Novak Djokovic of Serbia plays a return to Spain's Rafael Nadal, during their final match of the Monte Carlo Tennis Masters tournament in Monaco, Sunday, April 21, 2013. (AP Photo/Claude Paris)

Associated Press
Novak Djokovic of Serbia plays a return to Spain's Rafael Nadal, during their final match of the Monte Carlo Tennis Masters tournament in Monaco, Sunday, April 21, 2013. (AP Photo/Claude Paris)
Novak Djokovic of Serbia plays a return to Spain's Rafael Nadal, during their final match of the Monte Carlo Tennis Masters tournament in Monaco, Sunday, April 21, 2013. (AP Photo/Claude Paris)
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