Peng Shuai, of China, reacts after defeating Belinda Bencic, of Switzerland, during the quarterfinals of the 2014 U.S. Open tennis tournament, Tuesday, Sept. 2, 2014, in New York. (AP Photo/Mike Groll)
Switzerland's Belinda Bencic returns the ball during the first round match of the French Open tennis tournament against Venus Williams of the US at the Roland Garros stadium, in Paris, France, Sunday, May 25, 2014. (AP Photo/David Vincent)
Venus Williams of the US returns the ball during the first round match of the French Open tennis tournament against Switzerland's Belinda Bencic at the Roland Garros stadium, in Paris, France, Sunday, May 25, 2014. (AP Photo/David Vincent)
Switzerland's Belinda Bencic adjusts her cap during the first round match of the French Open tennis tournament against Venus Williams of the US at the Roland Garros stadium, in Paris, France, Sunday, May 25, 2014. Bencic lost in two sets 4-6, 1-6. (AP Photo/David Vincent)
Venus Williams of the US serves the ball during the first round match of the French Open tennis tournament against Switzerland's Belinda Bencic at the Roland Garros stadium, in Paris, France, Sunday, May 25, 2014. (AP Photo/David Vincent)
Venus Williams of the US serves the ball during the first round match of the French Open tennis tournament against Switzerland's Belinda Bencic at the Roland Garros stadium, in Paris, France, Sunday, May 25, 2014. (AP Photo/David Vincent)
Venus Williams of the US serves the ball during the first round match of the French Open tennis tournament against Switzerland's Belinda Bencic at the Roland Garros stadium, in Paris, France, Sunday, May 25, 2014. (AP Photo/David Vincent)