FILE - In this Sept. 9, 2011 file photo, Melanie Oudin smiles after winning the mixed doubles final at the U.S. Open tennis tournament in New York, with partner Jack Sock. 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/Matt Slocum, File)

Oudin Muscle Condition Tennis

FILE - In this Sept. 9, 2011 file photo, Melanie Oudin smiles after winning the mixed doubles final at the U.S. Open tennis tournament in New York, with partner Jack Sock. 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/Matt Slocum, File)

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