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)
Italy's Simone Bolelli serves the ball to Spain's David Ferrer 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/Michel Euler)
Spain's David Ferrer serves the ball to Italy's Simone Bolelli 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/Michel Euler)
Spain's David Ferrer returns the ball to Italy's Simone Bolelli 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/Michel Euler)