Serena Williams, of the United States, tosses the ball on a serve to Angelique Kerber, of Germany, during the Sony Open tennis tournament, Tuesday, March 25, 2014, in Key Biscayne, Fla. Williams won 6-2, 6-2.(AP Photo/Luis M. Alvarez)

Key Biscayne Tennis

Serena Williams, of the United States, tosses the ball on a serve to Angelique Kerber, of Germany, during the Sony Open tennis tournament, Tuesday, March 25, 2014, in Key Biscayne, Fla. Williams won 6-2, 6-2.(AP Photo/Luis M. Alvarez)

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