| Retro ID | Player | Year | Team | History | Is Pitcher? | PA or IP | WAR | Wins | Losses |
|---|---|---|---|---|---|---|---|---|---|
| obrib102 | O'Brien, Billy | 1887 | WS8 | All WS8 | 0 | 479 | 2.8 | 6 | 3 |
| obrib102 | O'Brien, Billy | 1890 | BR4 | All BR4 | 0 | 419 | 0.9 | 3 | 3 |
| obrib102 | O'Brien, Billy | 1884 | SPU | All SPU | 0 | 30 | 0.1 | 0 | 0 |
| obrib102 | O'Brien, Billy | 1884 | KCU | All KCU | 0 | 17 | -0.1 | 0 | 0 |
| obrib102 | O'Brien, Billy | 1889 | WS8 | All WS8 | 0 | 9 | -0.2 | 0 | 0 |
| obrib102 | O'Brien, Billy | 1888 | WS8 | All WS8 | 0 | 537 | -0.7 | 3 | 6 |
| obrib102 | O'Brien, Billy | 1884 | SPU | All SPU | 1 | 10 | Array['WAR'] | 1 | 0 |