NEW YORK - SEPTEMBER 09: John Isner of USA returns ball during quarterfinal match against Andy Murray of Scotland at USTA Billie Jean King National Tennis Center on September 09, 2011 in NYC
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NEW YORK - SEPTEMBER 09: John Isner of USA returns ball during quarterfinal match against Andy Murray of Scotland at USTA Billie Jean King National Tennis Center on September 09, 2011 in NYC