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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 |
| Paul O'Callahan | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Leonard O'Connor | 2017-2019 | .283 | 28 | 120 | 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 |
| Ron O'Slattery | 2020-2020 | .000 | 0 | 0 | 0 | 1 | 0 | 29.70 | 0 |
| Jake O'Tomalty | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Akihiko Oike | 0-0 | .000 | 0 | 0 | 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 |
| Steve Ormston | 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 |
| Juan Orozco | 2020-2020 | .331 | 1 | 27 | 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 |
| Carlos 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 | 2013-2020 | .127 | 0 | 21 | 99 | 43 | 0 | 2.94 | 1320 |
| 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 |
| Jesús Ortíz | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| José Antonio Ortíz | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Ortíz | 2020-2020 | .333 | 0 | 0 | 4 | 3 | 0 | 2.70 | 42 |
| Wesley Osborne | 2017-2017 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| José Osorio | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
