Unseeded Spanish player Roberto Bautista-Agut has dumped out the fifth seed Juan Martin del Potro in the second round of the Australian Open, taking the match 4-6 6-3 5-7 6-4 7-5.

As expected, the match was dominated by baseline rallies and it was the Argentine who got the better of the opening set, with one break in the fifth game enough to take it 6-4.

Back came Bautista-Agut, who broke at the first time of asking in the second set and moved into a 3-0 lead. Again, the solitary break was enough and he held off five break points in the fifth game to take the set 6-3.

A key break at 6-5 in the third set saw Del Potro restore his lead in the match, but again he was pegged back. He lost serve but broke straight back in the fourth, before being broken once more in the ninth, putting the game into a final set.

Again there was just one break in it and it was the Spaniard who managed it in the penultimate game of the match, before holding serve for a stunning win.