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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 | 0-2021 | 3 | 4 | .429 | 6.93 | 31 | 0 | 0 | 0 | 1 | 49.1 | 47 | 38 | 10 | 22 | 54 |
| Paul O'Callahan | 0-2025 | 2 | 1 | .667 | 2.45 | 3 | 3 | 2 | 0 | 0 | 22.0 | 18 | 6 | 1 | 4 | 13 |
| Nathaniel O'Heyne | 0-2022 | 4 | 5 | .444 | 5.79 | 20 | 7 | 0 | 0 | 0 | 60.2 | 67 | 39 | 7 | 44 | 40 |
| Carl O'Malloy | 1-2022 | 5 | 4 | .556 | 4.86 | 71 | 0 | 0 | 0 | 4 | 96.1 | 113 | 52 | 14 | 39 | 84 |
| Anderson O'Mara | 0-2026 | 1 | 1 | .500 | 7.04 | 5 | 0 | 0 | 0 | 0 | 7.2 | 8 | 6 | 2 | 4 | 2 |
| Ron O'Slattery | 6-2022 | 26 | 14 | .650 | 3.33 | 66 | 43 | 7 | 2 | 1 | 364.2 | 355 | 135 | 16 | 99 | 238 |
| Alin Oanta | 2-2027 | 10 | 6 | .625 | 4.70 | 34 | 34 | 1 | 1 | 0 | 166.2 | 181 | 87 | 16 | 85 | 144 |
| Taro Ohayashi | 0-2023 | 7 | 4 | .636 | 4.09 | 14 | 13 | 0 | 0 | 0 | 81.1 | 88 | 37 | 3 | 35 | 54 |
| Piotr Oja | 0-2 | 3 | 2 | .600 | 2.28 | 7 | 7 | 0 | 0 | 0 | 47.1 | 42 | 12 | 4 | 20 | 33 |
| Jesús Olvero | 0-2027 | 3 | 0 | 1.000 | 0.56 | 13 | 0 | 0 | 0 | 1 | 16.0 | 11 | 1 | 0 | 5 | 11 |
| Carlos Ortíz | 0-2022 | 14 | 12 | .538 | 5.27 | 32 | 32 | 3 | 0 | 0 | 222.0 | 259 | 130 | 21 | 101 | 112 |
| José Ortíz | -1-2020 | 7 | 17 | .292 | 5.94 | 94 | 0 | 0 | 0 | 40 | 97.0 | 123 | 64 | 11 | 51 | 57 |
| Luis Ortíz | 0-2027 | 2 | 10 | .167 | 5.30 | 23 | 21 | 0 | 0 | 0 | 91.2 | 107 | 54 | 11 | 38 | 51 |
| Pedro Ortíz | 0-2020 | 0 | 0 | .000 | 6.43 | 3 | 0 | 0 | 0 | 1 | 7.0 | 4 | 5 | 1 | 5 | 5 |
| Vincente Ortíz | 0-2027 | 1 | 5 | .167 | 6.04 | 27 | 0 | 0 | 0 | 15 | 28.1 | 33 | 19 | 2 | 12 | 20 |
| Andrew Osborne | 0-2017 | 6 | 7 | .462 | 6.25 | 19 | 13 | 1 | 0 | 0 | 85.0 | 112 | 59 | 11 | 54 | 31 |
| Mike Owens | 0-2027 | 8 | 8 | .500 | 3.56 | 21 | 21 | 1 | 0 | 0 | 131.1 | 116 | 52 | 3 | 64 | 91 |
