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Medical personnel assist Peng Shuai, of China, gets into a wheel chair in pain with a cramp during the semifinals of the 2014 U.S. Open tennis tournament against Caroline Wozniacki, of Denmark, Friday, Sept. 5, 2014, in New York. Peng left the court and retired from the game, forfeiting it to Wozniacki. (AP Photo/Mike Groll)