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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. | Bob Black | 0.692 | 26.0 | 1884-1884 | |
| 2. | Fred Goldsmith | 2.000 | 27.0 | 1884-1884 | |
| 3. | Lady Baldwin | 2.667 | 27.0 | 1884-1884 | |
| 4. | James Burke | 2.893 | 28.0 | 1884-1884 | |
| 5. | Sam Weaver | 3.000 | 33.0 | 1884-1884 | |
| 6. | Guy Hecker | 4.750 | 36.0 | 1884-1884 |
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