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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 | 2022-2030 | .217 | 3 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Paul O'Callahan | 2020-2022 | .000 | 0 | 0 | 0 | 0 | 1 | 7.31 | 13 |
| Colin O'Connell | 2031-2034 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Leonard O'Connor | 2017-2028 | .276 | 60 | 264 | 0 | 0 | 0 | 0.00 | 0 |
| Robert O'Connor | 2019-2030 | .243 | 6 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Dave O'Day | 2019-2023 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jimmy O'Flahavan | 2031-2034 | .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 | 2027-2034 | .274 | 8 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Carl O'Malloy | 2015-2017 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Anderson O'Mara | 2026-2033 | .000 | 0 | 0 | 17 | 16 | 34 | 3.43 | 158 |
| 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 |
| Ricky O'Toole | 2034-2034 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Alin Oanta | 2021-2022 | .000 | 0 | 0 | 8 | 9 | 1 | 4.95 | 68 |
| Goodluck Obasanjo | 2032-2034 | .000 | 0 | 0 | 6 | 3 | 5 | 3.92 | 41 |
| Hirohisa Ogasawara | 2029-2034 | .198 | 7 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Munemori Ohara | 2021-2031 | .250 | 17 | 100 | 0 | 0 | 0 | 0.00 | 0 |
| Shigenobu Ohayashi | 2032-2034 | .241 | 7 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Akihiko Oike | 2019-2024 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Noburo Oishi | 2033-2034 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Piotr Oja | 2030-2034 | .000 | 0 | 0 | 24 | 23 | 7 | 3.89 | 385 |
| 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 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Emil Olsson | 2028-2031 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Olvero | 2021-2023 | .000 | 0 | 0 | 2 | 7 | 12 | 4.23 | 59 |
| Kazu Omori | 2030-2031 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Tzu-hsia Ong | 2030-2030 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Marcos Oquendo | 2030-2034 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Orchard | 2021-2024 | .237 | 10 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ordóńez | 2032-2032 | .000 | 0 | 0 | 0 | 2 | 0 | 6.07 | 2 |
| Steve Ormston | 2015-2019 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Aurelio Ornelas | 2031-2031 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Ornelas | 2023-2031 | .222 | 22 | 93 | 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 |
| 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 | 2029-2030 | .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 |
| Pedro Ortega | 2030-2030 | .000 | 0 | 0 | 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 | 2029-2030 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2023-2028 | .000 | 0 | 0 | 2 | 5 | 5 | 3.44 | 28 |
| Pedro Ortíz | 2020-2034 | .333 | 0 | 0 | 32 | 26 | 3 | 3.50 | 380 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Raúl Ortíz | 2025-2032 | .282 | 7 | 118 | 0 | 0 | 0 | 0.00 | 0 |
| Reynaldo Ortíz | 2023-2026 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Sergio Ortíz | 2025-2034 | .238 | 19 | 61 | 0 | 0 | 0 | 0.00 | 0 |
| Vincente Ortíz | 2023-2028 | .000 | 0 | 0 | 0 | 4 | 0 | 7.88 | 19 |
| Richard Osborn | 2029-2034 | .000 | 0 | 0 | 3 | 3 | 1 | 4.35 | 57 |
| Wesley Osborne | 2014-2017 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jon Osterman | 2028-2034 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Otero | 2031-2034 | .000 | 0 | 0 | 29 | 15 | 0 | 3.18 | 421 |
| Yajirobei Otomo | 2028-2034 | .000 | 0 | 0 | 11 | 8 | 4 | 2.93 | 122 |
| Bill Oulton | 2021-2034 | .000 | 0 | 0 | 93 | 56 | 0 | 3.13 | 1065 |
| Mike Owens | 2029-2032 | .000 | 0 | 0 | 0 | 6 | 0 | 8.16 | 27 |
