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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
|---|---|---|---|---|---|---|---|---|---|
| Jung-keun O | 2050-2050 | .000 | 0 | 0 | 1 | 5 | 1 | 7.20 | 44 |
| Ryan O'Callahan | 2049-2049 | .397 | 0 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Paul O'Rorke | 2051-2051 | .167 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Clint O'Toole | 2048-2048 | .347 | 2 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Yoichibei Ogawa | 2048-2049 | .000 | 0 | 0 | 6 | 5 | 0 | 7.91 | 56 |
| Atsushi Ohayashi | 2048-2048 | .000 | 0 | 0 | 0 | 0 | 0 | 5.23 | 13 |
| Armando Ojeda | 2050-2050 | .281 | 14 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Álex Ojeda | 2049-2050 | .290 | 4 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Hoshi Ojima | 2048-2049 | .317 | 1 | 57 | 0 | 0 | 0 | 0.00 | 0 |
| Paulaui Olakeakua | 2049-2051 | .283 | 13 | 70 | 0 | 0 | 0 | 0.00 | 0 |
| Edgardo Olivares | 2051-2051 | .000 | 0 | 0 | 4 | 2 | 4 | 4.85 | 24 |
| César Oliveira | 2048-2048 | .500 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Orozco | 2050-2051 | .000 | 0 | 0 | 3 | 5 | 5 | 4.21 | 44 |
| Brian Orpen | 2049-2050 | .255 | 11 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Lou Orr | 2050-2050 | .232 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Orrala | 2050-2050 | .286 | 0 | 1 | 0 | 0 | 0 | 2.25 | 2 |
| Javier Ortega | 2049-2049 | .250 | 2 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Daniel Ortíz | 2050-2050 | .158 | 2 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| David Ortíz | 2050-2050 | .000 | 0 | 0 | 2 | 2 | 4 | 6.68 | 31 |
| Paco Ortíz | 2048-2048 | .000 | 0 | 0 | 1 | 0 | 1 | 2.95 | 15 |
| Ricardo Ortíz | 2050-2051 | .000 | 0 | 0 | 10 | 4 | 0 | 2.76 | 187 |
| José Otero | 2048-2048 | .600 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Sen Otsuka | 2051-2051 | .053 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Abraham Overdevest | 2051-2051 | .000 | 0 | 0 | 2 | 1 | 0 | 1.06 | 18 |
