Peng is 2-0 against Petrova this year, but both matches went to three sets.

彭帅今年对战佩特洛娃两战全胜，但是每场比赛都打到了第三盘。

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Petrova and Stosur seemed to have momentum on their side after winning the second set, but the super-tiebreak format allows both teams to start anew, and that worked in Dulko and Pennetta's favor.

在佩特洛娃和斯托瑟赢下第二局后，比赛似乎倒向了她们一边，但是超级抢七规则让两队不得不重新开始，而杜尔科和佩内塔似乎更适应这项规则。

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Denmark's Caroline Wozniacki, Azarenka and Russia's Nadia Petrova, ranked 8-10, also received first-round byes.

CNN: Sharapova on song as L.A. seeds tumble

Sara Errani and Roberta Vinci are due to play doubles against Anastasia Pavlyuchenkova and Nadia Petrova.

BBC: Flavia Pennetta

Sixth seed Nadia Petrova , of Russia, routed Italian Antonella Serra Zanetti 6-0 6-1.

BBC: SPORT | Tennis | Clijsters eases into third round