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

Key Biscayne Tennis

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

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