Slovakia's Anna Schmiedlova returns the ball to China's Zheng Jie during the first round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Sunday, May 25, 2014. (AP Photo/Michel Euler)
China's Zheng Jie returns the ball to Slovakia's Anna Schmiedlova during the first round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Sunday, May 25, 2014. (AP Photo/Michel Euler)
China's Zhang Shuai returns the ball to Poland's Agnieszka Radwanska during the first round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Sunday, May 25, 2014. (AP Photo/Darko Vojinovic)
Poland's Agnieszka Radwanska returns the ball to China's Zhang Shuai during the first round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Sunday, May 25, 2014. (AP Photo/Darko Vojinovic)
Poland's Agnieszka Radwanska serves during the first round match of the French Open tennis tournament against China's Zhang Shuai at the Roland Garros stadium, in Paris, France, Sunday, May 25, 2014. (AP Photo/Darko Vojinovic)