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

Sony Open Tennis

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

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