William Tatem Tilden II (February 10, 1893 – June 5, 1953), nicknamed "Big Bill", was an American tennis player. He was the world No. 1 amateur for six consecutive years, from 1920 to 1925, and was ranked as the world No. 1 professional by Ray Bowers in 1931 and 1932 and Ellsworth Vines in 1933. Tilden won 14 Major singles titles, including 10 Grand Slam events, one World Hard Court Championships and three professional majors. He was the first American man to win Wimbledon, first claiming the title in 1920. He also won a joint-record seven U.S. Championships titles (shared with Richard Sears and Bill Larned).
Tilden dominated the world of international tennis in the first half of the 1920s, and during his 20-year amateur period from 1911 to 1930, won 138 of 192 tournaments he contested. He owns a number of all-time tennis achievements, including the career match-winning record and the career winning percentage at the U.S. Championships. At the 1929 U.S. National Championships, Tilden became the first player to reach ten finals at the same Grand Slam event.