Roger Federer (born 8 August 1981) is a Swiss professional tennis player who is currently ranked world No. 9 by the Association of Tennis Professionals (ATP). Many players and analysts have called him the greatest tennis player of all time. In 2016, he was ranked by ESPN as the greatest male or female tennis player to ever live. Federer turned professional in 1998 and was continuously ranked in the top 10 from October 2002 to November 2016. After his victory over Rafael Nadal in the 2017 Australian Open Final, John McEnroe concluded that "Federer cemented himself as the greatest player of all time".