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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jung-keun O | 2050-2050 | 1 | 5 | .167 | 7.20 | 17 | 5 | 0 | 0 | 1 | 40.0 | 50 | 32 | 9 | 19 | 44 |
| David O'Halloran | 2052-2052 | 2 | 2 | .500 | 3.38 | 9 | 4 | 0 | 0 | 3 | 29.1 | 28 | 11 | 6 | 14 | 33 |
| Yoichibei Ogawa | 2048-2049 | 6 | 5 | .545 | 7.91 | 32 | 7 | 0 | 0 | 0 | 79.2 | 137 | 70 | 4 | 37 | 56 |
| Atsushi Ohayashi | 2048-2048 | 0 | 0 | .000 | 5.23 | 6 | 0 | 0 | 0 | 0 | 10.1 | 13 | 6 | 1 | 3 | 13 |
| Visa Ojanen | 2052-2052 | 3 | 6 | .333 | 3.64 | 11 | 9 | 1 | 1 | 0 | 66.2 | 59 | 27 | 7 | 19 | 80 |
| Dean Oldknow | 2053-2053 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.2 | 1 | 0 | 0 | 0 | 0 |
| Edgardo Olivares | 2051-2051 | 4 | 2 | .667 | 4.85 | 22 | 0 | 0 | 0 | 4 | 29.2 | 29 | 16 | 5 | 13 | 24 |
| Allen Oliver | 2052-2052 | 1 | 2 | .333 | 1.59 | 12 | 1 | 0 | 0 | 2 | 22.2 | 18 | 4 | 2 | 8 | 30 |
| Cole Oliver | 2053-2053 | 6 | 4 | .600 | 4.18 | 13 | 13 | 1 | 0 | 0 | 84.0 | 89 | 39 | 10 | 25 | 92 |
| Rusty Oomsen | 2053-2053 | 2 | 2 | .500 | 5.57 | 18 | 1 | 0 | 0 | 2 | 32.1 | 37 | 20 | 5 | 14 | 39 |
| Nelle Oort | 2054-2054 | 0 | 1 | .000 | 5.14 | 1 | 1 | 0 | 0 | 0 | 7.0 | 10 | 4 | 2 | 1 | 4 |
| Tobias Opsteegh | 2054-2054 | 1 | 0 | 1.000 | 3.00 | 1 | 1 | 0 | 0 | 0 | 6.0 | 5 | 2 | 1 | 1 | 8 |
| Carlos Orozco | 2050-2052 | 9 | 11 | .450 | 3.69 | 46 | 12 | 3 | 0 | 5 | 126.2 | 118 | 52 | 11 | 44 | 113 |
| Miguel Orrala | 2050-2050 | 0 | 0 | .000 | 2.25 | 4 | 0 | 0 | 0 | 0 | 4.0 | 1 | 1 | 1 | 0 | 2 |
| David Ortíz | 2050-2050 | 2 | 2 | .500 | 6.68 | 19 | 3 | 0 | 0 | 4 | 33.2 | 45 | 25 | 6 | 13 | 31 |
| Paco Ortíz | 2048-2048 | 1 | 0 | 1.000 | 2.95 | 7 | 1 | 0 | 0 | 1 | 18.1 | 20 | 6 | 0 | 7 | 15 |
| Ricardo Ortíz | 2050-2051 | 10 | 4 | .714 | 2.76 | 26 | 25 | 0 | 0 | 0 | 160.0 | 126 | 49 | 18 | 52 | 187 |
| Abraham Overdevest | 2051-2053 | 3 | 1 | .750 | 2.57 | 23 | 0 | 0 | 0 | 3 | 42.0 | 41 | 12 | 4 | 16 | 44 |
