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

Key Biscayne Tennis

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

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