NEW YORK - SEPTEMBER 05: Serena Williams of USA returns ball during 4th round match against Ana Ivanovic of Serbia at USTA Billie Jean King National Tennis Center on September 05, 2011 in New York City, NY
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NEW YORK - SEPTEMBER 05: Serena Williams of USA returns ball during 4th round match against Ana Ivanovic of Serbia at USTA Billie Jean King National Tennis Center on September 05, 2011 in New York City, NY