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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Bailey O'Donnell | 2040-2042 | 19 | 10 | .655 | 2.35 | 67 | 29 | 0 | 0 | 2 | 230.0 | 192 | 60 | 11 | 61 | 291 |
| Harvey O'Keefe | 2042-2042 | 2 | 1 | .667 | 4.15 | 30 | 0 | 0 | 0 | 10 | 52.0 | 45 | 24 | 4 | 30 | 48 |
| Daniel O'Toole | 2038-2041 | 8 | 24 | .250 | 3.85 | 66 | 66 | 0 | 0 | 0 | 289.2 | 286 | 124 | 14 | 88 | 298 |
| Josuke Okumura | 2039-2039 | 13 | 3 | .812 | 2.80 | 22 | 22 | 0 | 0 | 0 | 147.2 | 136 | 46 | 8 | 35 | 190 |
| Noah Olinger | 2042-2042 | 5 | 4 | .556 | 2.30 | 11 | 11 | 0 | 0 | 0 | 74.1 | 55 | 19 | 4 | 21 | 56 |
| Jaake Ooyendijk | 2038-2038 | 1 | 0 | 1.000 | 3.63 | 6 | 0 | 0 | 0 | 0 | 17.1 | 14 | 7 | 2 | 3 | 25 |
| Louis Orioli | 2039-2040 | 1 | 1 | .500 | 3.54 | 40 | 0 | 0 | 0 | 2 | 76.1 | 85 | 30 | 6 | 22 | 65 |
| Claudio Ortega | 2040-2040 | 2 | 1 | .667 | 3.44 | 12 | 5 | 0 | 0 | 1 | 34.0 | 28 | 13 | 1 | 5 | 47 |
| Álex Ortíz | 2035-2036 | 12 | 8 | .600 | 2.65 | 36 | 16 | 0 | 0 | 1 | 139.0 | 117 | 41 | 4 | 46 | 155 |
| Félix Ortíz | 2042-2042 | 0 | 0 | .000 | 0.00 | 6 | 0 | 0 | 0 | 0 | 6.2 | 4 | 0 | 0 | 2 | 11 |
| Jorge Ortíz | 2032-2033 | 1 | 1 | .500 | 1.08 | 9 | 0 | 0 | 0 | 0 | 16.2 | 13 | 2 | 0 | 4 | 16 |
| Royce Ortíz | 2032-2032 | 2 | 1 | .667 | 4.02 | 13 | 1 | 0 | 0 | 0 | 40.1 | 47 | 18 | 4 | 14 | 28 |
| Orinosuke Oshiro | 2041-2041 | 3 | 2 | .600 | 3.27 | 6 | 6 | 0 | 0 | 0 | 44.0 | 39 | 16 | 2 | 9 | 39 |
| Tsugahara Ota | 2034-2036 | 6 | 7 | .462 | 5.00 | 57 | 0 | 0 | 0 | 1 | 90.0 | 105 | 50 | 7 | 30 | 97 |
| Aldo Ottens | 2033-2035 | 7 | 10 | .412 | 4.56 | 32 | 28 | 0 | 0 | 1 | 161.2 | 184 | 82 | 9 | 55 | 137 |
| Khadija Oumar | 2036-2038 | 7 | 5 | .583 | 2.95 | 65 | 0 | 0 | 0 | 6 | 113.0 | 89 | 37 | 6 | 29 | 151 |
| Reggie Ouwens | 2032-2034 | 8 | 5 | .615 | 3.53 | 65 | 2 | 1 | 0 | 4 | 165.2 | 191 | 65 | 11 | 55 | 130 |
| Henk Oversluizen | 2042-2042 | 0 | 0 | .000 | 5.23 | 9 | 0 | 0 | 0 | 2 | 10.1 | 12 | 6 | 1 | 6 | 13 |
| Nolan Owens | 2038-2039 | 4 | 2 | .667 | 4.42 | 19 | 8 | 0 | 0 | 2 | 57.0 | 67 | 28 | 2 | 11 | 63 |
| Tex Owens | 2039-2041 | 4 | 7 | .364 | 3.54 | 38 | 0 | 0 | 0 | 8 | 40.2 | 47 | 16 | 2 | 17 | 23 |
