John Letts (born May 11, 1964, in Houston, Texas), is a former professional tennis player from the United States. He enjoyed most of his tennis success while playing doubles. During his career he won seven ATP tour doubles titles and reached four ATP tour doubles finals. He also reached the quarterfinals of the 1985 Australian Open in doubles knocking out the 3rd seeded team of Tomáš Šmíd and John Fitzgerald in the second round.
He reached a high of #244 in the world in singles achieving most of his success on the Challenger tour including the semi-finals of Manchester (1989) and San Luis Potosí (1988) and the quarterfinals of Nagoya (1988) and Dublin (1989). In Grand Slam singles, he reached the second round of 1987 Australian open before losing to eventual champion Stefan Edberg in four sets. He played the opening match on the Grand Stand court at the new Australian Open facility in 1988 at Melbourne park losing to Australian Mark Woodbridge in 3 sets.
The 1982 U.S. National Champion for boys 18 & under, Letts received a full scholarship to Stanford University where he was a two time All-American and member of two NCAA championship teams. At Stanford, he partnered with three doubles players who later reached the top five in the world: Scott Davis, Jim Grabb, and Patrick McEnroe.
He currently owns & operates iTennis, Inc. a tennis training and management company in Southern California.
| Outcome | No. | Date | Tournament | Surface | Partner | Opponents in the final | Score in the final |
|---|---|---|---|---|---|---|---|
| Winner | 1. | 1986 | Tel Aviv, Israel | Hard | Peter Lundgren | Christo Steyn Danie Visser |
6–3, 3–6, 6–3 |
| Runner-up | 1. | 1989 | Auckland, New Zealand | Hard | Bruce Man Son Hing | Steve Guy Shuzo Matsuoka |
6–7, 6–7 |
| Runner-up | 2. | 1989 | Seoul, South Korea | Hard | Bruce Man Son Hing | Scott Davis Paul Wekesa |
2–6, 4–6 |
| Runner-up | 3. | 1991 | Wellington, New Zealand | Hard | Jaime Oncins | Luiz Mattar Nicolás Pereira |
6–4, 6–7, 2–6 |