Novak Djokovic of Serbia reacts during his match of the Monte Carlo Tennis Masters tournament in Monaco against Juan Monaco of Argentina, Thursday, April 18, 2013. (AP Photo/Lionel Cironneau)

Associated Press
Novak Djokovic of Serbia reacts during his match of the Monte Carlo Tennis Masters tournament in Monaco against Juan Monaco of Argentina, Thursday, April 18, 2013. (AP Photo/Lionel Cironneau)
Novak Djokovic of Serbia reacts during his match of the Monte Carlo Tennis Masters tournament in Monaco against Juan Monaco of Argentina, Thursday, April 18, 2013. (AP Photo/Lionel Cironneau)
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