Number one seed Novak Djokovic of Serbia reacts after winning the first set tiebreak 16-14 against Alexandr Dolgopolov of Ukraine during a Men's fourth round match at the US Open tennis tournament on ... more 
Number one seed Novak Djokovic of Serbia reacts after winning the first set tiebreak 16-14 against Alexandr Dolgopolov of Ukraine during a Men's fourth round match at the US Open tennis tournament on September 5, 2011 at the Billie Jean King National Tennis Center in New York. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images) less 
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Getty Images | Photo By STAN HONDA / AFP/Getty Images
Mon, Sep 5, 2011 4:52 PM EDT