U.S. Open 2011

Associated Press
FILE - This Sept. 12, 2011 file photo shows Rafael Nadal of Spain returning a shot to Novak Djokovic of Serbia during the men's championship match at the U.S. Open tennis tournament in New York. The U.S. Open says that Nadal has withdrawn from the last Grand Slam tennis tournament of the year because of injury. (AP Photo/Charles Krupa, FIle)

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

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