Tennis Djokovic racquet

Novak Djokovic of Serbia throws his racquet down in a rare moment of frustration against Mardy Fish...

Novak Djokovic of Serbia throws his racquet down in a rare moment of frustration against Mardy Fish of the U.S. during the Rogers Cup final in Montreal on Sunday, Aug. 14, 2011. (QMI Agency/Ben Pelosse)

, Last Updated: 10:30 AM ET

Novak Djokovic of Serbia throws his racquet down in a rare moment of frustration against Mardy Fish of the U.S. during the Rogers Cup final in Montreal on Sunday, Aug. 14, 2011. (QMI Agency/Ben Pelosse)

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