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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 |
| 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 |
| 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 |
| 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 | 2026-2027 | .000 | 0 | 0 | 3 | 2 | 13 | 4.42 | 24 |
| 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 |
| 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 |
| Taro Ohayashi | 2022-2022 | .000 | 0 | 0 | 3 | 5 | 0 | 3.93 | 27 |
| 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 |
| Jesús Orozco | 2018-2019 | .280 | 16 | 69 | 0 | 0 | 0 | 0.00 | 0 |
| 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 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| 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 | 2028-2028 | .259 | 1 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2025-2025 | .000 | 0 | 0 | 0 | 0 | 5 | 1.17 | 5 |
| Luis Ortíz | 2025-2025 | .000 | 0 | 0 | 1 | 1 | 0 | 4.50 | 6 |
| Luis Ortíz | 2016-2016 | .000 | 0 | 0 | 3 | 0 | 1 | 7.99 | 24 |
| Martin Ortíz | 2026-2028 | .000 | 0 | 0 | 3 | 6 | 3 | 3.72 | 67 |
| Reynaldo Ortíz | 2020-2028 | .000 | 0 | 0 | 11 | 19 | 0 | 4.61 | 216 |
| 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 |
| 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 | 2021-2021 | .000 | 0 | 0 | 1 | 2 | 0 | 6.12 | 23 |
| Mike Owens | 2025-2026 | .000 | 0 | 0 | 10 | 9 | 0 | 3.06 | 114 |
