Roger Federer of Switzerland returns a shot to Marin Cilic of Croatia during the U.S. Open tennis tournament in New York, Saturday, Sept. 3, 2011. (AP Photo/Mike Groll)

Associated Press
Roger Federer of Switzerland returns a shot to Marin Cilic of Croatia during the U.S. Open tennis tournament in New York, Saturday, Sept. 3, 2011. (AP Photo/Mike Groll)
Roger Federer of Switzerland returns a shot to Marin Cilic of Croatia during the U.S. Open tennis tournament in New York, Saturday, Sept. 3, 2011. (AP Photo/Mike Groll)
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