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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 |
|---|---|---|---|---|---|---|---|---|---|
| Mike O'Brien | 2020-2020 | .286 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Eddie O'Bryan | 2017-2018 | .253 | 5 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Paul O'Callahan | 2023-2023 | .000 | 0 | 0 | 0 | 1 | 0 | 5.06 | 10 |
| Robert O'Connor | 2018-2018 | .343 | 11 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Dan O'Day | 2026-2026 | .232 | 4 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Christian O'Dell | 2015-2019 | .409 | 7 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Warren O'Herlihy | 2015-2017 | .265 | 16 | 70 | 0 | 0 | 0 | 0.00 | 0 |
| Homer O'Lannigan | 2022-2023 | .000 | 0 | 0 | 15 | 17 | 0 | 4.38 | 196 |
| Carl O'Malloy | 2015-2016 | .000 | 0 | 0 | 2 | 4 | 1 | 5.21 | 48 |
| Greg O'Mulrian | 2015-2018 | .249 | 4 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Christian O'Neal | 2023-2023 | .187 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Aaron O'Neill | 2015-2015 | .000 | 0 | 0 | 3 | 0 | 1 | 3.57 | 29 |
| Eric O'Neill | 2020-2022 | .267 | 12 | 66 | 0 | 0 | 0 | 0.00 | 0 |
| Dustin O'Quinlevan | 2021-2022 | .212 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Dale O'Sullivan | 2021-2022 | .211 | 1 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Chris O'Toole | 2021-2023 | .000 | 0 | 0 | 1 | 2 | 0 | 3.72 | 15 |
| Héctor Ocampo | 2025-2025 | .000 | 0 | 0 | 4 | 7 | 0 | 3.78 | 89 |
| Munemori Ohara | 2017-2019 | .309 | 18 | 111 | 0 | 0 | 0 | 0.00 | 0 |
| Taro Ohayashi | 2021-2022 | .000 | 0 | 0 | 9 | 5 | 1 | 2.77 | 91 |
| Luis Oliva | 2016-2021 | .000 | 0 | 0 | 2 | 5 | 1 | 5.59 | 59 |
| Brian Olivares | 2020-2021 | .258 | 9 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Cipriano Oliveira | 2015-2016 | .286 | 13 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Ramón Oliveira | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 3 | 3.68 | 4 |
| Emil Olsson | 2025-2025 | .000 | 0 | 0 | 1 | 1 | 0 | 3.38 | 3 |
| José Olvera | 2026-2026 | .308 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Olvero | 2020-2020 | .000 | 0 | 0 | 1 | 0 | 6 | 0.87 | 11 |
| Anbrosio Oppenes | 2026-2026 | .173 | 2 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Orchard | 2017-2020 | .305 | 17 | 102 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Ormston | 2021-2021 | .222 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Germán Orozco | 2024-2024 | .000 | 0 | 0 | 1 | 7 | 1 | 4.98 | 15 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Jesús Orozco | 2024-2024 | .000 | 0 | 0 | 0 | 0 | 0 | 6.60 | 8 |
| Jesús Orozco | 2018-2018 | .315 | 0 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Cisco Ortega | 2025-2025 | .000 | 0 | 0 | 0 | 0 | 0 | 1.23 | 4 |
| David Ortega | 2019-2019 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Eduardo Ortega | 2016-2017 | .000 | 0 | 0 | 1 | 0 | 0 | 5.53 | 21 |
| Francisco Ortega | 2017-2017 | .303 | 7 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Gerardo Ortega | 2025-2025 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 1 |
| José Ortega | 2022-2022 | .279 | 6 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortega | 2021-2023 | .232 | 3 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Leonardo Ortega | 2017-2021 | .248 | 9 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Alberto Ortíz | 2015-2015 | .000 | 0 | 0 | 0 | 0 | 0 | 2.61 | 8 |
| Alfredo Ortíz | 2015-2015 | .345 | 3 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortíz | 2023-2023 | .000 | 0 | 0 | 7 | 8 | 0 | 3.46 | 65 |
| Emílio Ortíz | 2020-2020 | .329 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2025-2025 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2022-2022 | .000 | 0 | 0 | 4 | 3 | 22 | 3.66 | 47 |
| Luis Ortíz | 2020-2026 | .000 | 0 | 0 | 21 | 15 | 0 | 3.09 | 261 |
| Luis Ortíz | 2015-2016 | .000 | 0 | 0 | 1 | 0 | 1 | 4.55 | 24 |
| Martin Ortíz | 2026-2026 | .000 | 0 | 0 | 0 | 0 | 0 | 1.57 | 12 |
| Orlando Ortíz | 2023-2023 | .391 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Raúl Ortíz | 2023-2023 | .314 | 1 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Reynaldo Ortíz | 2020-2020 | .000 | 0 | 0 | 3 | 8 | 0 | 5.20 | 67 |
| Sergio Ortíz | 2021-2022 | .265 | 10 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Ken Osborne | 2024-2025 | .239 | 0 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| José Osorio | 2025-2026 | .289 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Kichisaburo Otani | 2023-2026 | .324 | 0 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Yajirobei Otomo | 2026-2026 | .000 | 0 | 0 | 3 | 2 | 15 | 1.41 | 41 |
| Jasper Otto | 2023-2023 | .250 | 5 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Chris Oudekirk | 2022-2023 | .217 | 3 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Owens | 2025-2025 | .000 | 0 | 0 | 1 | 5 | 0 | 4.83 | 36 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Doruk Oyan | 2020-2022 | .000 | 0 | 0 | 22 | 21 | 0 | 3.43 | 334 |
