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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| William O'Brien | 2043-2043 | 3 | 4 | .429 | 6.00 | 15 | 0 | 0 | 0 | 5 | 15.0 | 20 | 10 | 1 | 10 | 25 |
| Dave O'Cosgrove | 2044-2045 | 4 | 2 | .667 | 3.53 | 20 | 5 | 0 | 0 | 3 | 43.1 | 41 | 17 | 2 | 24 | 43 |
| Alan O'Criodan | 2045-2048 | 7 | 9 | .438 | 5.65 | 37 | 33 | 0 | 0 | 1 | 146.2 | 165 | 92 | 9 | 94 | 158 |
| Steve O'Feeny | 2033-2035 | 12 | 7 | .632 | 3.31 | 37 | 37 | 0 | 0 | 0 | 179.2 | 148 | 66 | 7 | 92 | 223 |
| Brett O'Halloran | 2023-2024 | 8 | 5 | .615 | 5.21 | 17 | 17 | 0 | 0 | 0 | 96.2 | 104 | 56 | 10 | 64 | 86 |
| Doug O'Halloran | 2028-2028 | 0 | 0 | .000 | 0.00 | 6 | 0 | 0 | 0 | 0 | 5.2 | 4 | 0 | 0 | 1 | 6 |
| David O'Heydon | 2031-2034 | 2 | 0 | 1.000 | 1.10 | 4 | 3 | 0 | 0 | 0 | 16.1 | 10 | 2 | 0 | 13 | 10 |
| Scott O'Larissey | 2026-2026 | 8 | 3 | .727 | 4.23 | 41 | 0 | 0 | 0 | 4 | 55.1 | 51 | 26 | 4 | 20 | 53 |
| Elliott O'Rorke | 2046-2049 | 11 | 11 | .500 | 3.08 | 68 | 18 | 0 | 0 | 17 | 149.0 | 124 | 51 | 6 | 81 | 164 |
| Dave O'Toole | 2047-2047 | 0 | 5 | .000 | 9.13 | 7 | 7 | 0 | 0 | 0 | 23.2 | 37 | 24 | 3 | 22 | 16 |
| Hirotada Ohayashi | 2050-2051 | 0 | 0 | .000 | 2.22 | 14 | 0 | 0 | 0 | 0 | 28.1 | 26 | 7 | 1 | 16 | 29 |
| Matsudaira Ohayashi | 2050-2051 | 1 | 2 | .333 | 5.96 | 22 | 0 | 0 | 0 | 0 | 45.1 | 34 | 30 | 7 | 34 | 58 |
| Bryan Olivares | 2048-2051 | 18 | 18 | .500 | 5.29 | 61 | 45 | 0 | 0 | 1 | 267.1 | 292 | 157 | 41 | 105 | 283 |
| Luis Olivares | 2047-2047 | 5 | 6 | .455 | 5.36 | 15 | 15 | 1 | 0 | 0 | 87.1 | 103 | 52 | 19 | 35 | 98 |
| Rob Olivarez | 2030-2030 | 1 | 0 | 1.000 | 9.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 1 | 1 | 0 | 2 | 1 |
| Daniel Oliver | 2048-2051 | 18 | 12 | .600 | 3.41 | 60 | 60 | 0 | 0 | 0 | 282.0 | 254 | 107 | 24 | 126 | 376 |
| Jorge Olvera | 2049-2051 | 1 | 0 | 1.000 | 1.44 | 14 | 0 | 0 | 0 | 0 | 25.0 | 17 | 4 | 2 | 12 | 30 |
| Motonobu Omori | 2051-2051 | 8 | 4 | .667 | 2.47 | 16 | 16 | 0 | 0 | 0 | 83.2 | 55 | 23 | 9 | 40 | 93 |
| Min-gook Ong | 2042-2043 | 9 | 8 | .529 | 2.60 | 42 | 15 | 0 | 0 | 15 | 121.1 | 95 | 35 | 14 | 34 | 159 |
| Javier Ontiveros | 2050-2050 | 5 | 0 | 1.000 | 3.99 | 8 | 8 | 0 | 0 | 0 | 47.1 | 50 | 21 | 6 | 23 | 43 |
| Arturo Ortíz | 2041-2041 | 6 | 3 | .667 | 2.34 | 36 | 0 | 0 | 0 | 9 | 84.2 | 62 | 22 | 7 | 35 | 135 |
| Fernando Ortíz | 2027-2027 | 1 | 2 | .333 | 2.37 | 3 | 3 | 0 | 0 | 0 | 19.0 | 16 | 5 | 1 | 10 | 16 |
| Jorge Ortíz | 2050-2051 | 3 | 0 | 1.000 | 3.52 | 18 | 0 | 0 | 0 | 5 | 30.2 | 16 | 12 | 2 | 23 | 34 |
| Juan Ortíz | 2051-2051 | 1 | 3 | .250 | 2.45 | 16 | 0 | 0 | 0 | 1 | 40.1 | 23 | 11 | 3 | 14 | 47 |
| Júlio Ortíz | 2048-2049 | 8 | 5 | .615 | 4.09 | 40 | 8 | 0 | 0 | 0 | 116.2 | 113 | 53 | 9 | 49 | 153 |
| Mike Owen | 2026-2027 | 7 | 2 | .778 | 3.26 | 16 | 12 | 0 | 0 | 0 | 80.0 | 67 | 29 | 7 | 47 | 71 |
| Henry Owens | 2034-2034 | 1 | 0 | 1.000 | 0.00 | 6 | 0 | 0 | 0 | 4 | 6.0 | 3 | 0 | 0 | 2 | 8 |
