Slovakian Daniela Hantuchova was another of the big-name players to progress as she made quick work of Venezuelan Milagros Sequera 6-2, 6-1.
Hantuchova's third-round opponent will be veteran Japanese Ai Sugiyama -- a 6-2, 6-3 winner of Anabel Medina Garrigues of Spain.
Russian Elena Dementieva had little trouble disposing of Ukrainian Kateryna Bondarenko 6-0, 6-4 and will face Dominika Cibulkova in the next round. Cibulkova rallied to upset Italian Francesca Schiavone 3-6, 6-4, 6-4.
Eight seeded men lost, including No. 13 Andy Murray and No. 21 Lleyton Hewitt. Murray, a semi-finalist last year, lost to Mario Ancic 6-2, 2-6, 7-6 (7). Hewitt was eliminated by Jose Acasuso 6-3, 7-6 (4).
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