another game to Cetkovska.

BREAK! An upset could be on the cards here, as Wozniacki produces more and more unforced errors with every game. Cetkovska takes advantage as her opponent hits a backhand shot beyond the court, before another error completes the break. Wozniacki's backhand is all over the place.

BREAK! Cetkovska hits a sublime forehand shot beyond Wozniacki to go 30-0 up, but the 25-year-old recovers, before hitting a neat winner to break.

Cetkovska hits a terrific backhand to force an error from Wozniacki and go 30-0 without the serve, before two errors give the world number 149 a break straight back!

BREAK! What a crucial break that could be for Wozniacki! The Dane hits a clean forehand winner to go 40-30 up, before a double fault by Cetkovska gives the number four seed renewed hope.

Better from Wozniacki, who completes a lengthy rally with a sweet volley, but her opponent recovers and takes a 40-30 lead with a volley of her own. Wozniacki is rescued by an error, before an error of her own gives Cetkovska advantage. The Dane hits an ace to recover, as Cetkovska misses four break points. Wozniacki finally took advantage with an error, and Cetkovska was made to pay for her profligacy.

BREAK! The momentum has shifted! Cetkovska produces a string of errors to give her opponent another break of serve. Has her chance to cause an upset gone now?

It's all Wozniacki now! The 25-year-old has raised her game, and the game's errors are coming from the world number 149 now.

Is the shock back on? Cetkovska hits a great forehand winner to go 30-0 up, before wrapping up the game with an impressive volley.

Cetkovska fails to take a single point from the game, as Wozniacki produces a fine winner to wrap it up. Cetkovska can keep her hopes of a shock alive if she holds her serve...

BREAK SET! Wozniacki races to a 30-0 lead, before two errors see Cetkovska claw it back to 30-30. An impressive backhand then rescues the set for Cetkovska after a double fault had given her rival a set point opportunity, but another double fault gives the Dane her second set point, and Wozniacki takes it. It's a three set game.

Earlier on day four, Andy Murray fought back from two sets down to defeat Adrian Mannarino and progress to the third round of the US Open. Read what he had to say about the epic here.

Here we go then, the final set. Cetkovska keeps the pressure on the world number five with an impressive volley to go 40-30 up, but Wozniacki recovers, before keeping her composure to wait for her opponent's error and take the game.

A first ace for Cetkovska gives her a 40-0 lead, before she wraps the game up with an impressive volley. The world number 149 has stepped up her game here, and this match is finely poised.

A forehand winner gives Cetkovska a 30-15 lead against the serve, but Wozniacki recovers. Another error gives the Czech a break point, but the number four seed recovers again. An ace by Wozniacki gives her the advantage, and she wraps up the game with a Cetkovska error.

Cetkovska draws first blood with a superb forehand winner, before a Wozniacki error doubles her lead. The Dane recovers, but the 30-year-old restores her lead and takes the game.

A neat backhand winner gives Wozniacki a 40-15 lead, before an ace wraps up the game. Not much to separate these two now - who will take the win?

Impressive stuff from Cetkovska! The 30-year-old produces a fine backhand winner, which sends Wozniacki the wrong way, before wrapping up the game.

A fantastic forehand saves the game for Cetkovska, before the Czech misses two break point opportunities. Wozniacki recovers before taking the game. Something needs to give soon in this set!

Both players have really raised their game in this final set, and Cetkovska won't let Wozniacki rest for a moment. The Czech hits a smart forehand shot to take the game, with Wozniacki not able to take a single point.

A superb ace helps Wozniacki on her way to another game, as neither player can find a break in this set. Sit tight folks - there's plenty of tennis remaining tonight!

Wozniacki had a match point opportunity, but a cool volley saved the match for Cetkovska, who kept her composure to take the game.

Wozniacki looks like she's finally finding her range, playing some impressive shots on her way to claiming another game. If she breaks, the number four seed could finally progress to the third round - can she do it now?

Wozniacki misses four break point opportunities before Cetkovska recovers and rescues the match. Both players could have had this match wrapped up ages ago, but now we have a tiebreak to separate the number four seed from the world number 149 - who will come out on top?

GAME SET MATCH! Would you believe it? Petra Cetkovska - the world number 149 - has knocked out the number four seed Caroline Wosniacki in the second round of the US Open! The Czech should have wrapped up the victory in the second set, but finally gets the match after a third set tiebreak. What a match and what a shock!

Caroline Wozniacki is out of the US Open. Find out how with our full match report here.

What a shock at the Arthur Ashe Stadium to end the day's play! Thanks for your company for the past 13 and a bit hours, don't forget that Sports Mole's live text commentary will be back from 4pm with all the action from day five. Goodnight!