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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chi-hun O | 2021-2022 | 1 | 0 | 1.000 | 1.35 | 10 | 0 | 0 | 0 | 1 | 6.2 | 6 | 1 | 0 | 1 | 4 |
| Taro Ohayashi | 2020-2020 | 7 | 5 | .583 | 2.55 | 30 | 11 | 1 | 0 | 0 | 102.1 | 74 | 29 | 4 | 34 | 79 |
| Luis Oliva | 2020-2020 | 0 | 0 | .000 | 3.38 | 5 | 0 | 0 | 0 | 0 | 2.2 | 3 | 1 | 0 | 2 | 1 |
| Ramón Oliveira | 2020-2021 | 2 | 6 | .250 | 7.28 | 13 | 8 | 0 | 0 | 0 | 59.1 | 90 | 48 | 1 | 15 | 37 |
| Robert Olson | 2021-2021 | 0 | 0 | .000 | 4.19 | 6 | 0 | 0 | 0 | 0 | 19.1 | 24 | 9 | 0 | 4 | 13 |
| Germán Orozco | 2020-2020 | 3 | 2 | .600 | 2.37 | 23 | 0 | 0 | 0 | 5 | 38.0 | 32 | 10 | 1 | 22 | 31 |
| Cisco Ortega | 2021-2021 | 0 | 1 | .000 | 2.59 | 13 | 2 | 1 | 0 | 1 | 31.1 | 27 | 9 | 0 | 12 | 16 |
| Armando Ortíz | 2021-2022 | 12 | 6 | .667 | 3.16 | 26 | 18 | 2 | 0 | 0 | 153.2 | 138 | 54 | 7 | 44 | 140 |
| Reynaldo Ortíz | 2020-2020 | 0 | 0 | .000 | 1.12 | 1 | 1 | 0 | 0 | 0 | 8.0 | 4 | 1 | 0 | 3 | 9 |
| Odemar Ouweneel | 2021-2021 | 3 | 1 | .750 | 0.57 | 37 | 0 | 0 | 0 | 11 | 31.2 | 14 | 2 | 1 | 8 | 39 |
