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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 | 2018-2022 | .250 | 9 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Robert O'Connor | 2018-2018 | .297 | 15 | 49 | 0 | 1 | 0 | 67.50 | 2 |
| Christian O'Dell | 2019-2023 | .263 | 29 | 149 | 0 | 0 | 0 | 0.00 | 0 |
| Warren O'Herlihy | 2017-2017 | .285 | 14 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Carl O'Malloy | 2016-2019 | .000 | 0 | 0 | 3 | 5 | 2 | 5.37 | 125 |
| Christian O'Neal | 2017-2023 | .283 | 11 | 84 | 0 | 0 | 0 | 0.00 | 0 |
| Aaron O'Neill | 2017-2022 | .000 | 0 | 0 | 4 | 3 | 0 | 4.48 | 40 |
| Eric O'Neill | 2022-2022 | .280 | 2 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Ron O'Slattery | 2022-2024 | .000 | 0 | 0 | 3 | 5 | 0 | 4.19 | 26 |
| Alin Oanta | 2020-2024 | .000 | 0 | 0 | 23 | 22 | 0 | 3.91 | 370 |
| Floyd Oglethorpe | 2015-2016 | .000 | 0 | 0 | 5 | 13 | 0 | 7.70 | 119 |
| Munemori Ohara | 2019-2020 | .304 | 11 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Taro Ohayashi | 2022-2022 | .000 | 0 | 0 | 3 | 5 | 0 | 3.93 | 27 |
| Brian Olivares | 2020-2020 | .288 | 4 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Cipriano Oliveira | 2015-2021 | .327 | 2 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Richard Ollivier | 2015-2021 | .333 | 28 | 123 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Olvero | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 2 |
| Mike Ontiveros | 2022-2022 | 1.000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Orozco | 2018-2019 | .280 | 16 | 69 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortega | 2023-2023 | .311 | 15 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Eduardo Ortega | 2016-2016 | .000 | 0 | 0 | 0 | 0 | 0 | 7.36 | 7 |
| Francisco Ortega | 2018-2019 | .326 | 15 | 77 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortega | 2023-2023 | .167 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Leonardo Ortega | 2018-2018 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Alberto Ortíz | 2017-2017 | .000 | 0 | 0 | 1 | 7 | 21 | 4.98 | 39 |
| Carlos Ortíz | 2022-2022 | .000 | 0 | 0 | 4 | 8 | 0 | 8.28 | 45 |
| Emílio Ortíz | 2020-2022 | .268 | 4 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ortíz | 2016-2016 | .000 | 0 | 0 | 3 | 0 | 1 | 7.99 | 24 |
| Reynaldo Ortíz | 2020-2021 | .000 | 0 | 0 | 6 | 11 | 0 | 4.14 | 114 |
| Andrew Osborne | 2017-2017 | .000 | 0 | 0 | 1 | 3 | 0 | 7.47 | 34 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Ken Osborne | 2015-2024 | .300 | 5 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Oulton | 2021-2021 | .000 | 0 | 0 | 1 | 2 | 0 | 6.12 | 23 |
