Leylah Fernandez admits she has had to pinch herself after she booked her spot in the US Open quarter-finals.
The Canadian, who celebrates her 19th birthday on Tuesday, followed up her stunning third-round win over Naomi Osaka by dumping out a second former champion in the shape of Angelique Kerber in the fourth round.
She came from a set and a break down to win 4-6 7-6 (5) 6-2 and continue an excellent tournament for the teenagers.
Fernandez had never gone past the third round at a grand slam before and she is enjoying the moment.
The 29-year-old has endured an injury-hit season and said: “I’ve been a little bit tired after three good matches here.
“When you don’t have many matches, you always are a little bit stressed before the match. But overall I think I did a good job here and I’m looking forward actually with positive thoughts.”
Second seed Aryna Sabalenka must be quietly eyeing her first grand slam title after going under the radar.
Sabalenka, who reached the Wimbledon semi-final, made it to the last eight in New York for the first time after beating Elise Mertens 6-4 6-1.
French Open champion Barbora Krejcikova won her late night battle with Garbine Muguruza, coming out on top 6-3 7-6 (4).
But – in a week dominated by talk of players leaving the court – there was more drama following Krejcikova’s medical time out late in the second set.
The Czech left the court when trailing 5-6 after complaining of feeling unwell but returned to level up and send the match to a tie-break, which she then won.
Muguruza was not happy, branding her opponent “unprofessional” while shaking hands at the net, but Krejcikova continued to receive treatment and was unable to conduct an on-court interview or do press duties.
