Maria Sharapova, of Russia, returns to Serena Williams at the Sony Open Tennis tournament in Key Biscayne, Fla., Thursday, March 27, 2014. (AP Photo/Alan Diaz)
Serena Williams reacts after losing a point to Maria Sharapova, of Russia, at the Sony Open Tennis tournament in Key Biscayne, Fla., Thursday, March 27, 2014. (AP Photo/Alan Diaz)
10ThingstoSeeSports - Serena Williams celebrates after scoring a point against Caroline Garcia, of France, at the Sony Open tennis tournament in Key Biscayne, Fla., Saturday, March 22, 2014. Williams won 6-4, 4-6, 6-4. (AP Photo/Alan Diaz, File)
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)