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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Paul O'Callahan | 2023-2023 | 0 | 1 | .000 | 5.06 | 13 | 0 | 0 | 0 | 0 | 10.2 | 13 | 6 | 1 | 6 | 10 |
| Vincent O'Higgin | 2028-2028 | 1 | 5 | .167 | 5.24 | 7 | 7 | 0 | 0 | 0 | 46.1 | 42 | 27 | 1 | 26 | 33 |
| Homer O'Lannigan | 2022-2023 | 15 | 17 | .469 | 4.38 | 47 | 47 | 0 | 0 | 0 | 285.2 | 294 | 139 | 16 | 110 | 196 |
| Carl O'Malloy | 2015-2016 | 2 | 4 | .333 | 5.21 | 36 | 0 | 0 | 0 | 1 | 48.1 | 47 | 28 | 11 | 19 | 48 |
| Aaron O'Neill | 2015-2015 | 3 | 0 | 1.000 | 3.57 | 12 | 0 | 0 | 0 | 1 | 22.2 | 25 | 9 | 0 | 12 | 29 |
| Will O'Slattery | 2028-2028 | 1 | 0 | 1.000 | 3.00 | 20 | 0 | 0 | 0 | 0 | 36.0 | 27 | 12 | 3 | 11 | 32 |
| Chris O'Toole | 2021-2023 | 1 | 2 | .333 | 3.72 | 27 | 2 | 0 | 0 | 0 | 19.1 | 28 | 8 | 1 | 7 | 15 |
| Héctor Ocampo | 2025-2028 | 4 | 7 | .364 | 4.08 | 24 | 15 | 2 | 1 | 0 | 136.2 | 139 | 62 | 16 | 73 | 114 |
| Ramón Ocegueda | 2029-2029 | 9 | 4 | .692 | 3.47 | 21 | 21 | 0 | 0 | 0 | 124.2 | 113 | 48 | 2 | 70 | 89 |
| Taro Ohayashi | 2021-2022 | 9 | 5 | .643 | 2.77 | 27 | 20 | 1 | 0 | 1 | 130.0 | 107 | 40 | 10 | 67 | 91 |
| Luis Oliva | 2016-2021 | 2 | 5 | .286 | 5.59 | 68 | 0 | 0 | 0 | 1 | 75.2 | 97 | 47 | 9 | 32 | 59 |
| Ramón Oliveira | 2020-2020 | 0 | 0 | .000 | 3.68 | 3 | 0 | 0 | 0 | 3 | 7.1 | 5 | 3 | 2 | 3 | 4 |
| Emil Olsson | 2025-2025 | 1 | 1 | .500 | 3.38 | 2 | 2 | 0 | 0 | 0 | 13.1 | 11 | 5 | 1 | 4 | 3 |
| Jesús Olvero | 2020-2020 | 1 | 0 | 1.000 | 0.87 | 10 | 0 | 0 | 0 | 6 | 10.1 | 3 | 1 | 0 | 3 | 11 |
| Doppo Omikado | 2029-2029 | 5 | 2 | .714 | 2.01 | 26 | 0 | 0 | 0 | 3 | 44.2 | 31 | 10 | 1 | 24 | 40 |
| Milan Opalka | 2028-2028 | 0 | 2 | .000 | 6.75 | 11 | 0 | 0 | 0 | 0 | 17.1 | 23 | 13 | 0 | 13 | 8 |
| Germán Orozco | 2024-2024 | 1 | 7 | .125 | 4.98 | 13 | 0 | 0 | 0 | 1 | 34.1 | 35 | 19 | 2 | 18 | 15 |
| Jesús Orozco | 2024-2024 | 0 | 0 | .000 | 6.60 | 7 | 0 | 0 | 0 | 0 | 15.0 | 24 | 11 | 0 | 8 | 8 |
| Cisco Ortega | 2025-2027 | 4 | 1 | .800 | 2.17 | 37 | 0 | 0 | 0 | 1 | 58.0 | 42 | 14 | 1 | 39 | 44 |
| Eduardo Ortega | 2016-2017 | 1 | 0 | 1.000 | 5.53 | 21 | 0 | 0 | 0 | 0 | 27.2 | 33 | 17 | 3 | 26 | 21 |
| Gerardo Ortega | 2025-2025 | 0 | 0 | .000 | 0.00 | 3 | 0 | 0 | 0 | 0 | 2.1 | 1 | 0 | 0 | 3 | 1 |
| Alberto Ortíz | 2015-2015 | 0 | 0 | .000 | 2.61 | 11 | 0 | 0 | 0 | 0 | 10.1 | 14 | 3 | 0 | 6 | 8 |
| Carlos Ortíz | 2023-2023 | 7 | 8 | .467 | 3.46 | 18 | 14 | 4 | 0 | 0 | 106.2 | 117 | 41 | 7 | 34 | 65 |
| José Ortíz | 2022-2022 | 4 | 3 | .571 | 3.66 | 39 | 0 | 0 | 0 | 22 | 46.2 | 38 | 19 | 3 | 21 | 47 |
| Luis Ortíz | 2020-2026 | 21 | 15 | .583 | 3.09 | 48 | 46 | 4 | 1 | 0 | 337.1 | 278 | 116 | 23 | 100 | 261 |
| Luis Ortíz | 2015-2016 | 1 | 0 | 1.000 | 4.55 | 23 | 0 | 0 | 0 | 1 | 31.2 | 41 | 16 | 1 | 14 | 24 |
| Martin Ortíz | 2026-2027 | 1 | 0 | 1.000 | 1.82 | 12 | 0 | 0 | 0 | 0 | 34.2 | 21 | 7 | 1 | 16 | 19 |
| Reynaldo Ortíz | 2020-2020 | 3 | 8 | .273 | 5.20 | 14 | 14 | 0 | 0 | 0 | 90.0 | 102 | 52 | 9 | 38 | 67 |
| Yajirobei Otomo | 2026-2026 | 3 | 2 | .600 | 1.41 | 26 | 0 | 0 | 0 | 15 | 32.0 | 18 | 5 | 1 | 26 | 41 |
| Mike Owens | 2025-2025 | 1 | 5 | .167 | 4.83 | 11 | 11 | 0 | 0 | 0 | 50.1 | 52 | 27 | 5 | 27 | 36 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| Doruk Oyan | 2020-2022 | 22 | 21 | .512 | 3.43 | 60 | 60 | 3 | 0 | 0 | 373.0 | 352 | 142 | 21 | 182 | 334 |
