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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 |
| David O'Halloran | 2052-2052 | .000 | 0 | 0 | 2 | 2 | 3 | 3.38 | 33 |
| 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 |
| Visa Ojanen | 2052-2052 | .143 | 0 | 1 | 3 | 6 | 0 | 3.64 | 80 |
| 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 |
| Ieyoshi Okada | 2054-2055 | .125 | 0 | 0 | 5 | 15 | 0 | 4.53 | 172 |
| Paulaui Olakeakua | 2049-2051 | .283 | 13 | 70 | 0 | 0 | 0 | 0.00 | 0 |
| Dean Oldknow | 2053-2053 | .000 | 0 | 0 | 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 |
| Allen Oliver | 2052-2052 | .000 | 0 | 0 | 1 | 2 | 2 | 1.59 | 30 |
| Cole Oliver | 2053-2053 | .328 | 0 | 3 | 6 | 4 | 0 | 4.18 | 92 |
| Christos Olson | 2056-2056 | .224 | 2 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Rusty Oomsen | 2053-2054 | .000 | 0 | 0 | 3 | 5 | 5 | 6.31 | 71 |
| Nelle Oort | 2054-2054 | .000 | 0 | 0 | 4 | 3 | 0 | 2.89 | 72 |
| Maurice Ooyendijk | 2055-2056 | .000 | 0 | 0 | 1 | 0 | 0 | 4.26 | 21 |
| Pedrag Opacic | 2055-2056 | .206 | 5 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Tobias Opsteegh | 2054-2056 | .000 | 0 | 0 | 11 | 5 | 9 | 2.54 | 123 |
| Charles Organ | 2055-2055 | .000 | 0 | 0 | 5 | 2 | 1 | 3.02 | 50 |
| Rizhean Orille | 2054-2055 | .269 | 9 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Felipe Ornelas | 2052-2052 | .292 | 7 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Ornelas | 2055-2056 | .000 | 0 | 0 | 0 | 2 | 0 | 3.42 | 34 |
| Carlos Orozco | 2050-2052 | .167 | 0 | 0 | 9 | 11 | 5 | 3.69 | 113 |
| Juan Orozco | 2052-2052 | .235 | 10 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Luis Orozco | 2055-2056 | .000 | 0 | 0 | 7 | 1 | 9 | 1.64 | 73 |
| Brian Orpen | 2049-2050 | .255 | 11 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Daniel Orr | 2056-2056 | .000 | 0 | 0 | 5 | 6 | 0 | 3.99 | 94 |
| 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 |
| José Ortega | 2052-2052 | .316 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| António Ortíz | 2056-2056 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 15 |
| 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 |
| Tony Ortíz | 2055-2055 | .252 | 5 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Calvin Oskamp | 2056-2056 | .000 | 0 | 0 | 6 | 5 | 1 | 4.32 | 52 |
| Oliver Oskamp | 2055-2056 | .184 | 8 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| José Otero | 2048-2048 | .600 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Siaki Otimi | 2056-2056 | .000 | 0 | 0 | 1 | 0 | 0 | 0.00 | 9 |
| Sen Otsuka | 2051-2051 | .053 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ben Ottinger | 2055-2055 | .243 | 4 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Chi-ju Ou-yang | 2054-2054 | .000 | 0 | 0 | 2 | 6 | 0 | 6.80 | 43 |
| Abraham Overdevest | 2051-2053 | .239 | 3 | 8 | 3 | 1 | 3 | 2.57 | 44 |
| Jim Owen | 2053-2054 | .156 | 15 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Reginald Owens | 2052-2052 | .219 | 5 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Owens | 2054-2054 | .403 | 5 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Masamune Oyama | 2056-2056 | .000 | 0 | 0 | 1 | 1 | 0 | 3.67 | 20 |
| Júlio Oyas | 2056-2056 | .161 | 1 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Maks Ozerin | 2054-2056 | .262 | 19 | 42 | 0 | 0 | 0 | 0.00 | 0 |
