France's Jeremy Chardy returns the ball to Serbia's Novak Djokovic during their second round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Wednesday, May 28, 2014. (AP Photo/David Vincent)
Serbia's Novak Djokovic returns the ball to France's Jeremy Chardy during their second round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Wednesday, May 28, 2014. (AP Photo/David Vincent)
Serbia's Novak Djokovic returns the ball to France's Jeremy Chardy during their second round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Wednesday, May 28, 2014. (AP Photo/David Vincent)
Serbia's Anna Ivanovic returns the ball during the first round match of the French Open tennis tournament against France's Caroline Garcia at the Roland Garros stadium, in Paris, France, Tuesday, May 27, 2014. (AP Photo/Michel Spingler)
Serbia's Jelena Jankovic returns the ball to Canada's Sharon Fichman during the first round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Tuesday, May 27, 2014. (AP Photo/Michel Euler)