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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 |
| Matt O'Keevan | 2033-2033 | 4 | 2 | .667 | 4.22 | 10 | 10 | 0 | 0 | 0 | 64.0 | 67 | 30 | 6 | 10 | 62 |
| 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 |
| Robby Oglethorpe | 2031-2032 | 14 | 9 | .609 | 3.20 | 42 | 42 | 0 | 0 | 0 | 222.0 | 189 | 79 | 6 | 75 | 272 |
| Piotr Oja | 2025-2026 | 8 | 7 | .533 | 2.83 | 25 | 19 | 1 | 0 | 2 | 136.2 | 111 | 43 | 3 | 52 | 154 |
| Kazuchika Okada | 2028-2029 | 14 | 9 | .609 | 2.94 | 32 | 28 | 3 | 0 | 1 | 199.0 | 188 | 65 | 8 | 52 | 174 |
| Ainanani Oliwa | 2031-2032 | 9 | 9 | .500 | 2.78 | 117 | 0 | 0 | 0 | 39 | 191.1 | 141 | 59 | 9 | 71 | 255 |
| Satoshi Ono | 2029-2030 | 6 | 6 | .500 | 2.40 | 16 | 16 | 1 | 0 | 0 | 112.2 | 95 | 30 | 6 | 35 | 130 |
| 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 |
| Román Ornelas | 2032-2033 | 8 | 8 | .500 | 3.22 | 41 | 16 | 1 | 1 | 13 | 128.2 | 90 | 46 | 8 | 42 | 145 |
| Luis Oropeza | 2027-2029 | 2 | 1 | .667 | 1.32 | 36 | 0 | 0 | 0 | 6 | 68.0 | 29 | 10 | 1 | 22 | 87 |
| Curt Orser | 2029-2029 | 3 | 3 | .500 | 2.21 | 27 | 2 | 0 | 0 | 1 | 40.2 | 27 | 10 | 1 | 13 | 52 |
| Carlos Ortega | 2022-2026 | 21 | 14 | .600 | 2.69 | 67 | 45 | 0 | 0 | 7 | 324.1 | 266 | 97 | 14 | 108 | 370 |
| David Ortega | 2030-2030 | 0 | 2 | .000 | 2.18 | 19 | 0 | 0 | 0 | 8 | 20.2 | 24 | 5 | 1 | 4 | 30 |
| 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 |
| Royce Ortíz | 2032-2032 | 2 | 2 | .500 | 5.62 | 13 | 0 | 0 | 0 | 1 | 24.0 | 32 | 15 | 5 | 14 | 18 |
| 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 |
| António Osorio | 2030-2033 | 6 | 7 | .462 | 3.71 | 44 | 0 | 0 | 0 | 6 | 85.0 | 85 | 35 | 4 | 37 | 107 |
| Alfred Osuch | 2031-2033 | 23 | 18 | .561 | 3.26 | 73 | 42 | 2 | 1 | 3 | 306.1 | 286 | 111 | 20 | 106 | 294 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| 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 |
| Giel Overwater | 2029-2031 | 17 | 6 | .739 | 2.29 | 37 | 36 | 0 | 0 | 0 | 224.1 | 169 | 57 | 10 | 73 | 229 |
| Clarence Oveur | 2026-2029 | 10 | 11 | .476 | 4.64 | 47 | 26 | 1 | 0 | 2 | 184.1 | 211 | 95 | 14 | 71 | 146 |
