Serena Williams returns a shot from Agnieszka Radwanska, of Poland, during a semifinal match in the Sony Open tennis tournament, Thursday, March 28, 2013, in Key Biscayne, Fla. (AP Photo/Wilfredo Lee)

Associated Press
Serena Williams returns a shot from Agnieszka Radwanska, of Poland, during a semifinal match in the Sony Open tennis tournament, Thursday, March 28, 2013, in Key Biscayne, Fla. (AP Photo/Wilfredo Lee)
Serena Williams returns a shot from Agnieszka Radwanska, of Poland, during a semifinal match in the Sony Open tennis tournament, Thursday, March 28, 2013, in Key Biscayne, Fla. (AP Photo/Wilfredo Lee)
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