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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 |
|---|---|---|---|---|---|---|---|---|---|
| Eddie O'Bryan | 2017-2018 | .253 | 5 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Robert O'Connor | 2018-2018 | .343 | 11 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Christian O'Dell | 2015-2019 | .409 | 7 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Warren O'Herlihy | 2015-2017 | .265 | 16 | 70 | 0 | 0 | 0 | 0.00 | 0 |
| Carl O'Malloy | 2015-2016 | .000 | 0 | 0 | 2 | 4 | 1 | 5.21 | 48 |
| Greg O'Mulrian | 2015-2018 | .249 | 4 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Aaron O'Neill | 2015-2015 | .000 | 0 | 0 | 3 | 0 | 1 | 3.57 | 29 |
| Munemori Ohara | 2017-2019 | .309 | 18 | 111 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Oliva | 2016-2016 | .000 | 0 | 0 | 0 | 0 | 0 | 7.29 | 27 |
| Cipriano Oliveira | 2015-2016 | .286 | 13 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Anbrosio Oppenes | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Orchard | 2017-2017 | .310 | 11 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Orozco | 2018-2018 | .315 | 0 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| David Ortega | 2019-2019 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Eduardo Ortega | 2016-2017 | .000 | 0 | 0 | 1 | 0 | 0 | 5.53 | 21 |
| Francisco Ortega | 2017-2017 | .303 | 7 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Leonardo Ortega | 2017-2019 | .252 | 5 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Alberto Ortíz | 2015-2015 | .000 | 0 | 0 | 0 | 0 | 0 | 2.61 | 8 |
| Alfredo Ortíz | 2015-2015 | .345 | 3 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ortíz | 2015-2016 | .000 | 0 | 0 | 1 | 0 | 1 | 4.55 | 24 |
