Former tennis champion John McEnroe (R) plays with Serbian tennis player Novak Djokovic, during day eight of the 2009 US Open at the USTA Billie Jean King National Tennis Center, in New York, September 7, 2009. Getty Images logo Getty Images 2 months ago

Former tennis champion John McEnroe (R) plays with Serbian tennis player Novak Djokovic, during day eight of the 2009 US Open at the USTA Billie Jean King National Tennis Center, in New York, September 7, 2009.