Roger Federer of Switzerland serves the ball to Leonardo Mayer of Argentina in their first round match at the U.S. Open Championships tennis tournament in New York, September 1, 2015. REUTERS/Brendan... more 
Roger Federer of Switzerland serves the ball to Leonardo Mayer of Argentina in their first round match at the U.S. Open Championships tennis tournament in New York, September 1, 2015. REUTERS/Brendan McDermid less 
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Reuters | Photo By BRENDAN MCDERMID / Reuters
Wed, Sep 2, 2015 4:29 AM EDT