Three of the seven Russian women who made the fourth round are already out.
Seventh-seeded Serena Williams appeared to struggle as she dropped a set for the first time this tournament before recovering to beat No. 11 Nadia Petrova 6-1, 3-6, 6-3.
Amelie Mauresmo of France, who is ranked second, had a 6-2, 6-4 win over Evgenia Linetskaya in a mistake-prone match with 11 service breaks.
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