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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 | 0-6 | 0 | 0 | .000 | 0.00 | 1 | 1 | 0 | 0 | 0 | 0.2 | 0 | 0 | 0 | 0 | 0 |
| Tom O'Dwyer | 0-6 | 2 | 1 | .667 | 3.29 | 30 | 0 | 0 | 0 | 1 | 38.1 | 35 | 14 | 2 | 16 | 38 |
| Hideyori Ohayashi | 0-2025 | 7 | 2 | .778 | 2.99 | 13 | 13 | 0 | 0 | 0 | 81.1 | 70 | 27 | 8 | 14 | 86 |
| Ed Ohler | 0-6 | 3 | 2 | .600 | 5.68 | 27 | 0 | 0 | 0 | 0 | 50.2 | 44 | 32 | 6 | 41 | 52 |
| Bernard Olivier | 0-6 | 1 | 6 | .143 | 6.65 | 34 | 0 | 0 | 0 | 3 | 43.1 | 55 | 32 | 6 | 39 | 43 |
| Tomás Ontiveros | 0-2022 | 6 | 2 | .750 | 3.52 | 11 | 11 | 0 | 0 | 0 | 61.1 | 59 | 24 | 6 | 19 | 53 |
| Roger Orr | 0-2025 | 3 | 3 | .500 | 3.64 | 13 | 12 | 0 | 0 | 0 | 66.2 | 59 | 27 | 7 | 28 | 81 |
| Lorenzo Ortega | 0-2024 | 4 | 0 | 1.000 | 4.03 | 24 | 0 | 0 | 0 | 12 | 22.1 | 33 | 10 | 2 | 7 | 22 |
| Paco Ortega | 0-2023 | 5 | 6 | .455 | 4.14 | 13 | 13 | 0 | 0 | 0 | 78.1 | 71 | 36 | 10 | 20 | 78 |
| Javier Ortíz | 0-2024 | 5 | 6 | .455 | 5.93 | 14 | 14 | 0 | 0 | 0 | 71.1 | 86 | 47 | 6 | 39 | 86 |
| John Ostrom | 0-2027 | 2 | 4 | .333 | 5.46 | 13 | 13 | 0 | 0 | 0 | 62.2 | 56 | 38 | 16 | 39 | 65 |
| Rick Otto | 0-6 | 2 | 3 | .400 | 6.75 | 19 | 4 | 0 | 0 | 0 | 45.1 | 57 | 34 | 10 | 19 | 45 |
| Al Owens | 0-6 | 1 | 4 | .200 | 11.85 | 19 | 0 | 0 | 0 | 2 | 13.2 | 23 | 18 | 4 | 10 | 17 |
| Randy Owry | 0-2028 | 3 | 2 | .600 | 3.86 | 15 | 14 | 0 | 0 | 0 | 67.2 | 74 | 29 | 12 | 15 | 86 |
