Tsvetana Pironkova,  of Bulgaria, returns the ball to Angelique Kerber, of Germany, during the Sony Open tennis tournament, Saturday, March 22, 2014, in Key Biscayne, Fla. (AP Photo/Luis M. Alvarez)

Sony Open Tennis

Tsvetana Pironkova, of Bulgaria, returns the ball to Angelique Kerber, of Germany, during the Sony Open tennis tournament, Saturday, March 22, 2014, in Key Biscayne, Fla. (AP Photo/Luis M. Alvarez)

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