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NEW YORK - MARCH 10: Roger Federer of Switzerland faces Grigor Dimitrov of Bulgaria during the BNP Paribas Showdown at Madison Square Garden on March 10, 2015 in New York City. (Photo by Rich Schultz /Getty Images)

NEW YORK - MARCH 10: Roger Federer of Switzerland faces Grigor Dimitrov of Bulgaria during the BNP Paribas Showdown at Madison Square Garden on March 10, 2015 in New York City. (Photo by Rich Schultz /Getty Images)