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| Career Post-Season ERA Leaderboard | |
| * - Indicates Hall of Fame Bold - Indicates active player |
| Rank | Player | ERA | IP | Years | Single Season Leaderboard |
| 1. | Ron Cook | 0.989 | 27.3 | 1971-1981 | |
| 2. | Virgil Jester | 1.436 | 31.3 | 1961-1961 | |
| 3. | Don Stanhouse | 1.468 | 30.7 | 1978-1985 | |
| 4. | Joey McLaughlin | 1.749 | 92.7 | 1983-1988 | |
| 5. | Bud Daley | 1.821 | 29.7 | 1965-1965 | |
| 6. | Dan Quisenberry | 1.890 | 33.3 | 1980-1983 | |
| 7. | Bob Ojeda | 1.929 | 32.7 | 1986-1987 | |
| 8. | Bill Stafford | 1.958 | 23.0 | 1965-1971 | |
| 9. | Rob Gardner | 1.982 | 36.3 | 1970-1977 | |
| 10. | Moe Drabowsky | 2.079 | 26.0 | 1960-1968 | |
| 11. | Don Cardwell | 2.104 | 25.7 | 1960-1965 | |
| 12. | Lance Rautzhan | 2.156 | 175.3 | 1979-1990 | |
| 13. | Ken Dayley | 2.209 | 36.7 | 1986-1987 | |
| 14. | Danny Frisella | 2.214 | 40.7 | 1968-1979 | |
| 15. | Dave Geisel | 2.217 | 44.7 | 1982-1987 | |
| 16. | Diego Segui | 2.220 | 24.3 | 1963-1969 | |
| 17. | Denny McLain | 2.269 | 39.7 | 1972-1974 | |
| 18. | Dave Wehrmeister | 2.316 | 23.3 | 1982-1986 | |
| 19. | Ken Raffensberger | 2.348 | 23.0 | 1943-1943 | |
| 20. | John Morris | 2.367 | 64.7 | 1969-1977 | |
| 21. | Al Benton | 2.383 | 22.7 | 1934-1940 | |
| 22. | Allan Anderson | 2.394 | 26.3 | 1988-1990 | |
| 23. | Bob Rush | 2.455 | 55.0 | 1948-1954 | |
| 24. | Paul Foytack | 2.501 | 72.0 | 1955-1965 | |
| 25. | John Hiller | 2.531 | 238.3 | 1965-1978 | |
| 26. | Syd Cohen | 2.533 | 21.3 | 1934-1940 | |
| 27. | Bill Dailey | 2.573 | 35.0 | 1962-1970 | |
| 28. | Dutch Henry | 2.579 | 59.3 | 1931-1933 | |
| 29. | Wilcy Moore | 2.585 | 31.3 | 1930-1932 | |
| 30. | Tom Qualters | 2.601 | 145.3 | 1963-1971 | |
| 31. | Jackie Collum | 2.617 | 86.0 | 1953-1963 | |
| 32. | Juan Marichal * | 2.637 | 228.6 | 1964-1972 | |
| 33. | Randy O'Neal | 2.642 | 30.7 | 1985-1990 | |
| 34. | Ramon Monzant | 2.665 | 101.3 | 1958-1963 | |
| 35. | Paul Dean * | 2.670 | 209.0 | 1934-1945 | |
| 36. | Max Lanier | 2.691 | 93.7 | 1945-1949 | |
| 37. | Bob Logan | 2.710 | 93.0 | 1941-1946 | |
| 38. | Tom Glavine | 2.717 | 53.0 | 1988-1990 | |
| 39. | Ron Perranoski | 2.719 | 53.0 | 1964-1969 | |
| 40. | Roy Thomas | 2.735 | 26.3 | 1982-1982 | |
| 41. | Gary Peters | 2.770 | 243.7 | 1962-1971 | |
| 42. | Steve Ontiveros | 2.843 | 44.3 | 1986-1990 | |
| 43. | Todd Frohwirth | 2.844 | 25.3 | 1988-1990 | |
| 44. | Don Drysdale | 2.911 | 123.7 | 1963-1969 | |
| 45. | Charlie Williams | 2.964 | 27.3 | 1972-1976 | |
| 46. | Dave Smith | 2.968 | 30.3 | 1982-1989 | |
| 47. | Rollie Sheldon | 2.985 | 259.3 | 1965-1971 | |
| 48. | Hub Pruett | 3.000 | 126.0 | 1931-1939 | |
| 49. | Jack Spring | 3.001 | 21.0 | 1962-1967 | |
| 50. | Hal Reniff | 3.010 | 200.3 | 1962-1977 |
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