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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chi-hun O | 2021-2022 | 1 | 0 | 1.000 | 1.35 | 10 | 0 | 0 | 0 | 1 | 6.2 | 6 | 1 | 0 | 1 | 4 |
| Gary O'Herlihy | 2024-2024 | 0 | 0 | .000 | 8.44 | 3 | 0 | 0 | 0 | 0 | 5.1 | 12 | 5 | 2 | 0 | 2 |
| Vincent O'Higgin | 2028-2028 | 2 | 7 | .222 | 4.18 | 14 | 14 | 2 | 0 | 0 | 84.0 | 87 | 39 | 6 | 22 | 85 |
| Goodluck Obasanjo | 2029-2029 | 3 | 4 | .429 | 2.84 | 13 | 13 | 2 | 1 | 0 | 95.0 | 77 | 30 | 6 | 21 | 106 |
| Taro Ohayashi | 2020-2020 | 7 | 5 | .583 | 2.55 | 30 | 11 | 1 | 0 | 0 | 102.1 | 74 | 29 | 4 | 34 | 79 |
| Luis Oliva | 2020-2020 | 0 | 0 | .000 | 3.38 | 5 | 0 | 0 | 0 | 0 | 2.2 | 3 | 1 | 0 | 2 | 1 |
| Ramón Oliveira | 2020-2021 | 2 | 6 | .250 | 7.28 | 13 | 8 | 0 | 0 | 0 | 59.1 | 90 | 48 | 1 | 15 | 37 |
| Robert Olson | 2021-2021 | 0 | 0 | .000 | 4.19 | 6 | 0 | 0 | 0 | 0 | 19.1 | 24 | 9 | 0 | 4 | 13 |
| Emil Olsson | 2025-2026 | 8 | 6 | .571 | 3.65 | 19 | 19 | 1 | 0 | 0 | 106.0 | 95 | 43 | 5 | 39 | 105 |
| Milan Opalka | 2028-2028 | 0 | 0 | .000 | 0.00 | 2 | 0 | 0 | 0 | 0 | 2.0 | 1 | 0 | 0 | 0 | 5 |
| Juan Ordóńez | 2023-2023 | 6 | 2 | .750 | 4.07 | 14 | 6 | 0 | 0 | 1 | 48.2 | 55 | 22 | 0 | 20 | 25 |
| Germán Orozco | 2020-2020 | 3 | 2 | .600 | 2.37 | 23 | 0 | 0 | 0 | 5 | 38.0 | 32 | 10 | 1 | 22 | 31 |
| Cisco Ortega | 2021-2026 | 3 | 2 | .600 | 2.26 | 29 | 2 | 1 | 0 | 2 | 51.2 | 38 | 13 | 0 | 22 | 51 |
| Alberto Ortíz | 2029-2029 | 4 | 10 | .286 | 4.63 | 19 | 19 | 0 | 0 | 0 | 103.0 | 124 | 53 | 10 | 27 | 99 |
| Armando Ortíz | 2021-2025 | 43 | 20 | .683 | 2.71 | 86 | 71 | 7 | 0 | 0 | 547.2 | 441 | 165 | 22 | 148 | 564 |
| Carlos Ortíz | 2027-2028 | 4 | 2 | .667 | 3.22 | 20 | 0 | 0 | 0 | 1 | 50.1 | 46 | 18 | 3 | 20 | 43 |
| Cisco Ortíz | 2023-2023 | 7 | 7 | .500 | 3.40 | 20 | 19 | 2 | 0 | 0 | 132.1 | 127 | 50 | 5 | 45 | 131 |
| Pancho Ortíz | 2025-2025 | 2 | 1 | .667 | 1.38 | 22 | 0 | 0 | 0 | 10 | 32.2 | 27 | 5 | 0 | 14 | 38 |
| Pedro Ortíz | 2029-2029 | 3 | 5 | .375 | 2.77 | 33 | 4 | 0 | 0 | 3 | 78.0 | 74 | 24 | 3 | 35 | 83 |
| Reynaldo Ortíz | 2020-2020 | 0 | 0 | .000 | 1.12 | 1 | 1 | 0 | 0 | 0 | 8.0 | 4 | 1 | 0 | 3 | 9 |
| Richard Osborn | 2025-2027 | 3 | 9 | .250 | 2.17 | 103 | 0 | 0 | 0 | 45 | 107.2 | 67 | 26 | 4 | 42 | 134 |
| Odemar Ouweneel | 2021-2021 | 3 | 1 | .750 | 0.57 | 37 | 0 | 0 | 0 | 11 | 31.2 | 14 | 2 | 1 | 8 | 39 |
| Rich Overby | 2027-2029 | 7 | 7 | .500 | 2.97 | 45 | 6 | 0 | 0 | 4 | 118.1 | 91 | 39 | 5 | 55 | 143 |
