Sony

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Ryan Harrison prepares to return to Federico Delbonis, of Argentina, at the Sony Open tennis tournament in Key Biscayne, Fla., Thursday, March 20, 2014. (AP Photo/Alan Diaz)

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Jack Sock, of the United States, prepares return to Guido Pella, of Argentina, during a match at the Sony Open tennis tournament in Key Biscayne, Fla., Thursday, March 20, 2014. Sock won 6-3, 6-4 (AP Photo/Alan Diaz)

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Ryan Harrison returns to Federico Delbonis, of Argentina, at the Sony Open tennis tournament in Key Biscayne, Fla., Thursday, March 20, 2014. (AP Photo/Alan Diaz)

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Peng Shuai, of China, returns to Angelique Kerber, of Germany, at the Sony Open tennis tournament in Key Biscayne, Fla., Thursday, March 20, 2014. (AP Photo/Alan Diaz)

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Ana Ivanovic, of Serbia, reacts after defeating Lauren Davis, 6-1, 6-1 at the Sony Open tennis tournament, Thursday, March 20, 2014, in Key Biscayne, Fla. AP Photo/Lynne Sladky)

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Peng Shuai, of China, returns to Angelique Kerber, of Germany, at the Sony Open tennis tournament in Key Biscayne, Fla., Thursday, March 20, 2014. (AP Photo/Alan Diaz)

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Lauren Davis, of the United States, returns the ball to Ana Ivanovic, of Serbia, during a match at the Sony Open tennis tournament, Thursday, March 20, 2014, in Key Biscayne, Fla. AP Photo/Lynne Sladky)

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Angelique Kerber, of Germany, celebrates after defeating 6-3, 1-6, 7-6, Peng Shuai, of China, at the Sony Open tennis tournament in Key Biscayne, Fla., Thursday, March 20, 2014. (AP Photo/Alan Diaz)