Gulbis, Djokovic, Nadal and Murray in the men's semi-finals
Novak Djokovic of Serbia eyes the ball during his men's semi-final match against Ernests Gulbis of Latvia at the French Open tennis tournament at the Roland Garros stadium in Paris June 6, 2014.STEPHANE MAHE/Reuters
Serbia's Novak Djokovic serves the ball during the semi-final match of the French Open tennis tournament against Latvia's Ernests Gulbis at the Roland Garros stadium, in Paris, France, Friday, June 6, 2014.Michel Spingler/The Associated Press
Ernests Gulbis of Latvia serves to Novak Djokovic of Serbia during their men's semi-final match at the French Open tennis tournament at the Roland Garros stadium in Paris June 6, 2014.GONZALO FUENTES/Reuters
Novak Djokovic of Serbia serves to Ernests Gulbis of Latvia during their men's semi-final match at the French Open tennis tournament at the Roland Garros stadium in Paris June 6, 2014.GONZALO FUENTES/Reuters
Referee Carlos Ramos of Portugal, right, watches Latvia's Ernests Gulbis, left, return the ball during the semi-final match of the French Open tennis tournament against Serbia's Novak Djokovic at the Roland Garros stadium, in Paris, France, Friday, June 6, 2014.Michel Spingler/The Associated Press
Ernests Gulbis of Latvia returns the ball to Novak Djokovic of Serbia during their men's semi-final match at the French Open tennis tournament at the Roland Garros stadium in Paris June 6, 2014.GONZALO FUENTES/Reuters
Novak Djokovic of Serbia casts his shadow as he serves to Ernests Gulbis of Latvia during their men's semi-final match at the French Open tennis tournament at the Roland Garros stadium in Paris June 6, 2014.JEAN-PAUL PELISSIER/Reuters
Novak Djokovic of Serbia returns the ball to Ernests Gulbis of Latvia during their men's semi-final match at the French Open tennis tournament at the Roland Garros stadium in Paris June 6, 2014. Picture taken with zoom-out effect.STEPHANE MAHE/Reuters
Latvia's Ernests Gulbis returns the ball during the semi-final match of the French Open tennis tournament against Serbia's Novak Djokovic at the Roland Garros stadium, in Paris, France, Friday, June 6, 2014.Darko Vojinovic/The Associated Press
Serbia's Novak Djokovic picks up his racket after throwing it on the court during the semi-final match of the French Open tennis tournament against Latvia's Ernests Gulbis at the Roland Garros stadium, in Paris, France, Friday, June 6, 2014.Darko Vojinovic/The Associated Press
Ernests Gulbis of Latvia covers his head with a towel during his men's semi-final match against Novak Djokovic of Serbia at the French Open tennis tournament at the Roland Garros stadium in Paris June 6, 2014.VINCENT KESSLER/Reuters
Latvia's Ernests Gulbis returns the ball during the semi-final match of the French Open tennis tournament against Serbia's Novak Djokovic at the Roland Garros stadium, in Paris, France, Friday, June 6, 2014.David Vincent/The Associated Press
A view shows glass windows reflecting spectators and Philippe Chatrier Court during the men's semi-final match between Novak Djokovic of Serbia and Ernests Gulbis of Latvia at the French Open tennis tournament at the Roland Garros stadium in Paris June 6, 2014.STEPHANE MAHE/Reuters
Serbia's Novak Djokovic screams before smashing his racket during the semi-final match of the French Open tennis tournament against Serbia's Novak Djokovic at the Roland Garros stadium, in Paris, France, Friday, June 6, 2014.Michel Euler/The Associated Press
Novak Djokovic of Serbia reacts during his men's semi-final match against Ernests Gulbis of Latvia at the French Open tennis tournament at the Roland Garros stadium in Paris June 6, 2014.JEAN-PAUL PELISSIER/Reuters
Yui Kamiji of Japan serves to Aniek van Koot of the Netherlands during their wheelchair tennis women's final match at the French Open Tennis tournament at the Roland Garros stadium in Paris June 6, 2014.GONZALO FUENTES/Reuters
Shingo Kunieda of Japan returns the ball to Stephane Houdet of France during their wheelchair tennis men's final match against at the French Open Tennis tournament at the Roland Garros stadium in Paris June 6, 2014.STEPHANE MAHE/Reuters
Serbia's Novak Djokovic picks up the racket he smashed on the court during the semi-final match of the French Open tennis tournament against Latvia's Ernests Gulbis at the Roland Garros stadium, in Paris, France, Friday, June 6, 2014.Darko Vojinovic/The Associated Press
Britain's Andy Murray returns the ball to Spain's Rafael Nadal during their semi-final match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Friday, June 6, 2014.Michel Euler/The Associated Press
Rafael Nadal of Spain returns the ball to Andy Murray of Britain during their men's semi-final match at the French Open tennis tournament at the Roland Garros stadium in Paris June 6, 2014.JEAN-PAUL PELISSIER/Reuters
Britain's Andy Murray returns the ball to Spain's Rafael Nadal during their semi-final match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Friday, June 6, 2014.Michel Spingler/The Associated Press
Spain's Rafael Nadal returns the ball to Britain's Andy Murray during their semi-final match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Friday, June 6, 2014.Michel Spingler/The Associated Press
Britain's Andy Murray walks back to his chair for a break as he plays Spain's Rafael Nadal during their semi-final match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Friday, June 6, 2014.David Vincent/The Associated Press
Rafael Nadal of Spain celebrates after winning his men's semi-final match against Andy Murray of Britain at the French Open tennis tournament at the Roland Garros stadium in Paris June 6, 2014.JEAN-PAUL PELISSIER/Reuters
A general view shows the Philippe Chatrier court during the men's semi-final match between Andy Murray of Britain and Rafael Nadal of Spain at the French Open tennis tournament at the Roland Garros stadium in Paris June 6, 2014.STEPHANE MAHE/Reuters