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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 |
|---|---|---|---|---|---|---|---|---|---|
| Brian O'Brian | 2015-2022 | .266 | 33 | 122 | 0 | 0 | 0 | 0.00 | 0 |
| Jack O'Brien | 2023-2023 | .167 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Mike O'Brien | 2015-2015 | .296 | 0 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Eddie O'Bryan | 2018-2024 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Paul O'Callahan | 2015-2022 | .182 | 0 | 0 | 1 | 8 | 0 | 8.96 | 52 |
| Chris O'Colgley | 2015-2015 | .283 | 10 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Leonard O'Connor | 2018-2030 | .254 | 55 | 278 | 0 | 0 | 0 | 0.00 | 0 |
| Robert O'Connor | 2018-2030 | .264 | 84 | 398 | 0 | 0 | 0 | 7.71 | 5 |
| Dave O'Day | 2019-2023 | .234 | 5 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Christian O'Dell | 2016-2018 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jimmy O'Flahavan | 2030-2030 | .000 | 0 | 0 | 3 | 3 | 7 | 3.03 | 32 |
| Nathaniel O'Heyne | 2019-2021 | .083 | 0 | 5 | 8 | 13 | 0 | 4.56 | 103 |
| William O'Keefe | 2027-2030 | .272 | 21 | 80 | 0 | 0 | 0 | 0.00 | 0 |
| Mark O'Monaghan | 2022-2023 | .220 | 2 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Christian O'Neal | 2018-2019 | .294 | 6 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Aaron O'Neill | 2016-2019 | .333 | 0 | 2 | 7 | 7 | 1 | 5.70 | 91 |
| Eric O'Neill | 2023-2024 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ron O'Slattery | 2016-2022 | .219 | 0 | 3 | 9 | 6 | 0 | 3.60 | 100 |
| Jake O'Tomalty | 2017-2026 | .667 | 0 | 1 | 23 | 22 | 95 | 3.06 | 345 |
| Munemori Ohara | 2020-2028 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Taro Ohayashi | 2024-2029 | .000 | 0 | 0 | 15 | 17 | 3 | 4.33 | 315 |
| Akihiko Oike | 2018-2026 | .262 | 104 | 390 | 0 | 0 | 0 | 0.00 | 0 |
| Noburo Oishi | 2029-2030 | .000 | 0 | 0 | 5 | 14 | 2 | 5.55 | 120 |
| Noriaki Okada | 2023-2025 | .158 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Richard Ollivier | 2016-2016 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Emil Olsson | 2028-2030 | .000 | 0 | 0 | 1 | 10 | 1 | 3.50 | 103 |
| Jesús Olvero | 2023-2026 | .000 | 0 | 0 | 0 | 2 | 0 | 21.60 | 0 |
| Kazu Omori | 2030-2030 | .000 | 0 | 0 | 0 | 4 | 3 | 8.19 | 20 |
| Tzu-hsia Ong | 2030-2030 | .000 | 0 | 0 | 0 | 0 | 1 | 1.93 | 2 |
| Mike Ontiveros | 2015-2018 | .245 | 9 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Dave Orchard | 2023-2023 | .269 | 3 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Ormston | 2015-2019 | .225 | 2 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Ornelas | 2022-2029 | .219 | 9 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Orozco | 2020-2028 | .274 | 58 | 342 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Orozco | 2017-2024 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Orozco | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortega | 2018-2024 | .284 | 9 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Enrique Ortega | 2029-2030 | .295 | 14 | 63 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Ortega | 2028-2028 | .297 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortega | 2025-2029 | .180 | 0 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Lorenzo Ortega | 2016-2020 | 1.000 | 0 | 0 | 0 | 2 | 0 | 14.73 | 8 |
| Norm Ortega | 2017-2022 | .251 | 19 | 115 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Ortega | 2030-2030 | .211 | 3 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Ramón Ortega | 2022-2028 | .000 | 0 | 0 | 13 | 4 | 0 | 2.71 | 162 |
| Roberto Ortega | 2018-2018 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Alberto Ortíz | 2018-2022 | .200 | 0 | 0 | 3 | 8 | 6 | 5.50 | 99 |
| Alberto Ortíz | 2020-2021 | .235 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Alfredo Ortíz | 2016-2018 | .245 | 6 | 82 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortíz | 2020-2020 | .000 | 0 | 0 | 0 | 4 | 0 | 6.82 | 10 |
| Emílio Ortíz | 2024-2025 | .146 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Ortíz | 2029-2030 | .188 | 7 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2023-2027 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Ortíz | 2026-2030 | .000 | 0 | 0 | 21 | 17 | 3 | 4.15 | 220 |
| Raúl Ortíz | 2027-2027 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Reynaldo Ortíz | 2022-2027 | .000 | 0 | 0 | 23 | 31 | 2 | 4.48 | 377 |
| Sergio Ortíz | 2025-2030 | .283 | 99 | 404 | 0 | 0 | 0 | 0.00 | 0 |
| Vincente Ortíz | 2023-2028 | .000 | 0 | 0 | 12 | 17 | 19 | 4.35 | 109 |
| Ken Osborne | 2019-2019 | .333 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Wesley Osborne | 2015-2016 | .265 | 8 | 74 | 0 | 0 | 0 | 0.00 | 0 |
| Jon Osterman | 2028-2029 | .258 | 14 | 79 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Yajirobei Otomo | 2029-2030 | .000 | 0 | 0 | 5 | 9 | 47 | 3.39 | 98 |
| Bill Oulton | 2024-2029 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jason Owens | 2015-2015 | .257 | 1 | 14 | 0 | 0 | 0 | 0.00 | 0 |
