Marion Anthony Trabert (August 16, 1930 – February 3, 2021) was an American amateur world No. 1 tennis champion and long-time tennis author, TV commentator, instructor, and motivational speaker.
Trabert was ranked world No. 1 amateur by many sources in 1953, by Ned Potter and The New York Times in 1954 and by Lance Tingay and Ned Potter in 1955. He was the winner of ten Grand Slam titles – five in singles and five in doubles. He won two French singles championships, two U.S. National Men's Singles Championships, and one Wimbledon gentlemen's singles championship. Until Michael Chang won the French Open in 1989, Trabert was the last American man to hoist the championship trophy. He turned professional in the fall of 1955. He won the French Professional Championships at Roland Garros in 1956 and 1959.