U.S. Open 2011

Associated Press
FILE - In this Sept. 9, 2014 file photo,  U.S. Open 2014 tennis champion Serena Williams, left, poses with U.S. Open runner-up Caroline Wozniacki before showing her Spring 2015 collection during Fashion Week in New York.   In their latest public display of friendship, Williams and Wozniacki posted a photo of getting their nails done before the Australian Open. The camaraderie, in a sport better known for its rivalries, has prompted discussion among players on what it's like in the locker room and behind-the-scenes with top tennis stars. (AP Photo/Bebeto Matthews, File)

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

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