NEW YORK - SEPTEMBER 10: Serena Williams of USA returns ball during semifinal match against Caroline Wozniacki of Denmark at USTA Billie Jean King National Tennis Center on September 10, 2011 in NYC
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NEW YORK - SEPTEMBER 10: Serena Williams of USA returns ball during semifinal match against Caroline Wozniacki of Denmark at USTA Billie Jean King National Tennis Center on September 10, 2011 in NYC