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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 |
|---|---|---|---|---|---|---|---|---|---|
| Ray O'Day | 2052-2052 | .295 | 3 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| David O'Farrell | 2053-2053 | .000 | 0 | 0 | 2 | 1 | 9 | 1.80 | 21 |
| Nathan O'Rorke | 2053-2053 | .256 | 3 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Arabello Ocampo | 2048-2048 | .395 | 1 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Pavel Ofitserov | 2048-2048 | .000 | 0 | 0 | 1 | 4 | 5 | 7.50 | 13 |
| Seitaro Ogawa | 2048-2048 | .408 | 1 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Spencer Ogle | 2055-2055 | .253 | 6 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Ron Oglethorpe | 2049-2050 | .314 | 6 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Kamuela Okilani | 2055-2055 | 1.000 | 1 | 2 | 1 | 0 | 0 | 0.89 | 19 |
| Dean Oldknow | 2051-2051 | .000 | 0 | 0 | 2 | 3 | 1 | 2.60 | 28 |
| Octávio Olivaies | 2049-2049 | .000 | 0 | 0 | 4 | 6 | 0 | 9.56 | 22 |
| Luis Oliveira | 2052-2054 | .264 | 12 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Larry Oliver | 2052-2052 | .000 | 0 | 0 | 1 | 1 | 0 | 3.29 | 16 |
| Bartolo Olivo | 2053-2055 | .215 | 17 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Nils Oostermeer | 2048-2048 | .000 | 0 | 0 | 0 | 0 | 0 | 3.18 | 19 |
| John Oram | 2052-2054 | .000 | 0 | 0 | 3 | 2 | 3 | 4.58 | 73 |
| Keneki Orana | 2049-2049 | .000 | 0 | 0 | 0 | 0 | 1 | 2.05 | 9 |
| Mike Orchard | 2049-2049 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Rizhean Orille | 2053-2053 | .229 | 6 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Felipe Ornelas | 2050-2050 | .220 | 6 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Ornelas | 2055-2055 | .000 | 0 | 0 | 0 | 0 | 0 | 5.40 | 3 |
| Mario Ornelas | 2054-2054 | .237 | 3 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Michael Orr | 2048-2048 | .387 | 1 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Nicholas Orr | 2051-2051 | .000 | 0 | 0 | 3 | 5 | 5 | 3.20 | 32 |
| Esteban Ortega | 2050-2051 | .221 | 8 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Fernando Ortega | 2055-2055 | .000 | 0 | 0 | 1 | 4 | 2 | 3.00 | 25 |
| José Ortega | 2049-2050 | .273 | 4 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Oliver Ortega | 2048-2048 | .357 | 0 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Ricardo Ortega | 2048-2048 | .474 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Cris Ortíz | 2055-2055 | .273 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Marcos Ortíz | 2050-2051 | .209 | 12 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Vicente Ortíz | 2048-2048 | .000 | 0 | 0 | 2 | 0 | 1 | 5.57 | 9 |
| Wilson Ortíz | 2053-2053 | .287 | 6 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Kunisada Osawa | 2052-2053 | .000 | 0 | 0 | 1 | 2 | 5 | 2.53 | 28 |
| Lorenzo Osorio | 2048-2048 | .391 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Kuniyuki Ota | 2050-2051 | .000 | 0 | 0 | 9 | 4 | 3 | 4.53 | 129 |
| Esteban Otero | 2055-2055 | .000 | 0 | 0 | 0 | 1 | 0 | 10.12 | 7 |
| Sen Otsuka | 2052-2052 | .133 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Kien Ou-yang | 2053-2054 | .000 | 0 | 0 | 6 | 4 | 2 | 2.90 | 78 |
| Ching-wei Ouyang | 2052-2053 | .000 | 0 | 0 | 0 | 2 | 1 | 4.18 | 25 |
| Brant Owens | 2052-2053 | .000 | 0 | 0 | 4 | 7 | 0 | 4.35 | 95 |
| Francis Owens | 2054-2054 | .000 | 0 | 0 | 1 | 2 | 0 | 3.38 | 31 |
| Craig Oyler | 2052-2052 | .000 | 0 | 0 | 0 | 0 | 1 | 2.97 | 35 |
