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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. | Bob Black | .1848 | 26.0 | 1884-1884 | |
| 2. | Fred Goldsmith | .2500 | 27.0 | 1884-1884 | |
| 3. | James Burke | .3009 | 28.0 | 1884-1884 | |
| 4. | Sam Weaver | .3158 | 33.0 | 1884-1884 | |
| 5. | Lady Baldwin | .3364 | 27.0 | 1884-1884 | |
| 6. | Guy Hecker | .3806 | 36.0 | 1884-1884 |
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