Croatia's Ivo Karlovic returns the ball during the first round match of the French Open tennis tournament against Bulgaria's Grigor Dimitrov at the Roland Garros stadium, in Paris, France, Tuesday, May 27, 2014. (AP Photo/Michel Spingler)

France Tennis French Open

Croatia's Ivo Karlovic returns the ball during the first round match of the French Open tennis tournament against Bulgaria's Grigor Dimitrov at the Roland Garros stadium, in Paris, France, Tuesday, May 27, 2014. (AP Photo/Michel Spingler)

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