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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 | 0-2016 | 0 | 1 | .000 | 5.06 | 13 | 0 | 0 | 0 | 0 | 10.2 | 13 | 6 | 1 | 6 | 10 |
| Homer O'Lannigan | 1-2023 | 15 | 17 | .469 | 4.38 | 47 | 47 | 0 | 0 | 0 | 285.2 | 294 | 139 | 16 | 110 | 196 |
| Carl O'Malloy | 0-2022 | 2 | 4 | .333 | 5.21 | 36 | 0 | 0 | 0 | 1 | 48.1 | 47 | 28 | 11 | 19 | 48 |
| Aaron O'Neill | 0-2019 | 3 | 0 | 1.000 | 3.57 | 12 | 0 | 0 | 0 | 1 | 22.2 | 25 | 9 | 0 | 12 | 29 |
| Chris O'Toole | 0-0 | 1 | 2 | .333 | 3.72 | 27 | 2 | 0 | 0 | 0 | 19.1 | 28 | 8 | 1 | 7 | 15 |
| Héctor Ocampo | 0-3 | 4 | 7 | .364 | 3.78 | 17 | 15 | 2 | 1 | 0 | 112.0 | 110 | 47 | 11 | 63 | 89 |
| Taro Ohayashi | 0-2022 | 9 | 5 | .643 | 2.77 | 27 | 20 | 1 | 0 | 1 | 130.0 | 107 | 40 | 10 | 67 | 91 |
| Luis Oliva | -1-2022 | 2 | 5 | .286 | 5.59 | 68 | 0 | 0 | 0 | 1 | 75.2 | 97 | 47 | 9 | 32 | 59 |
| Ramón Oliveira | 0-0 | 0 | 0 | .000 | 3.68 | 3 | 0 | 0 | 0 | 3 | 7.1 | 5 | 3 | 2 | 3 | 4 |
| Emil Olsson | 0-2025 | 1 | 1 | .500 | 3.38 | 2 | 2 | 0 | 0 | 0 | 13.1 | 11 | 5 | 1 | 4 | 3 |
| Jesús Olvero | 0-2021 | 1 | 0 | 1.000 | 0.87 | 10 | 0 | 0 | 0 | 6 | 10.1 | 3 | 1 | 0 | 3 | 11 |
| Germán Orozco | 0-2024 | 1 | 7 | .125 | 4.98 | 13 | 0 | 0 | 0 | 1 | 34.1 | 35 | 19 | 2 | 18 | 15 |
| Jesús Orozco | 0-2025 | 0 | 0 | .000 | 6.60 | 7 | 0 | 0 | 0 | 0 | 15.0 | 24 | 11 | 0 | 8 | 8 |
| Cisco Ortega | 0-2023 | 0 | 0 | .000 | 1.23 | 4 | 0 | 0 | 0 | 0 | 7.1 | 5 | 1 | 0 | 8 | 4 |
| Eduardo Ortega | 0-2017 | 1 | 0 | 1.000 | 5.53 | 21 | 0 | 0 | 0 | 0 | 27.2 | 33 | 17 | 3 | 26 | 21 |
| Gerardo Ortega | 0-3 | 0 | 0 | .000 | 0.00 | 3 | 0 | 0 | 0 | 0 | 2.1 | 1 | 0 | 0 | 3 | 1 |
| Alberto Ortíz | 0-2015 | 0 | 0 | .000 | 2.61 | 11 | 0 | 0 | 0 | 0 | 10.1 | 14 | 3 | 0 | 6 | 8 |
| Carlos Ortíz | 0-2019 | 7 | 8 | .467 | 3.46 | 18 | 14 | 4 | 0 | 0 | 106.2 | 117 | 41 | 7 | 34 | 65 |
| José Ortíz | 0-2018 | 4 | 3 | .571 | 3.66 | 39 | 0 | 0 | 0 | 22 | 46.2 | 38 | 19 | 3 | 21 | 47 |
| Luis Ortíz | 0-2025 | 11 | 5 | .688 | 3.02 | 26 | 24 | 2 | 1 | 0 | 175.2 | 140 | 59 | 10 | 48 | 132 |
| Luis Ortíz | 0-2016 | 1 | 0 | 1.000 | 4.55 | 23 | 0 | 0 | 0 | 1 | 31.2 | 41 | 16 | 1 | 14 | 24 |
| Reynaldo Ortíz | 0-2020 | 3 | 8 | .273 | 5.20 | 14 | 14 | 0 | 0 | 0 | 90.0 | 102 | 52 | 9 | 38 | 67 |
| Mike Owens | 0-2025 | 1 | 5 | .167 | 4.83 | 11 | 11 | 0 | 0 | 0 | 50.1 | 52 | 27 | 5 | 27 | 36 |
| Doruk Oyan | 4-2025 | 22 | 21 | .512 | 3.43 | 60 | 60 | 3 | 0 | 0 | 373.0 | 352 | 142 | 21 | 182 | 334 |
