Serena Williams staged an impressive comeback against Caroline Wozniacki to claim a place in the quarter-finals of the Madrid Open.
The ninth-seeded American was comprehensively outplayed in the opening set of their third-round tie, but hit back to wrap up a 1-6 6-3 6-2 victory in one hour and 42 minutes.
Williams was broken three times in the first set by her Danish opponent, seeded sixth, but turned the tables on Wozniacki with four breaks of her own over the next two sets.
Her reward is a last-eight clash with second seed Maria Sharapova, who advanced after opponent Lucie Safarova withdrew before their clash through illness.
Fourth seed Agnieszka Radwanska also progressed to the next round, beating Roberta Vinci of Italy 7-6 (7/1) 6-4.
Qualifier Lucie Hradecka, who accounted for third seed Petra Kvitova yesterday, continued her run with a 6-2 7-6 (7/5) success over Ekaterina Makarova to reach the quarter-finals.
In the men's third round, sixth seed Tomas Berdych was an easy 6-1 6-1 winner over Gael Monfils of France.
However, fourth seed Jo-Wilfried Tsonga saw his Madrid challenge ended with a 7-5 3-6 7-6 (7/2) defeat to Ukraine's Alexandr Dolgopolov.
