Serbia's Novak Djokovic returns the ball to Germany's Tommy Haas during their quarterfinal match of the French Open tennis tournament at the Roland Garros stadium Wednesday, June 5, 2013 in Paris. (AP Photo/Michel Euler)

Associated Press
Serbia's Novak Djokovic returns the ball to Germany's Tommy Haas during their quarterfinal match of the French Open tennis tournament at the Roland Garros stadium Wednesday, June 5, 2013 in Paris. (AP Photo/Michel Euler)
Serbia's Novak Djokovic returns the ball to Germany's Tommy Haas during their quarterfinal match of the French Open tennis tournament at the Roland Garros stadium Wednesday, June 5, 2013 in Paris. (AP Photo/Michel Euler)
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