Serena Williams

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Serena Williams, right, of the United States, and Li Na, of China, pose for photos after the trophy presentation for the women's final at the Sony Open Tennis tournament in Key Biscayne, Fla., Saturday, March 29, 2014. Williams won 7-5, 6-1. (AP Photo/Alan Diaz)

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Serena Williams, right, takes a "selfie" photo with a fan following her 7-5, 6-1 victory over Li Na, of China, during the women's final at the Sony Open Tennis tournament, Saturday, March 29, 2014, in Key Biscayne, Fla. (AP Photo/Alan Diaz)

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Serena Williams celebrates after defeating Li Na, of China, 7-5, 6-1 in the women's final at the Sony Open Tennis tournament, Saturday, March 29, 2014, in Key Biscayne, Fla. (AP Photo/Alan Diaz)

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Li Na, of China, returns to Serena Williams during the women's final at the Sony Open Tennis tournament, Saturday, March 29, 2014, in Key Biscayne, Fla. (AP Photo/Lynne Sladky)

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Serena Williams, of the United States, returns to Li Na, of China, during the women's final at the Sony Open Tennis tournament in Key Biscayne, Fla., Saturday, March 29, 2014. (AP Photo/Alan Diaz)

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Serena Williams, reacts after breaking service against Li Na, of China, in the first set during the final at the Sony Open Tennis tournament, Saturday, March 29, 2014, in Key Biscayne, Fla. (AP Photo/Lynne Sladky)

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Serena Williams serves to Li Na, of China, during the women's final at the Sony Open Tennis tournament, Saturday, March 29, 2014, in Key Biscayne, Fla. (AP Photo/Lynne Sladky)

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Li Na, of China, tosses the ball to serve to Serena Williams during the women's final at the Sony Open Tennis tournament, Saturday, March 29, 2014, in Key Biscayne, Fla. (AP Photo/Lynne Sladky)

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Serena Williams returns to Li Na, of China, during the women's final at the Sony Open Tennis tournament, Saturday, March 29, 2014, in Key Biscayne, Fla. (AP Photo/Lynne Sladky)