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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 | 2020-2023 | 0 | 2 | .000 | 3.18 | 13 | 1 | 0 | 0 | 0 | 34.0 | 40 | 12 | 1 | 15 | 8 |
| Gary O'Herlihy | 2023-2023 | 0 | 0 | .000 | 6.75 | 2 | 0 | 0 | 0 | 0 | 1.1 | 3 | 1 | 0 | 0 | 0 |
| Johnny O'Quinn | 2031-2031 | 1 | 2 | .333 | 5.00 | 15 | 0 | 0 | 0 | 2 | 27.0 | 33 | 15 | 3 | 14 | 24 |
| Will O'Slattery | 2022-2023 | 7 | 10 | .412 | 3.52 | 45 | 14 | 1 | 0 | 15 | 127.2 | 133 | 50 | 4 | 42 | 107 |
| Ricky O'Toole | 2029-2029 | 0 | 0 | .000 | 7.27 | 4 | 0 | 0 | 0 | 0 | 8.2 | 11 | 7 | 3 | 3 | 7 |
| Goodluck Obasanjo | 2028-2028 | 8 | 9 | .471 | 2.70 | 20 | 20 | 3 | 1 | 0 | 140.0 | 113 | 42 | 4 | 47 | 137 |
| Ramón Ocegueda | 2027-2028 | 3 | 0 | 1.000 | 0.84 | 31 | 0 | 0 | 0 | 3 | 32.0 | 19 | 3 | 1 | 10 | 48 |
| Robby Oglethorpe | 2028-2029 | 4 | 19 | .174 | 5.79 | 37 | 33 | 2 | 0 | 0 | 192.2 | 193 | 124 | 17 | 88 | 199 |
| Ralph Ogstoun | 2022-2022 | 0 | 0 | .000 | 0.90 | 4 | 0 | 0 | 0 | 0 | 10.0 | 11 | 1 | 0 | 1 | 5 |
| Idowu Okonjo | 2028-2029 | 0 | 2 | .000 | 3.03 | 19 | 0 | 0 | 0 | 1 | 32.2 | 31 | 11 | 0 | 16 | 39 |
| Álex Olivarez | 2021-2023 | 0 | 0 | .000 | 4.76 | 4 | 0 | 0 | 0 | 0 | 5.2 | 5 | 3 | 0 | 2 | 2 |
| Robert Olson | 2022-2023 | 0 | 1 | .000 | 3.52 | 11 | 0 | 0 | 0 | 0 | 15.1 | 16 | 6 | 0 | 3 | 10 |
| Doppo Omikado | 2026-2028 | 13 | 7 | .650 | 1.68 | 127 | 0 | 0 | 0 | 47 | 155.0 | 90 | 29 | 3 | 75 | 243 |
| Tzu-hsia Ong | 2026-2028 | 10 | 6 | .625 | 2.59 | 28 | 20 | 0 | 0 | 0 | 149.2 | 128 | 43 | 7 | 46 | 160 |
| Milan Opalka | 2030-2030 | 1 | 0 | 1.000 | 2.25 | 4 | 0 | 0 | 0 | 0 | 8.0 | 7 | 2 | 0 | 1 | 10 |
| Juan Ordóńez | 2024-2026 | 21 | 21 | .500 | 3.87 | 59 | 59 | 2 | 0 | 0 | 349.0 | 361 | 150 | 18 | 106 | 265 |
| Aurelio Ornelas | 2026-2029 | 3 | 1 | .750 | 1.53 | 26 | 0 | 0 | 0 | 5 | 29.1 | 15 | 5 | 0 | 10 | 41 |
| Román Ornelas | 2030-2030 | 3 | 4 | .429 | 1.31 | 38 | 0 | 0 | 0 | 21 | 41.1 | 20 | 6 | 2 | 13 | 62 |
| Germán Orozco | 2021-2023 | 5 | 0 | 1.000 | 3.08 | 20 | 0 | 0 | 0 | 5 | 38.0 | 40 | 13 | 2 | 17 | 32 |
| Jesús Orozco | 2025-2025 | 3 | 1 | .750 | 2.28 | 25 | 1 | 0 | 0 | 2 | 27.2 | 15 | 7 | 2 | 12 | 40 |
