Surprise 2009 US Open quarterfinalist Melanie Oudin says she is retiring from tennis at age 25.
Oudin says in a series of posts on Twitter on Friday that ''numerous health issues and injuries'' over the years have ''taken a toll on me mentally and physically.''
Oudin, who is from Marietta, Georgia, was 17 when she made a captivating run to the final eight at Flushing Meadows with a series of upsets, including against Maria Sharapova.
Oudin has been ranked as high as 31st but is now outside the top 400. She hasn't played a professional match this season.
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