Dominika Cibulkova caused the biggest upset in the fourth round of the tournament by beating the favourite Victoria Azarenka. Sara Errani, Samantha Stosur and Angelique Kerber also make it to the quarter-final.
The first four matches of the fourth round in Roland Garros got under way on Sunday, with one of them throwing up the surprise result of the tournament so far.
Number one seed Victoria Azarenka was beaten 6-2, 7-6 by Dominika Cibulkova, a result which could allow Maria Sharapova to recuperate her no.1 spot in the WTA rankings after many years, should she reach the final of this competition, something she has never managed to do before.
Cibulkova, who reached the Roland Garros semi-finals in 2009, was superior to Azarenka throughout the tie, complicating matters for the Belarusian from the very beginning. After losing the first set 6-2, Azarenka reacted. However, despite pulling of a successful fight back against Alberta Brianti earlier on in the competition, this time round she had to bow out against an impeccable Cibulkova, even though she forced a tie-break in the second set.
The Slovakian will be hoping to make it back to the semis when she takes on Sam Stosur next, a finalist herself in 2010. The Australian came out on top in her fourth round clash with Sloane Stephens (7-5, 6-4).
One of the other quarter-final ties will see Sara Errani take on Angelique Kerber. The Italian, who is enjoying a spectacular clay season, beat Svetlana Kuznetsova 6-0, 7-5 to make it to the quarters, the furthest she has ever made it at Roland Garros. Meanwhile, Kerber sent Petra Martic out of the competition (6-3, 7-5).
Monday will see Maria Sharapova, Petra Kvitova and defending champion Na Li looking for a place in the quarter-finals, where Jarmila Gajdosova faces Anastasia Rodionova.