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| Career Post-Season OSLG Leaderboard | |
| * - Indicates Hall of Fame Bold - Indicates active player |
| Rank | Player | OSLG | IP | Years | Single Season Leaderboard |
| 1. | James Nickerson | .2553 | 26.0 | 1948-1949 | |
| 2. | Stan Lugo | .2759 | 48.3 | 1947-1949 | |
| 3. | Edwin Dummer | .2796 | 25.0 | 1947-1949 | |
| 4. | James Hanselman | .2993 | 85.0 | 1947-1950 | |
| 5. | Casey Stutzman | .3284 | 34.7 | 1947-1950 | |
| 6. | Lucien Pillar | .3365 | 82.0 | 1947-1950 | |
| 7. | Eric Brown | .3495 | 27.0 | 1947-1948 | |
| 8. | Chet Seiler | .3636 | 46.0 | 1947-1950 | |
| 9. | Gerald Sarno | .3743 | 49.0 | 1948-1949 | |
| 10. | Roger Kirwan | .3820 | 62.3 | 1947-1950 | |
| 11. | Dwight Roesch | .3831 | 67.0 | 1947-1949 | |
| 12. | Joshua Cook | .4254 | 34.3 | 1947-1950 | |
| 13. | William Noriega | .4393 | 27.7 | 1947-1950 | |
| 14. | Corey Hill | .4481 | 45.0 | 1947-1950 | |
| 15. | Lavern Bessler | .4601 | 57.3 | 1947-1950 | |
| 16. | James Wells | .4737 | 32.3 | 1947-1949 | |
| 17. | Michael Edwards | .4757 | 25.7 | 1947-1949 |
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