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Singer Gwen Stefani applauds during a match between Roger Federer, of Switzerland, and Gael Monfils, of France, in the quarterfinals of the U.S. Open tennis tournament, Thursday, Sept. 4, 2014, in New York. Federer defeated Monfils 4-6, 3-6, 6-4, 7-5, 6-2. (AP Photo/Charles Krupa)