Rafael Nadal, of Spain, returns the ball to Novak Djokovic, of Serbia, 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

Rafael Nadal, of Spain, returns the ball to Novak Djokovic, of Serbia, 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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