Billie Jean King (November 22, 1943) is an American former world No. 1 tennis player.
Billie Jean King has won 12 Grand Slams.
Singles: 18 (12 titles, 6 runners-up)
| Outcome | Year | Championship | Opponent | Score |
|---|---|---|---|---|
| Runner-up | 1963 | Wimbledon | Margaret Court | 3–6, 4–6 |
| Runner-up | 1965 | U.S. Championships | Margaret Court | 6–8, 5–7 |
| Winner | 1966 | Wimbledon | Maria Bueno | 6–3, 3–6, 6–1 |
| Winner | 1967 | Wimbledon (2) | Ann Haydon-Jones | 6–3, 6–4 |
| Winner | 1967 | U.S. Championships | Ann Haydon-Jones | 11–9, 6–4 |
| Winner | 1968 | Australian Championships | Margaret Court | 6–1, 6–2 |
| ↓ Open Era ↓ (8 titles, 4 runners-up) | ||||
| Winner | 1968 | Wimbledon (3) | Judy Tegart-Dalton | 9–7, 7–5 |
| Runner-up | 1968 | US Open | Virginia Wade | 4–6, 2–6 |
| Runner-up | 1969 | Australian Open | Margaret Court | 4–6, 1–6 |
| Runner-up | 1969 | Wimbledon | Ann Haydon-Jones | 6–3, 3–6, 2–6 |
| Runner-up | 1970 | Wimbledon | Margaret Court | 12–14, 9–11 |
| Winner | 1971 | US Open (2) | Rosemary Casals | 6–4, 7–6 |
| Winner | 1972 | French Open | Evonne Goolagong Cawley | 6–3, 6–3 |
| Winner | 1972 | Wimbledon (4) | Evonne Goolagong Cawley | 6–3, 6–3 |
| Winner | 1972 | US Open (3) | Kerry Melville Reid | 6–3, 7–5 |
| Winner | 1973 | Wimbledon (5) | Chris Evert | 6–0, 7–5 |
| Winner | 1974 | US Open (4) | Evonne Goolagong Cawley | 3–6, 6–3, 7–5 |
| Winner | 1975 | Wimbledon (6) | Evonne Goolagong Cawley | 6–0, 6–1 |