U.S. Open 2011

Associated Press
FILE - In this Sept. 6, 2013, file photo, Li Na, of China, returns a shot to Serena Williams during the semifinals of the U.S. Open tennis tournament in New York. Li formally announced her retirement on Friday, Sept. 19, 2014. (AP Photo/David Goldman, File)

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

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