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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 | 2016-2021 | 3 | 4 | .429 | 6.93 | 31 | 0 | 0 | 0 | 1 | 49.1 | 47 | 38 | 10 | 22 | 54 |
| Paul O'Callahan | 2021-2022 | 2 | 1 | .667 | 2.45 | 3 | 3 | 2 | 0 | 0 | 22.0 | 18 | 6 | 1 | 4 | 13 |
| Nathaniel O'Heyne | 2022-2022 | 4 | 5 | .444 | 5.79 | 20 | 7 | 0 | 0 | 0 | 60.2 | 67 | 39 | 7 | 44 | 40 |
| Carl O'Malloy | 2020-2022 | 5 | 4 | .556 | 4.86 | 71 | 0 | 0 | 0 | 4 | 96.1 | 113 | 52 | 14 | 39 | 84 |
| Anderson O'Mara | 2026-2031 | 4 | 5 | .444 | 4.70 | 34 | 0 | 0 | 0 | 13 | 46.0 | 50 | 24 | 7 | 19 | 21 |
| Ron O'Slattery | 2015-2023 | 26 | 14 | .650 | 3.33 | 66 | 43 | 7 | 2 | 1 | 364.2 | 355 | 135 | 16 | 99 | 238 |
| Ricky O'Toole | 2032-2032 | 1 | 0 | 1.000 | 3.86 | 14 | 0 | 0 | 0 | 0 | 11.2 | 14 | 5 | 1 | 2 | 7 |
| Alin Oanta | 2019-2021 | 10 | 6 | .625 | 4.70 | 34 | 34 | 1 | 1 | 0 | 166.2 | 181 | 87 | 16 | 85 | 144 |
| Ramón Ocegueda | 2033-2033 | 1 | 1 | .500 | 6.00 | 4 | 0 | 0 | 0 | 0 | 6.0 | 6 | 4 | 0 | 4 | 7 |
| Luis Ochoa | 2028-2030 | 8 | 4 | .667 | 3.34 | 47 | 0 | 0 | 0 | 9 | 91.2 | 64 | 34 | 8 | 40 | 63 |
| Munemori Ohara | 2024-2032 | 0 | 0 | .000 | 7.71 | 1 | 0 | 0 | 0 | 0 | 2.1 | 5 | 2 | 0 | 3 | 1 |
| Taro Ohayashi | 2023-2023 | 7 | 4 | .636 | 4.09 | 14 | 13 | 0 | 0 | 0 | 81.1 | 88 | 37 | 3 | 35 | 54 |
| Piotr Oja | 2027-2030 | 20 | 14 | .588 | 3.44 | 51 | 51 | 0 | 0 | 0 | 327.0 | 282 | 125 | 27 | 138 | 281 |
| Jesús Olvero | 2021-2021 | 3 | 0 | 1.000 | 0.56 | 13 | 0 | 0 | 0 | 1 | 16.0 | 11 | 1 | 0 | 5 | 11 |
| Marcos Oquendo | 2029-2029 | 2 | 5 | .286 | 3.09 | 44 | 0 | 0 | 0 | 24 | 46.2 | 31 | 16 | 5 | 11 | 58 |
| Juan Ordóńez | 2029-2032 | 17 | 25 | .405 | 5.18 | 62 | 58 | 2 | 0 | 0 | 333.2 | 425 | 192 | 35 | 133 | 138 |
| Luis Oropeza | 2031-2031 | 4 | 2 | .667 | 5.51 | 24 | 0 | 0 | 0 | 3 | 49.0 | 58 | 30 | 5 | 26 | 44 |
| Ramón Ortega | 2028-2029 | 3 | 18 | .143 | 6.74 | 36 | 24 | 1 | 0 | 4 | 165.2 | 242 | 124 | 20 | 58 | 31 |
| Carlos Ortíz | 2020-2021 | 14 | 12 | .538 | 5.27 | 32 | 32 | 3 | 0 | 0 | 222.0 | 259 | 130 | 21 | 101 | 112 |
| José Ortíz | 2032-2032 | 3 | 0 | 1.000 | 1.52 | 18 | 3 | 1 | 1 | 0 | 59.1 | 45 | 10 | 2 | 25 | 20 |
| José Ortíz | 2019-2028 | 10 | 21 | .323 | 5.70 | 117 | 0 | 0 | 0 | 40 | 126.1 | 154 | 80 | 14 | 65 | 84 |
| Luis Ortíz | 2021-2022 | 2 | 10 | .167 | 5.30 | 23 | 21 | 0 | 0 | 0 | 91.2 | 107 | 54 | 11 | 38 | 51 |
| Pedro Ortíz | 2020-2020 | 0 | 0 | .000 | 6.43 | 3 | 0 | 0 | 0 | 1 | 7.0 | 4 | 5 | 1 | 5 | 5 |
| Vincente Ortíz | 2022-2031 | 8 | 12 | .400 | 5.48 | 82 | 2 | 0 | 0 | 22 | 139.2 | 196 | 85 | 6 | 60 | 90 |
| Richard Osborn | 2029-2033 | 7 | 8 | .467 | 6.26 | 40 | 10 | 0 | 0 | 14 | 92.0 | 126 | 64 | 17 | 42 | 58 |
| Andrew Osborne | 2015-2016 | 6 | 7 | .462 | 6.25 | 19 | 13 | 1 | 0 | 0 | 85.0 | 112 | 59 | 11 | 54 | 31 |
| Mike Owens | 2027-2029 | 23 | 20 | .535 | 4.31 | 58 | 58 | 1 | 0 | 0 | 344.1 | 333 | 165 | 21 | 187 | 255 |
