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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 |
|---|---|---|---|---|---|---|---|---|---|
| Eddie O'Bryan | 2018-2028 | .261 | 15 | 88 | 0 | 0 | 0 | 0.00 | 0 |
| Leonard O'Connor | 2031-2031 | .147 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Robert O'Connor | 2018-2018 | .297 | 15 | 49 | 0 | 1 | 0 | 67.50 | 2 |
| Christian O'Dell | 2019-2023 | .263 | 29 | 149 | 0 | 0 | 0 | 0.00 | 0 |
| Jimmy O'Flahavan | 2029-2029 | .000 | 0 | 0 | 5 | 9 | 0 | 4.66 | 120 |
| Trevor O'Herlihy | 2028-2028 | .600 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Warren O'Herlihy | 2017-2017 | .285 | 14 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Vincent O'Higgin | 2032-2032 | .000 | 0 | 0 | 2 | 1 | 0 | 3.81 | 19 |
| Carl O'Malloy | 2016-2019 | .000 | 0 | 0 | 3 | 5 | 2 | 5.37 | 125 |
| Christian O'Neal | 2017-2023 | .283 | 11 | 84 | 0 | 0 | 0 | 0.00 | 0 |
| Aaron O'Neill | 2017-2022 | .000 | 0 | 0 | 4 | 3 | 0 | 4.48 | 40 |
| Eric O'Neill | 2022-2027 | .256 | 4 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Ron O'Slattery | 2022-2024 | .000 | 0 | 0 | 3 | 5 | 0 | 4.19 | 26 |
| Will O'Slattery | 2026-2032 | .000 | 0 | 0 | 3 | 3 | 13 | 4.26 | 44 |
| Jake O'Tomalty | 2028-2028 | .000 | 0 | 0 | 2 | 1 | 0 | 4.05 | 7 |
| Alin Oanta | 2020-2027 | .000 | 0 | 0 | 46 | 28 | 0 | 3.61 | 646 |
| Goodluck Obasanjo | 2029-2031 | .000 | 0 | 0 | 9 | 11 | 0 | 4.86 | 111 |
| Ramón Ocegueda | 2032-2032 | .000 | 0 | 0 | 2 | 1 | 1 | 2.25 | 21 |
| Floyd Oglethorpe | 2015-2016 | .000 | 0 | 0 | 5 | 13 | 0 | 7.70 | 119 |
| Munemori Ohara | 2019-2027 | .303 | 11 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Shigenobu Ohayashi | 2031-2032 | .321 | 3 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Taro Ohayashi | 2022-2031 | .000 | 0 | 0 | 10 | 15 | 1 | 5.14 | 126 |
| Brian Olivares | 2020-2020 | .288 | 4 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Cipriano Oliveira | 2015-2021 | .327 | 2 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Richard Ollivier | 2015-2021 | .333 | 28 | 123 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Olvero | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 2 |
| Mike Ontiveros | 2022-2022 | 1.000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ordóńez | 2028-2028 | .000 | 0 | 0 | 6 | 6 | 0 | 4.17 | 49 |
| Francisco Ornelas | 2030-2032 | .221 | 7 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Orozco | 2018-2029 | .279 | 19 | 100 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Pedro Orozco | 2025-2026 | .256 | 5 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortega | 2023-2025 | .316 | 16 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Eduardo Ortega | 2016-2016 | .000 | 0 | 0 | 0 | 0 | 0 | 7.36 | 7 |
| Francisco Ortega | 2018-2028 | .310 | 15 | 90 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortega | 2023-2027 | .225 | 3 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Leonardo Ortega | 2018-2018 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Alberto Ortíz | 2017-2017 | .000 | 0 | 0 | 1 | 7 | 21 | 4.98 | 39 |
| António Ortíz | 2032-2032 | .188 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Armando Ortíz | 2030-2030 | .000 | 0 | 0 | 0 | 0 | 0 | 7.71 | 1 |
| Carlos Ortíz | 2022-2022 | .000 | 0 | 0 | 4 | 8 | 0 | 8.28 | 45 |
| Emílio Ortíz | 2020-2022 | .268 | 4 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Ortíz | 2028-2032 | .261 | 5 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2031-2031 | .000 | 0 | 0 | 1 | 1 | 2 | 5.10 | 37 |
| José Ortíz | 2025-2029 | .000 | 0 | 0 | 2 | 0 | 5 | 2.70 | 23 |
| Luis Ortíz | 2025-2032 | .000 | 0 | 0 | 9 | 15 | 0 | 5.08 | 136 |
| Luis Ortíz | 2016-2016 | .000 | 0 | 0 | 3 | 0 | 1 | 7.99 | 24 |
| Martin Ortíz | 2026-2032 | .000 | 0 | 0 | 5 | 9 | 4 | 3.70 | 85 |
| Reynaldo Ortíz | 2020-2028 | .000 | 0 | 0 | 11 | 19 | 0 | 4.61 | 216 |
| Vincente Ortíz | 2032-2032 | .000 | 0 | 0 | 1 | 3 | 1 | 3.30 | 19 |
| Andrew Osborne | 2017-2017 | .000 | 0 | 0 | 1 | 3 | 0 | 7.47 | 34 |
| Ken Osborne | 2015-2027 | .298 | 6 | 63 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Osorio | 2029-2032 | .230 | 1 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Otero | 2029-2032 | .000 | 0 | 0 | 8 | 6 | 0 | 3.60 | 117 |
| Jorge Otero | 2030-2030 | .000 | 0 | 0 | 2 | 0 | 0 | 1.46 | 10 |
| Yajirobei Otomo | 2026-2027 | .000 | 0 | 0 | 4 | 2 | 32 | 3.15 | 66 |
| Jasper Otto | 2028-2028 | .217 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Oulton | 2021-2032 | .000 | 0 | 0 | 2 | 4 | 0 | 6.84 | 43 |
| Mike Owens | 2025-2026 | .000 | 0 | 0 | 10 | 9 | 0 | 3.06 | 114 |
