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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
|---|---|---|---|---|---|---|---|---|---|
| Dylan O'Brien | 2017-2017 | .323 | 8 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Mark O'Connor | 2027-2027 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Scott O'Connor | 2017-2017 | .270 | 0 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Adam O'Dell | 2020-2020 | .314 | 14 | 52 | 0 | 0 | 0 | 0.00 | 0 |
| David O'Farrell | 2024-2024 | .343 | 20 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Bill O'Leary | 2032-2032 | .333 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Doug O'Leary | 2029-2029 | .316 | 8 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Tim O'Neil | 2031-2031 | .153 | 4 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| John Oakes | 2023-2024 | .425 | 57 | 157 | 0 | 0 | 0 | 0.00 | 0 |
| Perry Offredi | 2032-2032 | .233 | 2 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Hideyori Ohayashi | 2019-2019 | .000 | 0 | 0 | 7 | 2 | 0 | 2.99 | 86 |
| Gary Ohler | 2031-2031 | .000 | 0 | 0 | 1 | 1 | 2 | 6.89 | 16 |
| Ethan Oldreave | 2021-2021 | .345 | 13 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Flint Olivier | 2027-2027 | .222 | 5 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Yves Olivier | 2027-2027 | .199 | 4 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Tomás Ontiveros | 2021-2021 | .000 | 0 | 0 | 6 | 2 | 0 | 3.52 | 53 |
| Keith Ormon | 2032-2032 | .000 | 0 | 0 | 0 | 0 | 3 | 8.28 | 20 |
| Esteban Orosco | 2020-2020 | .221 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Roger Orr | 2024-2024 | .000 | 0 | 0 | 3 | 3 | 0 | 3.64 | 81 |
| Lorenzo Ortega | 2021-2021 | .000 | 0 | 0 | 4 | 0 | 12 | 4.03 | 22 |
| Paco Ortega | 2022-2022 | .000 | 0 | 0 | 5 | 6 | 0 | 4.14 | 78 |
| Ernesto Ortíz | 2019-2019 | .328 | 9 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Javier Ortíz | 2022-2022 | .000 | 0 | 0 | 5 | 6 | 0 | 5.93 | 86 |
| Ramón Ortíz | 2019-2019 | .256 | 17 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| John Ostrom | 2025-2025 | .000 | 0 | 0 | 2 | 4 | 0 | 5.46 | 65 |
| Takeshi Osumi | 2032-2032 | .000 | 0 | 0 | 1 | 0 | 0 | 2.25 | 7 |
| Royce Otto | 2031-2031 | .129 | 2 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Hsui-chen Ow | 2026-2026 | .212 | 10 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Marc Owen | 2026-2026 | .263 | 6 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Otto Owens | 2031-2031 | .290 | 3 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Don Owry | 2030-2030 | .000 | 0 | 0 | 1 | 3 | 0 | 8.75 | 35 |
| Randy Owry | 2025-2025 | .000 | 0 | 0 | 3 | 2 | 0 | 3.86 | 86 |
| Tommy Owry | 2031-2031 | .000 | 0 | 0 | 1 | 0 | 0 | 4.39 | 30 |
| Ken Oxford | 2032-2032 | .000 | 0 | 0 | 1 | 0 | 0 | 3.18 | 28 |
