Serena Williams, of the United States, returns the ball to Angelique Kerber, of Germany, during the Sony Open tennis tournament, Tuesday, March 25, 2014, in Key Biscayne, Fla. (AP Photo/Luis M. Alvarez)

Key Biscayne Tennis

Serena Williams, of the United States, returns the ball to Angelique Kerber, of Germany, during the Sony Open tennis tournament, Tuesday, March 25, 2014, in Key Biscayne, Fla. (AP Photo/Luis M. Alvarez)

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