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. Cibulkova won 3-6, 7-6 (5), 6-3. (AP Photo/Joel Auerbach)

Key Biscayne Tennis

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. Cibulkova won 3-6, 7-6 (5), 6-3. (AP Photo/Joel Auerbach)

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