Billy Martin (born December 25, 1956, in Evanston, Illinois), is a former professional tennis player from the United States. During his career he won 1 singles titles and 3 doubles titles. He achieved a career-high singles ranking of World No. 32 in 1975.
| Outcome | No. | Date | Tournament | Surface | Opponents in the final | Score in the final |
|---|---|---|---|---|---|---|
| Runner-up | 1. | 1975 | Birmingham, U.S. | Carpet | Jimmy Connors | 4–6, 3–6 |
| Winner | 1. | 1975 | Little Rock, U.S. | Carpet | George Hardie | 6–2, 7–6 |
| Outcome | No. | Date | Tournament | Surface | Partner | Opponents in the final | Score in the final |
|---|---|---|---|---|---|---|---|
| Runner-up | 1. | 1976 | Denver WCT, U.S. | Carpet | Jimmy Connors | John Fitzgerald Phil Dent |
7–6, 2–6, 5–7 |
| Runner-up | 2. | 1977 | Birmingham WCT, U.S. | Carpet | Bill Scanlon | Wojtek Fibak Tom Okker |
3–6, 4–6 |
| Runner-up | 3. | 1977 | Monterrey WCT, Mexico | Carpet | Bill Scanlon | Ross Case Wojtek Fibak |
6–3, 3–6, 4–6 |
| Winner | 1. | 1977 | Laguna Niguel, U.S. | Hard | James Chico Hagey | Peter Fleming Trey Waltke |
6–3, 6–4 |
| Winner | 2. | 1979 | Brussels, Belgium | Clay | Peter McNamara | Carlos Kirmayr Balázs Taróczy |
5–7, 7–5, 6–4 |
| Winner | 3. | 1981 | Bristol, England | Grass | Russell Simpson | John Austin Johan Kriek |
6–3, 4–6, 6–4 |
| Runner-up | 4. | 1981 | Newport, U.S. | Grass | Kevin Curren | Brad Drewett Erik Van Dillen |
2–6, 4–6 |
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