FILE - In this June 24, 2013 file photo, Melanie Oudin of the United States returns to Michelle Larcher De Brito of Portugal during their Women's first round singles match at the All England Lawn Tennis Championships in Wimbledon, London. Oudin says she has a muscle-damaging condition that may be caused by intense exertion. Oudin has written on her Twitter feed that her "off season is a little paused at the moment" because of the ailment, called rhabdomyolysis. Her agent, Sam Duvall, confirms to The Associated Press on Monday, Nov. 25, 2013, that Oudin sent the tweets. (AP Photo/Alastair Grant, File)

Oudin Muscle Condition Tennis

FILE - In this June 24, 2013 file photo, Melanie Oudin of the United States returns to Michelle Larcher De Brito of Portugal during their Women's first round singles match at the All England Lawn Tennis Championships in Wimbledon, London. Oudin says she has a muscle-damaging condition that may be caused by intense exertion. Oudin has written on her Twitter feed that her "off season is a little paused at the moment" because of the ailment, called rhabdomyolysis. Her agent, Sam Duvall, confirms to The Associated Press on Monday, Nov. 25, 2013, that Oudin sent the tweets. (AP Photo/Alastair Grant, File)

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