Novak Djokovic, of Serbia, returns the ball to Rafeal Nadal, of Spain, during the Sony Open Tennis in Key Biscayne, Fla., Sunday, March 30, 2014. Djokovic won 6-3, 6-3. (AP Photo/J Pat Carter)

Key Biscayne Tennis

Novak Djokovic, of Serbia, returns the ball to Rafeal Nadal, of Spain, during the Sony Open Tennis in Key Biscayne, Fla., Sunday, March 30, 2014. Djokovic won 6-3, 6-3. (AP Photo/J Pat Carter)

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