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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 | 2013-2022 | .253 | 60 | 198 | 1 | 0 | 0 | 15.00 | 0 |
| Eddie O'Bryan | 2022-2029 | .223 | 3 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Paul O'Callahan | 2020-2022 | .000 | 0 | 0 | 0 | 0 | 1 | 7.31 | 13 |
| Leonard O'Connor | 2017-2028 | .276 | 60 | 264 | 0 | 0 | 0 | 0.00 | 0 |
| Robert O'Connor | 2019-2029 | .243 | 6 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Dave O'Day | 2019-2023 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Nathaniel O'Heyne | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| William O'Keefe | 2027-2028 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Carl O'Malloy | 2015-2017 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Anderson O'Mara | 2026-2029 | .000 | 0 | 0 | 9 | 15 | 32 | 3.21 | 123 |
| Mark O'Monaghan | 2019-2022 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Christian O'Neal | 2019-2019 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Aaron O'Neill | 2015-2015 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Eric O'Neill | 2023-2025 | .171 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Ron O'Slattery | 2020-2021 | .000 | 0 | 0 | 1 | 1 | 0 | 9.58 | 4 |
| Jake O'Tomalty | 2019-2027 | .000 | 0 | 0 | 2 | 2 | 2 | 3.02 | 28 |
| Alin Oanta | 2021-2022 | .000 | 0 | 0 | 8 | 9 | 1 | 4.95 | 68 |
| Hirohisa Ogasawara | 2029-2029 | .119 | 2 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Munemori Ohara | 2021-2029 | .256 | 13 | 73 | 0 | 0 | 0 | 0.00 | 0 |
| Akihiko Oike | 2019-2024 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Noriaki Okada | 2022-2024 | .154 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Cipriano Oliveira | 2016-2016 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Richard Ollivier | 2013-2016 | .143 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Emil Olsson | 2028-2029 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Olvero | 2021-2023 | .000 | 0 | 0 | 2 | 7 | 12 | 4.23 | 59 |
| Dave Orchard | 2021-2024 | .237 | 10 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Ormston | 2015-2019 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Ornelas | 2023-2029 | .222 | 19 | 79 | 0 | 0 | 0 | 0.00 | 0 |
| Enrique Orozco | 2013-2013 | .204 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Orozco | 2020-2028 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Juan Orozco | 2017-2024 | .303 | 4 | 94 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Orozco | 2020-2025 | .224 | 3 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortega | 2018-2024 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Enrique Ortega | 2029-2029 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortega | 2023-2027 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortega | 2024-2026 | .258 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Lorenzo Ortega | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Norm Ortega | 2016-2022 | .295 | 11 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Ramón Ortega | 2013-2028 | .127 | 0 | 21 | 131 | 75 | 5 | 3.21 | 1849 |
| Roberto Ortega | 2019-2020 | .105 | 0 | 0 | 8 | 10 | 0 | 3.26 | 132 |
| Alberto Ortíz | 2018-2022 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Alberto Ortíz | 2016-2016 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Alfredo Ortíz | 2015-2015 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Emílio Ortíz | 2023-2024 | .138 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Ortíz | 2029-2029 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2023-2028 | .000 | 0 | 0 | 2 | 5 | 5 | 3.44 | 28 |
| Pedro Ortíz | 2020-2028 | .333 | 0 | 0 | 29 | 22 | 2 | 3.42 | 337 |
| Raúl Ortíz | 2025-2029 | .288 | 4 | 84 | 0 | 0 | 0 | 0.00 | 0 |
| Reynaldo Ortíz | 2023-2026 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Sergio Ortíz | 2025-2029 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Vincente Ortíz | 2023-2028 | .000 | 0 | 0 | 0 | 4 | 0 | 7.88 | 19 |
| Richard Osborn | 2029-2029 | .000 | 0 | 0 | 0 | 0 | 0 | 3.38 | 3 |
| Wesley Osborne | 2014-2017 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jon Osterman | 2028-2029 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Yajirobei Otomo | 2028-2029 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Oulton | 2021-2029 | .000 | 0 | 0 | 73 | 43 | 0 | 2.88 | 854 |
| Mike Owens | 2029-2029 | .000 | 0 | 0 | 0 | 6 | 0 | 8.16 | 27 |
