Eighth seed Victoria Azarenka made an early exit after she retired due to a thigh injury when leading TimeaBacsinszky 6-4 2-3, while Ana Ivanovic swept past Olga Govortsova 6-0 7-5.
Number 14 seed Flavia Pennetta demolished her fellow Italian Roberta Vinci 6-1 6-1, 19th seed Nadia Petrova was similarly comfortable in her 6-1 6-2 win against Agnes Szavay, and Alexandra Dulgheru eased past TimeaBacsinszky 6-4 6-2.