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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 20 Grand Slam singles titles—the most in history for a male player—and has held the world No. 1 spot in the ATP rankings for a record total of 310 weeks, including a record 237 consecutive weeks. After turning professional in 1998, he was continuously ranked in the top ten from October 2002 to November 2016. He re-entered the top ten following his victory at the 2017 Australian Open.