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The second-seeded Sharapova needed nearly three hours to eliminate her ninth-seeded foe by coming back from a first set tie-breaker loss. She overpowered Schnyder late in the second to win the match.

Fifth-seeded Serena Williams opted out of her match against unseeded Alize Cornet of France after sustaining an injury during practice.

It happened all of a sudden, Williams said. I went for a shot and then my back got a little stuck. I tried to wait until the last possible moment to see if I could play.

Jelena Jankovic, the fourth seed, defeated No. 7 seed Venus Williams, 5-7, 6-2, 6-3, while Russia's Chakvetadze ousted Tsvetana Pironkova of Bulgaria, 6-2, 3-6, 6-1.

In Saturday's semifinals, Sharapova plays Jankovic and Chakvetadze faces Cornet.

Sunday's champion will earn $196,900.

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