Novak Djokovic of Serbia returns a shot to Mikhail Youzhny of Russia during their quarter-final match at the U.S. Open tennis championships in New York, September 5, 2013. REUTERS/Shannon Stapleton ... more 
Novak Djokovic of Serbia returns a shot to Mikhail Youzhny of Russia during their quarter-final match at the U.S. Open tennis championships in New York, September 5, 2013. REUTERS/Shannon Stapleton (UNITED STATES - Tags: SPORT TENNIS) less 
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Reuters | Photo By SHANNON STAPLETON / REUTERS
Thu, Sep 5, 2013 8:52 PM EDT