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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 | 2019-2019 | 0 | 0 | .000 | 7.04 | 7 | 0 | 0 | 0 | 1 | 7.2 | 9 | 6 | 2 | 3 | 8 |
| Paul O'Callahan | 2015-2016 | 2 | 9 | .182 | 8.01 | 31 | 9 | 0 | 0 | 3 | 73.0 | 110 | 65 | 13 | 27 | 75 |
| Nathaniel O'Heyne | 2021-2022 | 1 | 1 | .500 | 3.70 | 9 | 0 | 0 | 0 | 0 | 24.1 | 22 | 10 | 2 | 10 | 21 |
| Homer O'Lannigan | 2018-2021 | 23 | 33 | .411 | 4.73 | 92 | 91 | 0 | 0 | 0 | 529.0 | 597 | 278 | 50 | 213 | 520 |
| Aaron O'Neill | 2019-2019 | 0 | 0 | .000 | 10.80 | 2 | 0 | 0 | 0 | 1 | 1.2 | 4 | 2 | 0 | 0 | 1 |
| Will O'Slattery | 2021-2025 | 2 | 5 | .286 | 4.67 | 39 | 4 | 0 | 0 | 7 | 52.0 | 58 | 27 | 7 | 23 | 32 |
| Héctor Ocampo | 2026-2027 | 10 | 16 | .385 | 4.56 | 44 | 40 | 1 | 1 | 0 | 254.1 | 238 | 129 | 16 | 158 | 183 |
| Floyd Oglethorpe | 2018-2018 | 0 | 1 | .000 | 8.78 | 5 | 5 | 0 | 0 | 0 | 26.2 | 43 | 26 | 5 | 9 | 31 |
| Ralph Ogstoun | 2023-2028 | 7 | 6 | .538 | 4.42 | 83 | 0 | 0 | 0 | 4 | 110.0 | 107 | 54 | 10 | 48 | 67 |
| Noburo Oishi | 2028-2028 | 12 | 2 | .857 | 2.07 | 20 | 20 | 0 | 0 | 0 | 117.1 | 77 | 27 | 3 | 27 | 124 |
| Luis Oliva | 2017-2022 | 9 | 6 | .600 | 5.26 | 66 | 23 | 0 | 0 | 4 | 159.0 | 193 | 93 | 19 | 73 | 131 |
| Jesús Olvero | 2028-2028 | 0 | 4 | .000 | 5.04 | 19 | 0 | 0 | 0 | 2 | 25.0 | 23 | 14 | 2 | 10 | 19 |
| Tzu-hsia Ong | 2026-2026 | 3 | 1 | .750 | 6.54 | 7 | 4 | 0 | 0 | 0 | 31.2 | 36 | 23 | 2 | 13 | 11 |
| Juan Ordóńez | 2027-2027 | 5 | 5 | .500 | 3.12 | 20 | 20 | 0 | 0 | 0 | 118.1 | 121 | 41 | 4 | 47 | 51 |
| Aurelio Ornelas | 2026-2028 | 12 | 12 | .500 | 5.28 | 97 | 0 | 0 | 0 | 49 | 102.1 | 101 | 60 | 6 | 64 | 91 |
| Jesús Orozco | 2025-2026 | 1 | 1 | .500 | 2.00 | 15 | 0 | 0 | 0 | 0 | 27.0 | 19 | 6 | 2 | 9 | 22 |
| Cisco Ortega | 2022-2028 | 11 | 9 | .550 | 3.75 | 106 | 0 | 0 | 0 | 46 | 134.1 | 128 | 56 | 7 | 101 | 104 |
| Eduardo Ortega | 2017-2017 | 0 | 0 | .000 | 4.50 | 2 | 0 | 0 | 0 | 0 | 4.0 | 6 | 2 | 1 | 2 | 6 |
| Lorenzo Ortega | 2016-2020 | 5 | 8 | .385 | 5.50 | 87 | 0 | 0 | 0 | 25 | 73.2 | 94 | 45 | 8 | 39 | 47 |
| Armando Ortíz | 2026-2026 | 0 | 0 | .000 | 1.59 | 4 | 0 | 0 | 0 | 0 | 5.2 | 4 | 1 | 1 | 2 | 7 |
| Carlos Ortíz | 2017-2019 | 2 | 5 | .286 | 6.50 | 63 | 0 | 0 | 0 | 2 | 70.2 | 93 | 51 | 9 | 49 | 60 |
| Cisco Ortíz | 2025-2028 | 26 | 11 | .703 | 3.31 | 55 | 49 | 1 | 1 | 1 | 342.1 | 327 | 126 | 22 | 109 | 263 |
| José Ortíz | 2024-2026 | 19 | 19 | .500 | 3.58 | 48 | 48 | 6 | 0 | 0 | 342.1 | 290 | 136 | 22 | 148 | 220 |
| Manuel Ortíz | 2016-2019 | 12 | 5 | .706 | 4.33 | 123 | 0 | 0 | 0 | 9 | 153.2 | 165 | 74 | 17 | 65 | 158 |
| Martin Ortíz | 2022-2025 | 2 | 4 | .333 | 4.45 | 37 | 1 | 0 | 0 | 2 | 60.2 | 71 | 30 | 2 | 26 | 42 |
| Jorge Otero | 2028-2028 | 12 | 8 | .600 | 3.45 | 23 | 23 | 4 | 1 | 0 | 167.0 | 144 | 64 | 18 | 64 | 142 |
| Yajirobei Otomo | 2025-2025 | 1 | 1 | .500 | 3.89 | 33 | 0 | 0 | 0 | 18 | 37.0 | 30 | 16 | 0 | 25 | 32 |
| Mike Owens | 2024-2024 | 2 | 2 | .500 | 2.23 | 7 | 7 | 0 | 0 | 0 | 48.1 | 30 | 12 | 3 | 12 | 31 |
| Doruk Oyan | 2015-2019 | 12 | 13 | .480 | 5.66 | 50 | 36 | 0 | 0 | 0 | 214.2 | 254 | 135 | 23 | 115 | 249 |
