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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mark O'Connor | 2027-2027 | 0 | 0 | .000 | 0.00 | 1 | 1 | 0 | 0 | 0 | 0.2 | 0 | 0 | 0 | 0 | 0 |
| Hideyori Ohayashi | 2019-2019 | 7 | 2 | .778 | 2.99 | 13 | 13 | 0 | 0 | 0 | 81.1 | 70 | 27 | 8 | 14 | 86 |
| Gary Ohler | 2031-2031 | 1 | 1 | .500 | 6.89 | 11 | 0 | 0 | 0 | 2 | 15.2 | 19 | 12 | 3 | 4 | 16 |
| Tomás Ontiveros | 2021-2021 | 6 | 2 | .750 | 3.52 | 11 | 11 | 0 | 0 | 0 | 61.1 | 59 | 24 | 6 | 19 | 53 |
| Keith Ormon | 2032-2032 | 0 | 0 | .000 | 8.28 | 10 | 0 | 0 | 0 | 3 | 25.0 | 28 | 23 | 6 | 17 | 20 |
| Roger Orr | 2024-2024 | 3 | 3 | .500 | 3.64 | 13 | 12 | 0 | 0 | 0 | 66.2 | 59 | 27 | 7 | 28 | 81 |
| Lorenzo Ortega | 2021-2021 | 4 | 0 | 1.000 | 4.03 | 24 | 0 | 0 | 0 | 12 | 22.1 | 33 | 10 | 2 | 7 | 22 |
| Paco Ortega | 2022-2022 | 5 | 6 | .455 | 4.14 | 13 | 13 | 0 | 0 | 0 | 78.1 | 71 | 36 | 10 | 20 | 78 |
| Javier Ortíz | 2022-2022 | 5 | 6 | .455 | 5.93 | 14 | 14 | 0 | 0 | 0 | 71.1 | 86 | 47 | 6 | 39 | 86 |
| John Ostrom | 2025-2025 | 2 | 4 | .333 | 5.46 | 13 | 13 | 0 | 0 | 0 | 62.2 | 56 | 38 | 16 | 39 | 65 |
| Takeshi Osumi | 2032-2032 | 1 | 0 | 1.000 | 2.25 | 4 | 0 | 0 | 0 | 0 | 8.0 | 7 | 2 | 0 | 4 | 7 |
| Don Owry | 2030-2030 | 1 | 3 | .250 | 8.75 | 11 | 11 | 0 | 0 | 0 | 48.1 | 66 | 47 | 13 | 33 | 35 |
| Randy Owry | 2025-2025 | 3 | 2 | .600 | 3.86 | 15 | 14 | 0 | 0 | 0 | 67.2 | 74 | 29 | 12 | 15 | 86 |
| Tommy Owry | 2031-2031 | 1 | 0 | 1.000 | 4.39 | 6 | 6 | 0 | 0 | 0 | 26.2 | 24 | 13 | 6 | 14 | 30 |
| Ken Oxford | 2032-2032 | 1 | 0 | 1.000 | 3.18 | 14 | 0 | 0 | 0 | 0 | 22.2 | 25 | 8 | 2 | 8 | 28 |
