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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 | 2021-2023 | .000 | 0 | 0 | 3 | 7 | 5 | 5.31 | 69 |
| Henry O'Day | 2017-2017 | .293 | 4 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| John O'Day | 2015-2015 | .000 | 0 | 0 | 5 | 8 | 0 | 4.73 | 105 |
| Ron O'Halloran | 2020-2023 | .207 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Trent O'Hannon | 2017-2017 | .242 | 4 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Dan O'Keefe | 2022-2023 | .000 | 0 | 0 | 13 | 16 | 0 | 4.79 | 98 |
| Dustin O'Neal | 2014-2014 | .269 | 9 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Bruce O'Slattery | 2018-2019 | .000 | 0 | 0 | 13 | 18 | 0 | 3.50 | 208 |
| Alex Oates | 2022-2023 | .298 | 13 | 92 | 0 | 0 | 0 | 0.00 | 3 |
| Nathan Oats | 2022-2022 | .251 | 7 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Aaron Oberkfel | 2020-2020 | .294 | 0 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Ochoa | 2020-2023 | .227 | 8 | 74 | 0 | 0 | 0 | 0.00 | 0 |
| Michael Ohlman | 2022-2022 | .260 | 7 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Wyatt Olds | 2023-2024 | .000 | 0 | 0 | 1 | 0 | 0 | 1.08 | 10 |
| Denny Oliver | 2022-2024 | .250 | 1 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Olson | 2024-2024 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Raymond Olson | 2018-2020 | .285 | 14 | 66 | 0 | 0 | 0 | 0.00 | 0 |
| Shane Opitz | 2014-2014 | .247 | 5 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Cody Orgeron | 2021-2021 | .287 | 11 | 52 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Orozco | 2020-2020 | .271 | 2 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Paul Orr | 2018-2018 | .000 | 0 | 0 | 10 | 10 | 0 | 3.62 | 158 |
| César Ortega | 2021-2021 | .288 | 3 | 52 | 0 | 0 | 0 | 0.00 | 0 |
| Gabriel Ortega | 2020-2020 | .211 | 2 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Ortega | 2019-2021 | .000 | 0 | 0 | 4 | 4 | 0 | 4.33 | 69 |
| José Ortega | 2020-2020 | .213 | 2 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Edgardo Ortíz | 2024-2024 | .259 | 1 | 3 | 0 | 0 | 0 | 2.25 | 4 |
| Pedro Ortíz | 2018-2022 | .000 | 0 | 0 | 1 | 3 | 0 | 4.32 | 52 |
| Ramón Ortíz | 2017-2017 | .219 | 15 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Victor Ortíz | 2016-2017 | .000 | 0 | 0 | 3 | 4 | 14 | 2.54 | 34 |
| Hiroya Oshima | 2015-2015 | .212 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Roberto Osuna | 2015-2015 | .000 | 0 | 0 | 2 | 12 | 0 | 5.07 | 143 |
| Tyson Oswalt | 2019-2020 | .000 | 0 | 0 | 2 | 1 | 0 | 1.45 | 12 |
| Tadaaki Otsuka | 2017-2017 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 1 |
| Bryan Owen | 2019-2022 | .283 | 28 | 79 | 2 | 1 | 0 | 3.61 | 35 |
| Tyler Owens | 2020-2022 | .000 | 0 | 0 | 12 | 13 | 0 | 3.83 | 203 |
