Novak Djokovic of Serbia returns the ball to Pablo Carreno Busta of Spain during their third round match of the Monte Carlo Tennis Masters tournament in Monaco, Thursday, April 17, 2014. Djokovic won 6-0, 6-1. (AP Photo/Michel Euler)

Monte Carlo Tennis Masters

Novak Djokovic of Serbia returns the ball to Pablo Carreno Busta of Spain during their third round match of the Monte Carlo Tennis Masters tournament in Monaco, Thursday, April 17, 2014. Djokovic won 6-0, 6-1. (AP Photo/Michel Euler)

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