Germany's Andrea Petkovic returns the ball to Switzerland's Stefanie Voegele during their second round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Thursday, May 29, 2014. (AP Photo/David Vincent)
Germany's Andrea Petkovic returns the ball to Switzerland's Stefanie Voegele during their second round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Thursday, May 29, 2014. (AP Photo/David Vincent)