Sony

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Dominika Cibulkova, of Slovakia, returns the ball to Agnieszka Radwanska, of Poland, at the Sony Open Tennis tournament in Key Biscayne, Fla., Wednesday, March 26, 2014. (AP Photo/Joel Auerbach)

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Dominika Cibulkova, of Slovakia, returns to Agnieszka Radwanska, of Poland, at the Sony Open Tennis tournament in Key Biscayne, Fla., Wednesday, March 26, 2014. (AP Photo/Joel Auerbach)

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Serena Williams, of the United States, returns the ball to Angelique Kerber, of Germany, during the Sony Open tennis tournament, Tuesday, March 25, 2014, in Key Biscayne, Fla. (AP Photo/Luis M. Alvarez)