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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 | 0-0 | 0 | 2 | .000 | 3.18 | 13 | 1 | 0 | 0 | 0 | 34.0 | 40 | 12 | 1 | 15 | 8 |
| Gary O'Herlihy | 0-6 | 0 | 0 | .000 | 6.75 | 2 | 0 | 0 | 0 | 0 | 1.1 | 3 | 1 | 0 | 0 | 0 |
| Will O'Slattery | 0-2025 | 7 | 10 | .412 | 3.52 | 45 | 14 | 1 | 0 | 15 | 127.2 | 133 | 50 | 4 | 42 | 107 |
| Ralph Ogstoun | 0-2025 | 0 | 0 | .000 | 0.90 | 4 | 0 | 0 | 0 | 0 | 10.0 | 11 | 1 | 0 | 1 | 5 |
| Álex Olivarez | 0-0 | 0 | 0 | .000 | 4.76 | 4 | 0 | 0 | 0 | 0 | 5.2 | 5 | 3 | 0 | 2 | 2 |
| Robert Olson | 0-0 | 0 | 1 | .000 | 3.52 | 11 | 0 | 0 | 0 | 0 | 15.1 | 16 | 6 | 0 | 3 | 10 |
| Doppo Omikado | 0-4 | 6 | 5 | .545 | 2.31 | 44 | 0 | 0 | 0 | 19 | 58.1 | 38 | 15 | 0 | 33 | 83 |
| Tzu-hsia Ong | 0-2026 | 1 | 2 | .333 | 2.34 | 7 | 4 | 0 | 0 | 0 | 34.2 | 30 | 9 | 2 | 14 | 30 |
| Juan Ordóńez | 2-4 | 21 | 21 | .500 | 3.87 | 59 | 59 | 2 | 0 | 0 | 349.0 | 361 | 150 | 18 | 106 | 265 |
| Aurelio Ornelas | 0-2026 | 0 | 0 | .000 | 0.00 | 3 | 0 | 0 | 0 | 2 | 3.0 | 2 | 0 | 0 | 1 | 2 |
| Germán Orozco | 0-2024 | 5 | 0 | 1.000 | 3.08 | 20 | 0 | 0 | 0 | 5 | 38.0 | 40 | 13 | 2 | 17 | 32 |
| Jesús Orozco | 0-2024 | 3 | 1 | .750 | 2.28 | 25 | 1 | 0 | 0 | 2 | 27.2 | 15 | 7 | 2 | 12 | 40 |
| Armando Ortíz | 0-2026 | 5 | 2 | .714 | 2.01 | 8 | 7 | 1 | 0 | 0 | 58.1 | 40 | 13 | 4 | 7 | 61 |
| Carlos Ortíz | 0-4 | 5 | 1 | .833 | 4.83 | 24 | 0 | 0 | 0 | 0 | 54.0 | 66 | 29 | 2 | 34 | 48 |
| Cisco Ortíz | 0-2026 | 10 | 3 | .769 | 2.14 | 17 | 17 | 0 | 0 | 0 | 122.0 | 97 | 29 | 3 | 23 | 137 |
| Joaquín Ortíz | 0-6 | 0 | 1 | .000 | 8.31 | 2 | 0 | 0 | 0 | 1 | 4.1 | 5 | 4 | 0 | 3 | 3 |
| José Ortíz | 1-2026 | 13 | 18 | .419 | 2.96 | 43 | 43 | 10 | 2 | 0 | 295.0 | 266 | 97 | 7 | 109 | 226 |
| Martin Ortíz | 0-2026 | 0 | 0 | .000 | 6.46 | 9 | 1 | 0 | 0 | 2 | 15.1 | 17 | 11 | 3 | 9 | 9 |
| Jaime Osorio | 0-4 | 1 | 2 | .333 | 6.25 | 11 | 0 | 0 | 0 | 0 | 31.2 | 40 | 22 | 1 | 19 | 16 |
| Yajirobei Otomo | 0-2026 | 1 | 2 | .333 | 2.70 | 5 | 0 | 0 | 0 | 1 | 6.2 | 3 | 2 | 0 | 3 | 8 |
| Odemar Ouweneel | 0-0 | 5 | 2 | .714 | 3.35 | 23 | 0 | 0 | 0 | 2 | 37.2 | 33 | 14 | 2 | 18 | 42 |
| Jian-gang Ow-Yang | 1-4 | 11 | 3 | .786 | 3.05 | 56 | 12 | 0 | 0 | 5 | 150.2 | 125 | 51 | 9 | 59 | 142 |
| Mike Owens | 0-2025 | 5 | 7 | .417 | 2.82 | 16 | 16 | 0 | 0 | 0 | 99.0 | 79 | 31 | 3 | 35 | 99 |
