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NEW YORK, NY - AUGUST 23: (L-R) Novak Djokovic, Rafael Nadal, and Roger Federer attend the ATP Heritage Celebration at The Waldorf=Astoria on August 23, 2013 in New York City. (Photo by D Dipasupil/Getty Images)

NEW YORK, NY - AUGUST 23:  (L-R) Novak Djokovic, Rafael Nadal, and Roger Federer attend the ATP Heritage Celebration at The Waldorf=Astoria on August 23, 2013 in New York City.  (Photo by D Dipasupil/Getty Images)