Angelique Kerber, of Germany, returns the ball to Ekaterina Makarova, of Russia, during the Sony Open tennis tournament, Monday, March 24, 2014, in Key Biscayne, Fla. (AP Photo/Luis M. Alvarez)

Sony Open Tennis

Angelique Kerber, of Germany, returns the ball to Ekaterina Makarova, of Russia, during the Sony Open tennis tournament, Monday, March 24, 2014, in Key Biscayne, Fla. (AP Photo/Luis M. Alvarez)

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