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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 | 2021-2021 | 0 | 2 | .000 | 6.35 | 6 | 4 | 0 | 0 | 1 | 17.0 | 22 | 12 | 3 | 10 | 5 |
| Floyd Oglethorpe | 2018-2018 | 0 | 1 | .000 | 8.78 | 5 | 5 | 0 | 0 | 0 | 26.2 | 43 | 26 | 5 | 9 | 31 |
| Ralph Ogstoun | 2023-2023 | 1 | 2 | .333 | 4.41 | 9 | 0 | 0 | 0 | 0 | 16.1 | 13 | 8 | 0 | 8 | 7 |
| Luis Oliva | 2017-2022 | 9 | 6 | .600 | 5.26 | 66 | 23 | 0 | 0 | 4 | 159.0 | 193 | 93 | 19 | 73 | 131 |
| Cisco Ortega | 2022-2023 | 9 | 9 | .500 | 3.82 | 87 | 0 | 0 | 0 | 45 | 94.1 | 91 | 40 | 6 | 70 | 76 |
| 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 |
| Carlos Ortíz | 2017-2019 | 2 | 5 | .286 | 6.50 | 63 | 0 | 0 | 0 | 2 | 70.2 | 93 | 51 | 9 | 49 | 60 |
| Manuel Ortíz | 2016-2019 | 12 | 5 | .706 | 4.33 | 123 | 0 | 0 | 0 | 9 | 153.2 | 165 | 74 | 17 | 65 | 158 |
| Martin Ortíz | 2022-2023 | 1 | 2 | .333 | 6.00 | 12 | 1 | 0 | 0 | 1 | 21.0 | 27 | 14 | 1 | 14 | 10 |
| Doruk Oyan | 2015-2019 | 12 | 13 | .480 | 5.66 | 50 | 36 | 0 | 0 | 0 | 214.2 | 254 | 135 | 23 | 115 | 249 |
