Dominika Cibulkova of Slovakia downed top seed Victoria Azarenka of Belarus to pull off a major upset in fourth round action at the French Open on Sunday.
The 15th seed won 6-2, 7-6 (7/4) to set up a quarter-final match with either Samantha Stosur of Australia or Sloane Stephens of the United States.
Azarenka won the Australian Open in January and had been expected to coast past Cibulkova having beaten her seven times out of eight previously. But the little Slovakian, who reached the semi-finals in 2009, handled the cold, windy conditions on the Suzanne Lenglen court far better than the tall Belarusian.
After losing the first set, Azarenka appeared to be getting back on track as she broke to lead 2-0 in the second, but 23-year-old Cibulkova dug deep to run off four games in a row.
Azarenka levelled at 4-4, with the set then going to a tie-break which a pumped-up Cibulkova led from the start to pull off a stunning win.
Earlier Sara Errani of Italy and Angelique Kerber of Germany both reached the quarter-finals at Roland Garros for the first time with straight sets wins.
Errani, seeded 21, defeated Svetlana Kuznetsova of Russia 6-0, 7-5, while 10th seed Kerber ousted Petra Martic of Croatia 6-3, 7-5.
The pair will meet in the last eight in a top half of the draw which had also contained Azarenka.
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