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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jack O'Connor | 2022-2022 | 0 | 0 | .000 | 1.29 | 2 | 2 | 0 | 0 | 0 | 7.0 | 7 | 1 | 1 | 3 | 5 |
| Dan O'Keefe | 2020-2021 | 3 | 6 | .333 | 4.86 | 18 | 18 | 0 | 0 | 0 | 79.2 | 88 | 43 | 1 | 40 | 50 |
| Aaron Oberkfel | 2019-2020 | 1 | 0 | 1.000 | 0.00 | 3 | 0 | 0 | 0 | 1 | 2.1 | 1 | 0 | 0 | 0 | 2 |
| Ryan Och | 2022-2022 | 0 | 1 | .000 | 9.26 | 13 | 0 | 0 | 0 | 0 | 11.2 | 12 | 12 | 2 | 11 | 5 |
| Roy Offerman | 2018-2021 | 13 | 4 | .765 | 2.77 | 36 | 17 | 3 | 1 | 7 | 165.2 | 132 | 51 | 13 | 37 | 142 |
| Braeden Ogle | 2021-2021 | 0 | 1 | .000 | 6.07 | 15 | 0 | 0 | 0 | 10 | 13.1 | 14 | 9 | 2 | 6 | 23 |
| Jefferson Olacio | 2012-2012 | 0 | 0 | .000 | 1.59 | 2 | 2 | 0 | 0 | 0 | 11.1 | 7 | 2 | 1 | 7 | 13 |
| Pat Olson | 2018-2019 | 6 | 6 | .500 | 2.35 | 32 | 13 | 1 | 0 | 8 | 107.1 | 90 | 28 | 3 | 40 | 108 |
| Javier Ordóñez | 2021-2022 | 2 | 1 | .667 | 3.35 | 15 | 0 | 0 | 0 | 2 | 37.2 | 26 | 14 | 5 | 17 | 48 |
| Paul Orr | 2014-2015 | 7 | 10 | .412 | 6.53 | 26 | 26 | 0 | 0 | 0 | 131.0 | 128 | 95 | 11 | 100 | 131 |
| José Ortega | 2019-2019 | 1 | 1 | .500 | 4.39 | 6 | 6 | 0 | 0 | 0 | 26.2 | 28 | 13 | 2 | 12 | 18 |
| Alejandro Ortíz | 2022-2022 | 1 | 2 | .333 | 2.08 | 15 | 0 | 0 | 0 | 0 | 30.1 | 17 | 7 | 1 | 12 | 25 |
| Kiyoshi Oshima | 2021-2021 | 0 | 0 | .000 | 0.00 | 2 | 0 | 0 | 0 | 0 | 3.0 | 1 | 0 | 0 | 6 | 5 |
| Roberto Osuna | 2013-2013 | 0 | 0 | .000 | 1.29 | 1 | 1 | 0 | 0 | 0 | 7.0 | 4 | 1 | 1 | 2 | 6 |
| Andy Otero | 2013-2013 | 0 | 0 | .000 | 0.00 | 4 | 0 | 0 | 0 | 0 | 2.0 | 0 | 0 | 0 | 3 | 3 |
| Teo Ottenhof | 2013-2015 | 6 | 3 | .667 | 4.39 | 66 | 0 | 0 | 0 | 8 | 67.2 | 54 | 33 | 5 | 49 | 98 |
| Tyler Owens | 2019-2019 | 7 | 3 | .700 | 3.65 | 12 | 12 | 0 | 0 | 0 | 69.0 | 68 | 28 | 5 | 31 | 48 |
