Roger Federer fought back from two sets down to snatch a dramatic five set victory against Tomas Berdych on Sunday, retaining his hopes of winning a 14th grand slam title at the Australian Open tennis tournament.
Federer is seeking to equal Pete Sampras's record for grand slam titles.
He appeared listless from the beginning of his fourth round match with the Czech, before he found his form in the middle of the third set and never looked back.
In the biggest shock so far at the tournament, the top women's seed has been knocked out in the fourth round.
The Frenchwoman Marion Bartoli beat the Serbian world number one Jelena Jankovich 6-1 6-4 in Melbourne to advance to the last eight.