Sony

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Kei Nishikori, of Japan, cools off between sets during the match against David Ferrer, of Spain, at the Sony Open Tennis tournament in Key Biscayne, Fla., Tuesday, March 25, 2014. (AP Photo/Alan Diaz)

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Maria Sharapova, of Russia, reacts after defeating Petra Kvitova, 7-5, 6-1 at the Sony Open Tennis tournament, Tuesday, March 25, 2014, in Key Biscayne, Fla. (AP Photo/Lynne Sladky)

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Tommy Robredo, of Spain, returns to Novak Djokovic at the Sony Open Tennis tournament, Tuesday, March 25, 2014, in Key Biscayne, Fla. (AP Photo/Lynne Sladky)

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Novak Djokovic, of Serbia, returns to Tommy Robredo, of Spain, at the Sony Open Tennis tournament, Tuesday, March 25, 2014, in Key Biscayne, Fla. (AP Photo/Lynne Sladky)