Roger Federer, of Switzerland, returns a shot to Grega Zemlja, of Slovenia, during the first round of the 2013 U.S. Open tennis tournament Tuesday, Aug. 27, 2013, in New York. (AP Photo/Mike Groll)
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Roger Federer, of Switzerland, returns a shot to Grega Zemlja, of Slovenia, during the first round of the 2013 U.S. Open tennis tournament Tuesday, Aug. 27, 2013, in New York. (AP Photo/Mike Groll)
