Germany's Tommy Haas grimaces as he returns during the first round match of the French Open tennis tournament against Estonia's Jurgen Zopp at the Roland Garros stadium, in Paris, France, Tuesday, May 27, 2014. Haas was forced to retire with a right shoulder injury. (AP Photo/Darko Vojinovic)

France Tennis French Open

Germany's Tommy Haas grimaces as he returns during the first round match of the French Open tennis tournament against Estonia's Jurgen Zopp at the Roland Garros stadium, in Paris, France, Tuesday, May 27, 2014. Haas was forced to retire with a right shoulder injury. (AP Photo/Darko Vojinovic)

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