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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 |
|---|---|---|---|---|---|---|---|---|---|
| Ju-hyung O | 2019-2019 | .000 | 0 | 0 | 0 | 0 | 1 | 7.04 | 8 |
| Jack O'Brien | 2016-2020 | .270 | 41 | 213 | 0 | 0 | 0 | 0.00 | 0 |
| Mike O'Brien | 2016-2019 | .263 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Paul O'Callahan | 2015-2016 | .000 | 0 | 0 | 2 | 9 | 3 | 8.01 | 75 |
| Dennis O'Connor | 2015-2017 | .300 | 24 | 102 | 0 | 0 | 0 | 0.00 | 0 |
| Homer O'Lannigan | 2018-2020 | .000 | 0 | 0 | 17 | 24 | 0 | 4.84 | 389 |
| Aaron O'Neill | 2019-2019 | .000 | 0 | 0 | 0 | 0 | 1 | 10.80 | 1 |
| Dustin O'Quinlevan | 2018-2019 | .264 | 10 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Dale O'Sullivan | 2019-2019 | .217 | 2 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Floyd Oglethorpe | 2018-2018 | .000 | 0 | 0 | 0 | 1 | 0 | 8.78 | 31 |
| Luis Oliva | 2017-2019 | .000 | 0 | 0 | 9 | 6 | 4 | 5.46 | 126 |
| Armando Olvera | 2020-2020 | .222 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Ormston | 2020-2020 | .500 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| David Ortega | 2020-2020 | .180 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Eduardo Ortega | 2017-2017 | .000 | 0 | 0 | 0 | 0 | 0 | 4.50 | 6 |
| Lorenzo Ortega | 2016-2020 | .000 | 0 | 0 | 5 | 8 | 25 | 5.50 | 47 |
| Alberto Ortíz | 2015-2020 | .343 | 5 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Alfredo Ortíz | 2018-2019 | .375 | 1 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortíz | 2017-2019 | .000 | 0 | 0 | 2 | 5 | 2 | 6.50 | 60 |
| Emílio Ortíz | 2019-2019 | .209 | 3 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Manuel Ortíz | 2016-2019 | .000 | 0 | 0 | 12 | 5 | 9 | 4.33 | 158 |
| Orlando Ortíz | 2018-2018 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Sergio Ortíz | 2019-2019 | .271 | 6 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Ken Osborne | 2018-2019 | .290 | 1 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Otero | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Chris Oudekirk | 2016-2020 | .251 | 18 | 140 | 0 | 0 | 0 | 0.00 | 0 |
| Jason Owens | 2017-2017 | .216 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Doruk Oyan | 2015-2019 | .000 | 0 | 0 | 12 | 13 | 0 | 5.66 | 249 |
