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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 |
|---|---|---|---|---|---|---|---|---|---|
| Patrick O'Brien | 2020-2022 | .000 | 0 | 0 | 9 | 10 | 6 | 3.73 | 159 |
| Andy O'Gowan | 2022-2023 | .194 | 7 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Trent O'Hannon | 2017-2017 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| John O'Herlihy | 2020-2020 | .258 | 1 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Clayton O'Neil | 2019-2021 | .000 | 0 | 0 | 2 | 5 | 17 | 1.96 | 77 |
| Chris O'Reilly | 2023-2024 | .000 | 0 | 0 | 9 | 3 | 1 | 3.29 | 74 |
| Steven O'Toole | 2021-2021 | .260 | 2 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Aaron Oberkfel | 2020-2020 | .235 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Obeso | 2021-2021 | .000 | 0 | 0 | 2 | 3 | 0 | 5.55 | 20 |
| Pedro Ochoa | 2018-2019 | .207 | 7 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Ron Odom | 2019-2021 | .264 | 13 | 72 | 0 | 0 | 0 | 0.00 | 0 |
| Michael Ohlman | 2013-2013 | .333 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Jefferson Olacio | 2017-2017 | .000 | 0 | 0 | 1 | 8 | 5 | 4.00 | 96 |
| Roberto Oliva | 2020-2020 | .000 | 0 | 0 | 1 | 13 | 0 | 5.27 | 88 |
| George Olsen | 2021-2021 | .000 | 0 | 0 | 11 | 8 | 0 | 3.28 | 141 |
| Mat Olsen | 2024-2024 | .000 | 0 | 0 | 0 | 0 | 0 | 1.12 | 3 |
| Casey Opitz | 2022-2022 | .261 | 2 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Javier Ordóñez | 2024-2024 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 1 |
| Paul Orr | 2017-2017 | .000 | 0 | 0 | 14 | 3 | 0 | 1.90 | 174 |
| Cristo Ortega | 2021-2021 | .228 | 2 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Gabriel Ortega | 2020-2022 | .201 | 11 | 63 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Ortega | 2018-2020 | .000 | 0 | 0 | 5 | 3 | 4 | 2.92 | 109 |
| José Ortega | 2019-2020 | .000 | 0 | 0 | 7 | 14 | 0 | 4.40 | 149 |
| José Ortega | 2020-2020 | .250 | 2 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortega | 2019-2020 | .247 | 13 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Joseph Ortiz | 2012-2012 | .000 | 0 | 0 | 1 | 2 | 0 | 5.70 | 31 |
| José Ortíz | 2022-2023 | .000 | 0 | 0 | 4 | 6 | 0 | 4.59 | 97 |
| Ramón Ortíz | 2016-2017 | .240 | 17 | 61 | 0 | 0 | 0 | 0.00 | 0 |
| Sergio Ortíz | 2019-2021 | .000 | 0 | 0 | 2 | 11 | 0 | 4.78 | 102 |
| Josh Osich | 2012-2013 | .000 | 0 | 0 | 5 | 2 | 3 | 3.56 | 45 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Tyson Oswalt | 2019-2019 | .000 | 0 | 0 | 5 | 6 | 0 | 3.01 | 105 |
| Andy Otero | 2013-2014 | .000 | 0 | 0 | 6 | 6 | 0 | 3.69 | 84 |
| Matt Owen | 2019-2019 | .244 | 5 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Tyler Owens | 2020-2020 | .000 | 0 | 0 | 5 | 8 | 0 | 3.22 | 99 |
