 |
|
|
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Denny O'Dugan | 2025-2025 | 0 | 1 | .000 | 13.50 | 6 | 0 | 0 | 0 | 2 | 9.1 | 17 | 14 | 2 | 9 | 11 |
| Jimmy O'Flahavan | 2028-2028 | 10 | 7 | .588 | 1.90 | 21 | 21 | 3 | 0 | 0 | 156.2 | 112 | 33 | 4 | 43 | 186 |
| Anderson O'Mara | 2024-2025 | 7 | 14 | .333 | 3.74 | 32 | 32 | 0 | 0 | 0 | 158.2 | 168 | 66 | 3 | 49 | 84 |
| Héctor Ocampo | 2020-2020 | 2 | 1 | .667 | 3.56 | 4 | 4 | 1 | 0 | 0 | 30.1 | 36 | 12 | 0 | 9 | 18 |
| Luis Ochoa | 2025-2028 | 3 | 3 | .500 | 1.89 | 39 | 0 | 0 | 0 | 8 | 52.1 | 32 | 11 | 2 | 21 | 65 |
| Piotr Oja | 2025-2026 | 8 | 7 | .533 | 2.83 | 25 | 19 | 1 | 0 | 2 | 136.2 | 111 | 43 | 3 | 52 | 154 |
| Kazuchika Okada | 2028-2028 | 8 | 7 | .533 | 3.14 | 17 | 17 | 2 | 0 | 0 | 120.1 | 114 | 42 | 4 | 31 | 92 |
| Ciprian Oprita | 2023-2023 | 0 | 1 | .000 | 8.44 | 5 | 0 | 0 | 0 | 0 | 5.1 | 9 | 5 | 0 | 5 | 3 |
| Marcos Oquendo | 2026-2026 | 12 | 5 | .706 | 2.40 | 26 | 26 | 2 | 1 | 0 | 176.0 | 134 | 47 | 8 | 57 | 168 |
| Hugo Ordiales | 2025-2026 | 0 | 0 | .000 | 3.41 | 12 | 0 | 0 | 0 | 0 | 29.0 | 23 | 11 | 2 | 10 | 31 |
| Juan Ordóńez | 2022-2022 | 5 | 3 | .625 | 4.79 | 32 | 1 | 0 | 0 | 1 | 62.0 | 78 | 33 | 2 | 38 | 47 |
| Luis Oropeza | 2027-2028 | 1 | 1 | .500 | 0.75 | 14 | 0 | 0 | 0 | 3 | 24.0 | 10 | 2 | 1 | 6 | 25 |
| Carlos Ortega | 2022-2026 | 21 | 14 | .600 | 2.69 | 67 | 45 | 0 | 0 | 7 | 324.1 | 266 | 97 | 14 | 108 | 370 |
| Alberto Ortíz | 2026-2028 | 6 | 1 | .857 | 1.36 | 33 | 0 | 0 | 0 | 4 | 46.1 | 18 | 7 | 2 | 21 | 45 |
| Carlos Ortíz | 2020-2020 | 1 | 0 | 1.000 | 1.42 | 1 | 1 | 0 | 0 | 0 | 6.1 | 7 | 1 | 0 | 2 | 7 |
| Luis Ortíz | 2021-2021 | 1 | 0 | 1.000 | 1.04 | 1 | 1 | 0 | 0 | 0 | 8.2 | 5 | 1 | 0 | 0 | 11 |
| Pancho Ortíz | 2026-2027 | 3 | 6 | .333 | 2.96 | 24 | 0 | 0 | 0 | 1 | 54.2 | 43 | 18 | 4 | 24 | 64 |
| Tony Ortíz | 2025-2025 | 1 | 0 | 1.000 | 0.87 | 3 | 0 | 0 | 0 | 0 | 10.1 | 10 | 1 | 0 | 5 | 7 |
| Vincente Ortíz | 2020-2021 | 4 | 3 | .571 | 3.96 | 43 | 0 | 0 | 0 | 15 | 38.2 | 39 | 17 | 1 | 20 | 21 |
| John Orton | 2022-2025 | 23 | 27 | .460 | 3.38 | 87 | 57 | 2 | 0 | 3 | 420.2 | 390 | 158 | 21 | 168 | 417 |
| Jesús Otero | 2023-2026 | 12 | 21 | .364 | 4.28 | 70 | 51 | 0 | 0 | 10 | 285.2 | 327 | 136 | 19 | 113 | 212 |
| Bill Oulton | 2020-2020 | 6 | 1 | .857 | 2.23 | 8 | 8 | 2 | 0 | 0 | 64.2 | 48 | 16 | 3 | 14 | 67 |
| Rich Overby | 2026-2026 | 1 | 0 | 1.000 | 2.20 | 6 | 0 | 0 | 0 | 0 | 16.1 | 12 | 4 | 1 | 11 | 17 |
| Clarence Oveur | 2026-2028 | 10 | 11 | .476 | 4.76 | 42 | 26 | 1 | 0 | 2 | 176.0 | 206 | 93 | 14 | 69 | 135 |
