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| Career ERA Leaderboard | |
| * - Indicates Hall of Fame Bold - Indicates active player |
| Rank | Player | ERA | IP | Years | Single Season Leaderboard |
| 1. | Robert Lerman | 3.140 | 1095.0 | 1947-1950 | |
| 2. | Domingo Contreras | 3.233 | 1069.0 | 1947-1950 | |
| 3. | Lucien Pillar | 3.360 | 1082.0 | 1947-1950 | |
| 4. | James Hanselman | 3.555 | 1038.0 | 1947-1950 | |
| 5. | Joseph Hale | 3.558 | 1103.0 | 1947-1950 | |
| 6. | Dwight Roesch | 3.720 | 1033.0 | 1947-1950 | |
| 7. | Stephen McMaster | 3.819 | 1046.3 | 1947-1950 | |
| 8. | Gerald Sarno | 3.861 | 1053.6 | 1947-1950 | |
| 9. | Marvin Shope | 3.866 | 1008.0 | 1947-1950 | |
| 10. | Daniel Elliott | 4.394 | 1057.0 | 1947-1950 | |
| 11. | Tommie Guernsey | 4.470 | 1039.0 | 1947-1950 |
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