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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 |
|---|---|---|---|---|---|---|---|---|---|
| Fred O'Bryan | 2021-2024 | .252 | 13 | 76 | 0 | 0 | 0 | 0.00 | 0 |
| Donald O'Dell | 2017-2017 | .091 | 2 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Clayton O'Neil | 2022-2022 | .000 | 0 | 0 | 8 | 3 | 14 | 2.10 | 86 |
| Manuel Ochoa | 2020-2020 | .333 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Roy Offerman | 2020-2023 | .246 | 0 | 6 | 9 | 2 | 2 | 4.34 | 160 |
| Masutaro Ohayashi | 2013-2013 | .285 | 12 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Okuda | 2014-2014 | .248 | 8 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Jason Olbryc | 2020-2022 | .000 | 0 | 0 | 15 | 3 | 1 | 3.40 | 148 |
| José Olivo | 2017-2017 | .000 | 0 | 0 | 0 | 0 | 0 | 13.50 | 3 |
| Whit Olmstead | 2018-2018 | .290 | 2 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Raymond Olson | 2019-2019 | .221 | 1 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Oramas | 2012-2013 | .000 | 0 | 0 | 16 | 17 | 0 | 4.77 | 249 |
| Pedro Ordiales | 2022-2023 | .203 | 6 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Joseph Ortiz | 2024-2024 | .294 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Joseph Ortiz | 2018-2018 | .000 | 0 | 0 | 1 | 1 | 3 | 6.30 | 13 |
| Jorge Ortíz | 2023-2024 | .250 | 3 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Lawrence Ortíz | 2022-2022 | .000 | 0 | 0 | 2 | 0 | 0 | 1.89 | 18 |
| Manuel Ortíz | 2021-2023 | .218 | 1 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Paolo Ortíz | 2022-2023 | .212 | 10 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Bubba Osborn | 2019-2020 | .321 | 20 | 100 | 0 | 0 | 0 | 0.00 | 0 |
| Josh Osich | 2012-2014 | .000 | 0 | 0 | 6 | 1 | 1 | 3.71 | 72 |
| Kyle Ostrowski | 2021-2021 | .000 | 0 | 0 | 1 | 0 | 1 | 0.47 | 19 |
| Josh Outman | 2013-2013 | .000 | 0 | 0 | 0 | 0 | 0 | 2.45 | 5 |
| Chris Owings | 2012-2013 | .236 | 18 | 70 | 0 | 0 | 0 | 0.00 | 0 |
