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)