Roger Federer (born 8 August 1981) is a Swiss professional tennis player. As of the 6th of July 2009, he is ranked world number 1 by the Association of Tennis Professionals (ATP), having previously held the number one position for a record 237 consecutive weeks. Many sports analysts, tennis critics, and former and current players consider Federer to be the greatest tennis player of all time.

Federer has won 15 Grand Slam singles titles, more than any other male player. He is one of six male players to have captured the career Grand Slam. Federer has appeared in an unprecedented 21 career Grand Slam finals, and as of September 2009, has reached the semi-finals or better of the last 22 Grand Slam tournaments, a streak that spans over five years. Federer also holds the record of reaching 10 consecutive Grand Slam finals and has appeared in 17 of the last 18. As a result of his successes in tennis, Federer was named the Laureus World Sportsman of the Year for four consecutive years (2005–2008).

Federer was born in Binningen, near Basel, to Swiss national Robert Federer and South Africa-born Lynette Du Rand. He holds both Swiss and South African citizenship. He grew up in suburban Münchenstein, near Basel, close to the French-German borders and Federer speaks Swiss German, German, French and English fluently. He was raised as a Catholic and met Pope Benedict XVI while playing the 2006 Internazionali BNL d'Italia tournament in Rome. Like all male Swiss citizens, Federer was subject to compulsory military service in the Swiss Armed Forces. However, in 2003 he was deemed unfit due to a long-standing back problem and was subsequently not required to fulfill his obligations.