Angelique Kerber, of Germany, returns to Peng Shuai, of China, at the Sony Open tennis tournament in Key Biscayne, Fla., Thursday, March 20, 2014. (AP Photo/Alan Diaz)
Peng Shuai, of China, returns to Angelique Kerber, of Germany, at the Sony Open tennis tournament in Key Biscayne, Fla., Thursday, March 20, 2014. (AP Photo/Alan Diaz)
Peng Shuai, of China, returns to Angelique Kerber, of Germany, at the Sony Open tennis tournament in Key Biscayne, Fla., Thursday, March 20, 2014. (AP Photo/Alan Diaz)
Angelique Kerber, of Germany, celebrates after defeating 6-3, 1-6, 7-6, Peng Shuai, of China, at the Sony Open tennis tournament in Key Biscayne, Fla., Thursday, March 20, 2014. (AP Photo/Alan Diaz)