Sony

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Rafael Nadal, of Spain, celebrates after defeating Milos Raonic, of Canada, 4-6, 6-2, 6-4 during the Sony Open tennis tournament, Thursday, March 27, 2014, in Key Biscayne, Fla. (AP Photo/Luis M. Alvarez)

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Kei Nishikori of Japan, returns a shot from Roger Federer of Switzerland, at the Sony Open Tennis tournament, Wednesday, March 26, 2014 in Key Biscayne, Fla. (AP Photo/Wilfredo Lee)

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Dominika Cibulkova, of Slovakia, prepares to hit a return to Li Na, of China, during the Sony Open tennis tournament, Thursday, March 27, 2014, in Key Biscayne, Fla. (AP Photo/Luis M. Alvarez)

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Dominika Cibulkova, of Slovakia, prepares to hit a return to Li Na, of China, during the Sony Open tennis tournament, Thursday, March 27, 2014, in Key Biscayne, Fla. (AP Photo/Luis M. Alvarez)

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Li Na, of China, returns the ball to Dominika Cibulkova, of Slovakia, during the Sony Open tennis tournament, Thursday, March 27, 2014, in Key Biscayne, Fla. (AP Photo/Luis M. Alvarez)