Samantha Stosur, the No. 1 seed, defeated Klara Zakopalova 6-1, 6-3 to set up a semifinal match with the fourth-seeded Ivanovic, a 6-4,-6-1 winner over Vesna Dolonc.
The third-seeded Wozniacki topped fifth-seeded Dominika Cibulkova 6-2, 6-7 (1-7), 6-1, and will face Arvidsson in Saturday's semifinals. Arvidsson eliminated No. 7 seed Maria Kirilenko 6-3, 6-3 Friday.
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