U.S. Open 2011

Associated Press
FILE- In this  Sept. 7, 2009, file photo, Melanie Oudin, of the United States, reacts during her match against Nadia Petrova, of Russia, at the U.S. Open tennis tournament in New York. Oudin says her problems with her heart have returned, pushing back her start to the season.  Oudin, a surprise quarterfinalist at the 2009 U.S. Open at age 17, wrote Thursday on Twitter that she "will probably have to undergo another procedure" for a heart condition. (AP Photo/Amy Sancetta, File)

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The U.S. Open is underway in Flushing Meadows, New York.

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