| Retro ID | Player | Year | Team | History | Is Pitcher? | PA or IP | WAR | Wins | Losses |
|---|---|---|---|---|---|---|---|---|---|
| obrij105 | O'Brien, Jack | 1882 | PH4 | All PH4 | 0 | 254 | 2.8 | 4 | -1 |
| obrij105 | O'Brien, Jack | 1883 | PH4 | All PH4 | 0 | 415 | 2.7 | 5 | 0 |
| obrij105 | O'Brien, Jack | 1890 | PH4 | All PH4 | 0 | 497 | 1.8 | 5 | 2 |
| obrij105 | O'Brien, Jack | 1884 | PH4 | All PH4 | 0 | 150 | 1 | 2 | 0 |
| obrij105 | O'Brien, Jack | 1885 | PH4 | All PH4 | 0 | 250 | 0.8 | 2 | 1 |
| obrij105 | O'Brien, Jack | 1886 | PH4 | All PH4 | 0 | 468 | 0.5 | 3 | 2 |
| obrij105 | O'Brien, Jack | 1887 | BR3 | All BR3 | 0 | 129 | -0.7 | 0 | 1 |
| obrij105 | O'Brien, Jack | 1888 | BL2 | All BL2 | 0 | 217 | 0.3 | 1 | 1 |