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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cinders O'Brien | 1888-1889 | 27 | 25 | .519 | 2.43 | 60 | 51 | 40 | 2 | 0 | 445.0 | 358 | 120 | 14 | 160 | 196 |
| Hank O'Day | 1884-1897 | 42 | 25 | .627 | 2.74 | 117 | 62 | 46 | 5 | 5 | 615.0 | 552 | 187 | 18 | 214 | 211 |
| Ed O'Neil | 1890-1894 | 0 | 0 | .000 | 3.78 | 7 | 0 | 0 | 0 | 0 | 16.2 | 22 | 7 | 0 | 9 | 7 |
| Hugh O'Neil | 1875-1883 | 30 | 31 | .492 | 2.33 | 123 | 56 | 38 | 2 | 4 | 587.1 | 613 | 152 | 5 | 35 | 93 |
| Tip O'Neill | 1883-1893 | 47 | 106 | .307 | 4.15 | 329 | 161 | 60 | 4 | 0 | 1470.2 | 1719 | 678 | 46 | 668 | 403 |
| Mike O'Rourke | 1890-1895 | 20 | 32 | .385 | 4.77 | 106 | 50 | 27 | 2 | 0 | 528.1 | 603 | 280 | 9 | 331 | 127 |
| U O'Rourke | 1872-1884 | 38 | 97 | .281 | 3.64 | 418 | 105 | 45 | 1 | 17 | 1371.0 | 1873 | 555 | 13 | 157 | 225 |
| Lance Obrein | 1895-1897 | 0 | 0 | .000 | 2.35 | 4 | 0 | 0 | 0 | 0 | 7.2 | 8 | 2 | 1 | 4 | 2 |
| Al Orth | 1895-1897 | 0 | 0 | .000 | 2.87 | 8 | 0 | 0 | 0 | 0 | 15.2 | 17 | 5 | 0 | 2 | 1 |
