On a day of upsets, fourth seed Maria Sharapova booked her place in the quarter-finals of the Western & Southern Open with a 6-2 6-3 win over Svetlana Kuznetsova.
Four seeds fell in Cincinatti on Thursday, although number eight Marion Bartoli was the only one to fall to an unseeded opponent, losing 3-6 7-5 6-3 to Daniela Hantuchova.
Fifth seed Li Na was upset by 10th seed Samantha Stosur, who recorded a 6-4 3-6 6-4, win, and Jelena Jankovic bested Francesca Schiavone 6-3 5-7 6-4.
Elsewhere Shuai Peng saw off Shahar Peer, Nadia Petrova beat Christina McHale and Andrea Petkovic defeated Petra Kvitova.
Second seed and favourite Vera Zvonareva coasted to a 6-2 6-2 win over Petra Martic.
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Four seeds fell in Cincinatti on Thursday, although number eight Marion Bartoli was the only one to fall to an unseeded opponent, losing 3-6 7-5 6-3 to Daniela Hantuchova.
Fifth seed Li Na was upset by 10th seed Samantha Stosur, who recorded a 6-4 3-6 6-4, win, and Jelena Jankovic bested Francesca Schiavone 6-3 5-7 6-4.
Elsewhere Shuai Peng saw off Shahar Peer, Nadia Petrova beat Christina McHale and Andrea Petkovic defeated Petra Kvitova.
Second seed and favourite Vera Zvonareva coasted to a 6-2 6-2 win over Petra Martic.
more..