Novak Djokovic of Serbia returns the ball to Florian Mayer of Germany during a Men's first round singles match at the All England Lawn Tennis Championships in Wimbledon, London, Tuesday, June 25, 2013. (AP Photo/Sang Tan)

Associated Press
Novak Djokovic of Serbia returns the ball to Florian Mayer of Germany during a Men's first round singles match at the All England Lawn Tennis Championships in Wimbledon, London, Tuesday, June 25, 2013. (AP Photo/Sang Tan)
Novak Djokovic of Serbia returns the ball to Florian Mayer of Germany during a Men's first round singles match at the All England Lawn Tennis Championships in Wimbledon, London, Tuesday, June 25, 2013. (AP Photo/Sang Tan)
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