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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. | James Nickerson | 1.731 | 26.0 | 1948-1949 | |
| 2. | Casey Stutzman | 1.818 | 34.7 | 1947-1950 | |
| 3. | Stan Lugo | 2.235 | 48.3 | 1947-1949 | |
| 4. | James Hanselman | 2.435 | 85.0 | 1947-1950 | |
| 5. | Edwin Dummer | 2.522 | 25.0 | 1947-1949 | |
| 6. | Lucien Pillar | 3.841 | 82.0 | 1947-1950 | |
| 7. | Eric Brown | 4.000 | 27.0 | 1947-1948 | |
| 8. | Lavern Bessler | 4.553 | 57.3 | 1947-1950 | |
| 9. | William Noriega | 4.555 | 27.7 | 1947-1950 | |
| 10. | Gerald Sarno | 4.593 | 49.0 | 1948-1949 | |
| 11. | Roger Kirwan | 4.766 | 62.3 | 1947-1950 | |
| 12. | Dwight Roesch | 4.971 | 67.0 | 1947-1949 | |
| 13. | Joshua Cook | 5.245 | 34.3 | 1947-1950 | |
| 14. | Chet Seiler | 5.284 | 46.0 | 1947-1950 | |
| 15. | Corey Hill | 5.401 | 45.0 | 1947-1950 | |
| 16. | James Wells | 5.569 | 32.3 | 1947-1949 | |
| 17. | Michael Edwards | 5.963 | 25.7 | 1947-1949 |
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