Roger Federer (born 8 August 1981) is a Swiss professional tennis player who as of December 2012 is ranked world No. 2 by the ATP. Many sports analysts, tennis critics and former and current players consider Federer the greatest tennis player of all time. He owns several men's world records of the Open Era: holding the world no. 1 position for 302 weeks overall; a 237-consecutive-week stretch at the top from 2004 to 2008; winning 17 Grand Slam singles titles; reaching the finals of each Grand Slam tournament at least five times (an all-time record); and reaching the Wimbledon final eight times. He is one of seven men, and one of four in the Open Era, to capture the career Grand Slam, and one of three (with Andre Agassi and Rafael Nadal) to do so separately on clay, grass, and hard courts. Federer also shares the Open Era record for most Grand Slam titles at the Australian Open with Agassi and Novak Djokovic (4 titles), at Wimbledon with Pete Sampras (7 titles) and at the US Open with Jimmy Connors and Sampras (5 titles). Federer's ATP tournament records include winning six ATP World Tour Finals, winning 21 ATP Masters 1000 titles (a record shared with Nadal), playing in the finals at all nine ATP Masters 1000 tournaments (a record shared with Djokovic), and being one of three players (alongside Agassi and Djokovic) to win seven.