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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 | 2013-2016 | .253 | 60 | 198 | 1 | 0 | 0 | 15.00 | 0 |
| Eddie O'Bryan | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Paul O'Callahan | 2021-2022 | .000 | 0 | 0 | 0 | 0 | 1 | 7.31 | 13 |
| Leonard O'Connor | 2017-2023 | .276 | 60 | 264 | 0 | 0 | 0 | 0.00 | 0 |
| Robert O'Connor | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Dave O'Day | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Nathaniel O'Heyne | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Carl O'Malloy | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Mark O'Monaghan | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Christian O'Neal | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Aaron O'Neill | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Eric O'Neill | 2023-2023 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ron O'Slattery | 2020-2021 | .000 | 0 | 0 | 1 | 1 | 0 | 9.58 | 4 |
| Jake O'Tomalty | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Alin Oanta | 2021-2022 | .000 | 0 | 0 | 8 | 9 | 1 | 4.95 | 68 |
| Luis Ochoa | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Munemori Ohara | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Akihiko Oike | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Piotr Oja | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Noriaki Okada | 2022-2023 | .154 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Cipriano Oliveira | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Richard Ollivier | 2013-2016 | .143 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Olvero | 2021-2022 | .000 | 0 | 0 | 2 | 7 | 12 | 4.23 | 59 |
| Octávio Ontiveros | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Orchard | 2021-2023 | .240 | 10 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| José Orihvela | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Ormston | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Ornelas | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Enrique Orozco | 2013-2013 | .204 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Orozco | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Juan Orozco | 2020-2023 | .304 | 4 | 82 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Orozco | 2020-2020 | .224 | 3 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortega | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortega | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Lorenzo Ortega | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Norm Ortega | 2016-2016 | .295 | 11 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Ramón Ortega | 2013-2022 | .127 | 0 | 21 | 112 | 55 | 0 | 3.09 | 1520 |
| Roberto Ortega | 2020-2020 | .105 | 0 | 0 | 8 | 10 | 0 | 3.26 | 132 |
| Alberto Ortíz | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Alberto Ortíz | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Alfredo Ortíz | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Emílio Ortíz | 2023-2023 | .074 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| José Antonio Ortíz | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Ortíz | 2020-2023 | .333 | 0 | 0 | 25 | 16 | 2 | 3.28 | 274 |
| Reynaldo Ortíz | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Roberto Ortíz | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Ortíz | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Vincente Ortíz | 2023-2023 | .000 | 0 | 0 | 0 | 4 | 0 | 7.88 | 19 |
| Wesley Osborne | 2017-2017 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Osorio | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Oulton | 2022-2023 | .000 | 0 | 0 | 14 | 11 | 0 | 3.14 | 223 |
