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| Career Post-Season Winning Pct Leaderboard | |
| * - Indicates Hall of Fame Bold - Indicates active player |
| Rank | Player | Winning Pct | IP | Years | Single Season Leaderboard |
| 1. | Bill Landrum | 1.0000 | 56.3 | 1986-1990 | |
| Atlee Hammaker | 1.0000 | 13.3 | 1990-1990 | ||
| Bob Ojeda | 1.0000 | 32.7 | 1986-1987 | ||
| Phil Hennigan | 1.0000 | 44.3 | 1972-1982 | ||
| Ron Cook | 1.0000 | 27.3 | 1971-1981 | ||
| Hugh Mulcahy | 1.0000 | 71.3 | 1943-1949 | ||
| 7. | Tom Glavine | .8571 | 53.0 | 1988-1990 | |
| Hal Newhouser | .8571 | 70.0 | 1939-1942 | ||
| 9. | Bill Bonham | .8333 | 45.3 | 1973-1977 | |
| Mel Parnell | .8333 | 43.7 | 1948-1955 | ||
| Dutch Henry | .8333 | 59.3 | 1931-1933 | ||
| 12. | Joey McLaughlin | .8182 | 92.7 | 1983-1988 | |
| Wes Ferrell | .8182 | 74.3 | 1931-1937 | ||
| 14. | Dave Beard | .8000 | 41.7 | 1984-1990 | |
| Greg Minton | .8000 | 152.7 | 1976-1986 | ||
| Jim Beattie | .8000 | 49.7 | 1981-1983 | ||
| Pat Dobson | .8000 | 84.0 | 1967-1975 | ||
| Bob Logan | .8000 | 93.0 | 1941-1946 | ||
| Hugh Canavan | .8000 | 62.0 | 1930-1933 | ||
| 20. | Paul Dean * | .7826 | 209.0 | 1934-1945 | |
| 21. | Van Mungo | .7778 | 83.7 | 1932-1944 | |
| Carl Hubbell | .7778 | 90.7 | 1932-1939 | ||
| 23. | Ralph Terry | .7692 | 112.0 | 1957-1968 | |
| 24. | Leo Kiely | .7647 | 153.3 | 1953-1964 | |
| 25. | Mark Eichhorn | .7500 | 78.7 | 1985-1990 | |
| Steve Bedrosian | .7500 | 47.7 | 1988-1990 | ||
| Dave Meads | .7500 | 36.7 | 1988-1990 | ||
| Jamie Moyer | .7500 | 23.7 | 1988-1989 | ||
| Bo McLaughlin | .7500 | 44.7 | 1976-1987 | ||
| Al Fitzmorris | .7500 | 32.0 | 1976-1978 | ||
| John Morris | .7500 | 64.7 | 1969-1977 | ||
| Tom Qualters | .7500 | 145.3 | 1963-1971 | ||
| Diego Segui | .7500 | 24.3 | 1963-1969 | ||
| Moe Drabowsky | .7500 | 26.0 | 1960-1968 | ||
| Jackie Collum | .7500 | 86.0 | 1953-1963 | ||
| Harry Matuzak | .7500 | 46.7 | 1934-1941 | ||
| Bill Harris | .7500 | 67.3 | 1930-1933 | ||
| Joe Heving | .7500 | 42.7 | 1932-1932 | ||
| Ossie Orwoll | .7500 | 45.7 | 1930-1930 | ||
| 40. | John Hiller | .7407 | 238.3 | 1965-1978 | |
| 41. | Mike Torrez | .7368 | 175.0 | 1973-1983 | |
| 42. | Harry Brecheen | .7273 | 192.3 | 1942-1949 | |
| Hank Thormahlen | .7273 | 109.7 | 1930-1933 | ||
| 44. | Dave Laroche | .7143 | 86.0 | 1974-1983 | |
| Hal Reniff | .7143 | 200.3 | 1962-1977 | ||
| Bob Gibson | .7143 | 73.3 | 1961-1971 | ||
| Pat Malone | .7143 | 80.7 | 1932-1938 | ||
| 48. | Lance Rautzhan | .7000 | 175.3 | 1979-1990 | |
| Billy Pierce | .7000 | 85.0 | 1949-1961 | ||
| 50. | Juan Marichal * | .6957 | 228.6 | 1964-1972 |
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