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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 | 2017-2022 | .258 | 58 | 189 | 0 | 0 | 0 | 0.00 | 0 |
| Eddie O'Bryan | 2018-2024 | .219 | 4 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Chris O'Colgley | 2014-2016 | .265 | 13 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Leonard O'Connor | 2018-2028 | .242 | 29 | 117 | 0 | 0 | 0 | 0.00 | 0 |
| Robert O'Connor | 2019-2028 | .242 | 60 | 211 | 0 | 0 | 0 | 0.00 | 0 |
| Dave O'Day | 2018-2021 | .240 | 2 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Christian O'Dell | 2015-2018 | .242 | 35 | 120 | 0 | 0 | 0 | 0.00 | 0 |
| Trevor O'Herlihy | 2028-2028 | .182 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| William O'Keefe | 2028-2028 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Carl O'Malloy | 2015-2017 | .000 | 0 | 0 | 0 | 1 | 1 | 6.33 | 42 |
| Mark O'Monaghan | 2018-2021 | .240 | 19 | 85 | 0 | 0 | 0 | 0.00 | 0 |
| Christian O'Neal | 2017-2021 | .266 | 12 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Aaron O'Neill | 2015-2019 | .186 | 0 | 3 | 5 | 11 | 0 | 5.17 | 97 |
| Eric O'Neill | 2027-2027 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ron O'Slattery | 2018-2018 | .192 | 0 | 1 | 4 | 2 | 0 | 6.26 | 61 |
| Jake O'Tomalty | 2020-2026 | .000 | 0 | 0 | 1 | 2 | 4 | 3.81 | 50 |
| Alin Oanta | 2023-2027 | .000 | 0 | 0 | 0 | 1 | 0 | 6.85 | 22 |
| Munemori Ohara | 2020-2027 | .255 | 40 | 188 | 0 | 0 | 0 | 0.00 | 0 |
| Taro Ohayashi | 2028-2028 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Akihiko Oike | 2019-2023 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Noriaki Okada | 2024-2024 | .212 | 0 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Cipriano Oliveira | 2015-2016 | .186 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Richard Ollivier | 2015-2015 | .385 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Olvero | 2023-2025 | .000 | 0 | 0 | 0 | 3 | 7 | 6.25 | 57 |
| Mike Ontiveros | 2018-2018 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Orchard | 2023-2023 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ordóńez | 2028-2028 | .000 | 0 | 0 | 0 | 1 | 0 | 1.23 | 3 |
| Steve Ormston | 2017-2019 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Ornelas | 2023-2027 | .261 | 31 | 108 | 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 | 2015-2023 | .265 | 13 | 189 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Orozco | 2021-2026 | .237 | 29 | 117 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortega | 2018-2025 | .252 | 103 | 343 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Ortega | 2028-2028 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortega | 2023-2027 | .194 | 7 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortega | 2025-2027 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Lorenzo Ortega | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Norm Ortega | 2017-2021 | .284 | 13 | 76 | 0 | 0 | 0 | 0.00 | 0 |
| Ramón Ortega | 2015-2024 | .000 | 0 | 0 | 11 | 19 | 0 | 3.81 | 264 |
| Roberto Ortega | 2018-2019 | .209 | 0 | 7 | 21 | 14 | 0 | 2.71 | 304 |
| Alberto Ortíz | 2015-2021 | .211 | 0 | 1 | 11 | 8 | 1 | 4.70 | 215 |
| Alberto Ortíz | 2016-2016 | .237 | 3 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Alfredo Ortíz | 2015-2018 | .281 | 10 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortíz | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Emílio Ortíz | 2022-2022 | .208 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2024-2025 | .000 | 0 | 0 | 3 | 3 | 1 | 5.19 | 23 |
| Pedro Ortíz | 2020-2027 | .000 | 0 | 0 | 6 | 7 | 0 | 3.39 | 81 |
| Raúl Ortíz | 2028-2028 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Reynaldo Ortíz | 2024-2027 | .000 | 0 | 0 | 1 | 7 | 0 | 4.33 | 66 |
| Sergio Ortíz | 2025-2028 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Vincente Ortíz | 2024-2027 | .000 | 0 | 0 | 1 | 3 | 1 | 4.14 | 22 |
| Wesley Osborne | 2014-2015 | .227 | 4 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Jon Osterman | 2028-2028 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Yajirobei Otomo | 2028-2028 | .000 | 0 | 0 | 9 | 4 | 19 | 2.65 | 56 |
| Bill Oulton | 2021-2027 | .000 | 0 | 0 | 7 | 6 | 0 | 3.25 | 103 |
| Jason Owens | 2014-2015 | .233 | 1 | 17 | 0 | 0 | 0 | 0.00 | 0 |
