Roger Federer (born 8 August 1981) is a Swiss professional tennis player who is currently ranked world No. 3 in men's singles tennis by the Association of Tennis Professionals (ATP). He has won 19 Grand Slam singles titles, the most in history for a male tennis player. He has held the world No. 1 spot in the ATP rankings for a record total of 302 weeks and was ranked No. 1 for a record 237 consecutive weeks. Federer turned professional in 1998 and was continuously ranked in the top ten from October 2002 to November 2016.