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| "O" Pitching Register | |
| Batting Register | Pitching Glossary |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO | PWS |
| Hank O'Day | 1884-1884 | 1 | 1 | .500 | 2.70 | 9 | 0 | 0 | 0 | 1 | 10.0 | 9 | 3 | 0 | 5 | 1 | 0.7 |
| Tip O'Neill | 1884-1884 | 5 | 3 | .625 | 3.19 | 31 | 0 | 0 | 0 | 15 | 31.0 | 39 | 11 | 0 | 6 | 10 | 4.4 |
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