The French Open

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Serbia's Novak Djokovic returns the ball during the first round match of the French Open tennis tournament against Portugal's Joao Sousa at the Roland Garros stadium, in Paris, France, Monday, May 26, 2014. (AP Photo/Michel Euler)

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Serbia's Novak Djokovic returns the ball during the first round match of the French Open tennis tournament against Portugal's Joao Sousa at the Roland Garros stadium, in Paris, France, Monday, May 26, 2014. (AP Photo/Michel Euler)

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Serbia's Novak Djokovic eyes the ball as he returns during the first round match of the French Open tennis tournament against Portugal's Joao Sousa at the Roland Garros stadium, in Paris, France, Monday, May 26, 2014. (AP Photo/Michel Euler)

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Serbia's Novak Djokovic, left, talks to a ball boy after inviting him to sit on his bench during a break during the first round match of the French Open tennis tournament against Portugal's Joao Sousa at the Roland Garros stadium, in Paris, France, Monday, May 26, 2014. (AP Photo/Michel Euler)