Maria Kirilenko and Jarmila Gajdosova (who went back to her maiden name last month after separating from husband Sam Groth) could surprise.

基里连科和加多索娃（格罗斯，上个月与其前夫离婚后改回其婚前姓）可能爆冷。

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The Belgian struggled to defeat Slovak Jarmila Gajdosova on Wednesday, but was far more impressive in dismissing 14th seed Julia Goerges 6-2 7-5 on Thursday.

CNN: Serena returns with victory in Miami

Former Wimbledon champion Kvitova beat 168th-ranked Jarmila Gajdosova 7-6 (7-2) 6-3, then world No. 18 Safarova upset No. 9 Samantha Stosur 7-6 (8-6) 7-6 (7-4).

CNN: Rafael Nadal overcoming his 'bad feeling'

Russian seeds Svetlana Kuznetsova, Anastasia Pavlyuchenkova and Maria Kirilenko also went through, with the latter to face Canada's Aleksandra Wozniak after eliminating Australia's Jarmila Gajdosova.

CNN: STORY HIGHLIGHTS