| Mike Orrsborne | 2029-2031 | 11 | 9 | .550 | 3.93 | 74 | 1 | 0 | 0 | 7 | 155.2 | 165 | 68 | 11 | 61 | 174 |
| Curt Orser | 2031-2031 | 4 | 4 | .500 | 2.41 | 36 | 0 | 0 | 0 | 9 | 41.0 | 27 | 11 | 1 | 21 | 51 |
| Alberto Ortíz | 2029-2031 | 11 | 8 | .579 | 2.54 | 62 | 0 | 0 | 0 | 10 | 131.0 | 119 | 37 | 6 | 54 | 159 |
| Armando Ortíz | 2026-2026 | 5 | 2 | .714 | 2.01 | 8 | 7 | 1 | 0 | 0 | 58.1 | 40 | 13 | 4 | 7 | 61 |
| Carlos Ortíz | 2026-2026 | 5 | 1 | .833 | 4.83 | 24 | 0 | 0 | 0 | 0 | 54.0 | 66 | 29 | 2 | 34 | 48 |
| Cisco Ortíz | 2024-2024 | 10 | 3 | .769 | 2.14 | 17 | 17 | 0 | 0 | 0 | 122.0 | 97 | 29 | 3 | 23 | 137 |
| Francisco Ortíz | 2031-2031 | 0 | 2 | .000 | 3.41 | 13 | 1 | 1 | 0 | 3 | 29.0 | 30 | 11 | 4 | 12 | 34 |
| Joaquín Ortíz | 2025-2025 | 0 | 1 | .000 | 8.31 | 2 | 0 | 0 | 0 | 1 | 4.1 | 5 | 4 | 0 | 3 | 3 |
| José Ortíz | 2023-2024 | 13 | 18 | .419 | 2.96 | 43 | 43 | 10 | 2 | 0 | 295.0 | 266 | 97 | 7 | 109 | 226 |
| Martin Ortíz | 2021-2023 | 0 | 0 | .000 | 6.46 | 9 | 1 | 0 | 0 | 2 | 15.1 | 17 | 11 | 3 | 9 | 9 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| Pedro Ortíz | 2030-2030 | 0 | 0 | .000 | 5.06 | 2 | 0 | 0 | 0 | 0 | 5.1 | 4 | 3 | 2 | 2 | 7 |
| Gus Osborne | 2031-2031 | 2 | 5 | .286 | 3.94 | 29 | 0 | 0 | 0 | 12 | 32.0 | 27 | 14 | 3 | 15 | 44 |
| Jaime Osorio | 2026-2027 | 2 | 2 | .500 | 5.12 | 16 | 0 | 0 | 0 | 1 | 38.2 | 44 | 22 | 1 | 22 | 23 |
| Jorge Otero | 2027-2027 | 7 | 8 | .467 | 3.19 | 23 | 19 | 1 | 0 | 0 | 141.0 | 137 | 50 | 2 | 55 | 126 |
| Yajirobei Otomo | 2025-2025 | 1 | 2 | .333 | 2.70 | 5 | 0 | 0 | 0 | 1 | 6.2 | 3 | 2 | 0 | 3 | 8 |
| Reino Öunap | 2030-2031 | 2 | 11 | .154 | 5.65 | 39 | 10 | 0 | 0 | 0 | 121.0 | 151 | 76 | 5 | 36 | 83 |
| Odemar Ouweneel | 2022-2022 | 5 | 2 | .714 | 3.35 | 23 | 0 | 0 | 0 | 2 | 37.2 | 33 | 14 | 2 | 18 | 42 |
| Kyle Overhill | 2030-2031 | 3 | 6 | .333 | 6.38 | 26 | 12 | 0 | 0 | 2 | 96.0 | 144 | 68 | 9 | 34 | 71 |
| Jian-gang Ow-Yang | 2024-2027 | 11 | 3 | .786 | 3.10 | 59 | 12 | 0 | 0 | 5 | 156.2 | 132 | 54 | 9 | 63 | 148 |
| Mike Owens | 2024-2024 | 5 | 7 | .417 | 2.82 | 16 | 16 | 0 | 0 | 0 | 99.0 | 79 | 31 | 3 | 35 | 99 |
