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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ju-hyung O | 2016-2020 | 0 | 2 | .000 | 6.14 | 5 | 0 | 0 | 0 | 0 | 7.1 | 11 | 5 | 0 | 4 | 9 |
| Carl O'Malloy | 2023-2024 | 8 | 6 | .571 | 2.06 | 82 | 0 | 0 | 0 | 7 | 78.2 | 55 | 18 | 5 | 34 | 71 |
| Anderson O'Mara | 2025-2025 | 2 | 2 | .500 | 2.22 | 10 | 10 | 0 | 0 | 0 | 44.2 | 44 | 11 | 0 | 9 | 18 |
| Aaron O'Neill | 2023-2023 | 2 | 2 | .500 | 2.98 | 36 | 4 | 0 | 0 | 16 | 57.1 | 59 | 19 | 5 | 18 | 16 |
| Ed O'Quinn | 2026-2027 | 17 | 13 | .567 | 3.76 | 45 | 45 | 1 | 1 | 0 | 285.0 | 269 | 119 | 28 | 117 | 200 |
| Ron O'Slattery | 2015-2015 | 1 | 0 | 1.000 | 1.08 | 2 | 1 | 0 | 0 | 0 | 8.1 | 11 | 1 | 0 | 5 | 6 |
| Chris O'Toole | 2020-2020 | 0 | 0 | .000 | 1.50 | 15 | 0 | 0 | 0 | 0 | 6.0 | 6 | 1 | 0 | 2 | 3 |
| Ricky O'Toole | 2030-2030 | 7 | 6 | .538 | 3.12 | 34 | 0 | 0 | 0 | 9 | 43.1 | 42 | 15 | 5 | 21 | 35 |
| Alin Oanta | 2017-2018 | 11 | 9 | .550 | 5.51 | 28 | 24 | 0 | 0 | 0 | 125.2 | 153 | 77 | 8 | 62 | 87 |
| Héctor Ocampo | 2020-2024 | 10 | 21 | .323 | 5.15 | 65 | 39 | 3 | 0 | 1 | 299.0 | 333 | 171 | 18 | 180 | 193 |
| Luis Ochoa | 2025-2029 | 8 | 6 | .571 | 3.48 | 53 | 0 | 0 | 0 | 7 | 62.0 | 52 | 24 | 4 | 24 | 51 |
| Piotr Oja | 2027-2027 | 7 | 4 | .636 | 2.76 | 14 | 14 | 0 | 0 | 0 | 101.0 | 81 | 31 | 5 | 33 | 93 |
| Kazuchika Okada | 2029-2030 | 1 | 8 | .111 | 8.72 | 15 | 15 | 0 | 0 | 0 | 64.0 | 96 | 62 | 5 | 45 | 23 |
| Jesús Olvero | 2016-2019 | 11 | 6 | .647 | 4.22 | 150 | 0 | 0 | 0 | 11 | 151.1 | 137 | 71 | 18 | 84 | 186 |
| Satoshi Ono | 2030-2030 | 1 | 0 | 1.000 | 2.45 | 2 | 0 | 0 | 0 | 0 | 7.1 | 6 | 2 | 1 | 4 | 8 |
| Marcos Oquendo | 2027-2028 | 14 | 18 | .438 | 5.33 | 45 | 35 | 1 | 0 | 4 | 238.0 | 252 | 141 | 24 | 118 | 170 |
| Luis Oropeza | 2030-2030 | 6 | 0 | 1.000 | 1.22 | 31 | 0 | 0 | 0 | 4 | 51.2 | 33 | 7 | 2 | 21 | 53 |
| Carlos Ortega | 2023-2027 | 2 | 2 | .500 | 5.23 | 18 | 9 | 0 | 0 | 2 | 65.1 | 70 | 38 | 8 | 38 | 55 |
| Cisco Ortega | 2024-2024 | 1 | 2 | .333 | 7.84 | 8 | 0 | 0 | 0 | 1 | 10.1 | 16 | 9 | 1 | 6 | 6 |
| José Ortíz | 2016-2018 | 7 | 11 | .389 | 5.81 | 88 | 0 | 0 | 0 | 6 | 79.0 | 104 | 51 | 11 | 54 | 83 |
| Luis Ortíz | 2016-2024 | 15 | 16 | .484 | 3.60 | 138 | 43 | 4 | 0 | 9 | 372.1 | 379 | 149 | 34 | 138 | 301 |
| Pancho Ortíz | 2028-2029 | 1 | 1 | .500 | 3.86 | 5 | 0 | 0 | 0 | 0 | 14.0 | 11 | 6 | 0 | 9 | 11 |
| Vincente Ortíz | 2021-2022 | 5 | 6 | .455 | 4.81 | 41 | 0 | 0 | 0 | 16 | 43.0 | 46 | 23 | 1 | 27 | 17 |
| John Orton | 2026-2028 | 0 | 0 | .000 | 2.92 | 14 | 0 | 0 | 0 | 0 | 12.1 | 12 | 4 | 0 | 15 | 7 |
| Richard Osborn | 2028-2028 | 2 | 4 | .333 | 3.35 | 38 | 0 | 0 | 0 | 21 | 37.2 | 34 | 14 | 6 | 15 | 39 |
| Jesús Otero | 2026-2028 | 10 | 6 | .625 | 2.60 | 37 | 25 | 0 | 0 | 3 | 152.1 | 135 | 44 | 10 | 73 | 127 |
| Bill Oulton | 2020-2020 | 5 | 6 | .455 | 2.90 | 17 | 17 | 1 | 0 | 0 | 118.0 | 98 | 38 | 4 | 45 | 115 |
| Rich Overby | 2026-2026 | 0 | 0 | .000 | 11.74 | 4 | 0 | 0 | 0 | 0 | 7.2 | 14 | 10 | 2 | 5 | 7 |
| Doruk Oyan | 2023-2025 | 13 | 15 | .464 | 4.40 | 60 | 39 | 1 | 0 | 0 | 278.1 | 271 | 136 | 28 | 153 | 217 |
