Austria's Dominic Thiem returns the ball to Spain's Rafael Nadal 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/Darko Vojinovic)
Austria's Dominic Thiem returns the ball during the second round match of the French Open tennis tournament against Spain's Rafael Nadal at the Roland Garros stadium, in Paris, France, Thursday, May 29, 2014. (AP Photo/Darko Vojinovic)
France's Jo-Wilfried Tsonga returns the ball to Austria's Jurgen Melzer during the 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)