The east Cobb standout has written on her Twitter feed that her “off season is a little paused at the moment” because of the ailment, called rhabdomyolysis, and she is “doing everything possible for a speedy” recovery.
Her agent, Sam Duvall, confirms that Oudin sent the tweets.
Heavy exertion can cause muscle cells to leak enzymes and protein into the blood. Symptoms of rhabdomyolysis can include muscle pain and severe cases can lead to kidney damage.
Oudin, who turned 22 in September, is ranked 129th.
During the summer of 2009 at 17, she pulled off a series of upsets.
Oudin stunned former No. 1 Jelena Jankovic in three sets en route to a fourth round showing at Wimbledon. Her success carried over into the U.S. Open when she upset three Russian standout, all coming in three sets, to become the youngest player since Serena Williams in 1999 to make the U.S. open quarterfinals.
Her first upset victory at Flushing Meadow came against Olympic gold medalist Elena Dementieva in the second round before shocking the world with a three-set win over former No. 1 and grand slam champion Maria Sharapova. She followed up with victory over No. 13 seed Nadia Petrova in the Round of 16.
Oudin’s rise to stardom put her in the top 50 at the end of the 2009 calendar year but hasn’t been able to match that success in the years that followed.
She struggled in singles play and watched her ranking fall to 370 by the spring of 2012.
She did have a few highlights, however, that included a 2011 U.S. Open mixed doubles title with Jack Sock and her first WTA singles title at Birmingham in the summer of 2012 with a straight-set win over Jankovic.