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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 |
|---|---|---|---|---|---|---|---|---|---|
| Ross O'Brien | 2037-2040 | .225 | 42 | 165 | 0 | 0 | 0 | 0.00 | 0 |
| Jaden O'Hara | 2031-2037 | .000 | 0 | 0 | 7 | 12 | 2 | 5.86 | 142 |
| Lee O'Meara | 2039-2042 | .000 | 0 | 0 | 28 | 36 | 0 | 3.34 | 466 |
| Antonio Ocana | 2034-2039 | .198 | 16 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Ochoa | 2041-2042 | .000 | 0 | 0 | 6 | 7 | 0 | 2.40 | 97 |
| Joe Odom | 2024-2037 | .000 | 0 | 0 | 51 | 66 | 7 | 4.51 | 911 |
| Adam Ogden | 2024-2033 | .000 | 0 | 0 | 16 | 10 | 10 | 4.66 | 268 |
| Izzy Ojeda | 2026-2028 | .000 | 0 | 0 | 2 | 1 | 0 | 5.53 | 81 |
| Juan Olea | 2024-2027 | .000 | 0 | 0 | 3 | 3 | 1 | 6.89 | 178 |
| Antonio Olivares | 2024-2035 | .000 | 0 | 0 | 41 | 39 | 137 | 2.96 | 520 |
| Marco Olivares | 2025-2038 | .253 | 161 | 560 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Olivas | 2024-2042 | .297 | 431 | 1199 | 0 | 0 | 0 | 0.00 | 0 |
| Nick Oliver | 2042-2042 | .323 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Sebastian Oliver | 2031-2039 | .000 | 0 | 0 | 57 | 47 | 0 | 4.03 | 780 |
| Chris Olmedo | 2041-2042 | .193 | 4 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Greg Olsen | 2027-2042 | .000 | 0 | 0 | 165 | 62 | 0 | 3.00 | 2031 |
| Tim Olson | 2035-2037 | .000 | 0 | 0 | 14 | 12 | 0 | 4.07 | 206 |
| John Oltman | 2039-2039 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Marvin Orellana | 2035-2035 | .000 | 0 | 0 | 1 | 1 | 0 | 5.65 | 16 |
| John Organ | 2024-2025 | .144 | 3 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Jon Organes | 2032-2039 | .000 | 0 | 0 | 10 | 10 | 4 | 4.29 | 282 |
| Ruben Ornelas | 2042-2042 | .000 | 0 | 0 | 0 | 0 | 0 | 4.50 | 21 |
| Emilio Orona | 2035-2042 | .219 | 30 | 108 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Oropeza | 2027-2027 | .000 | 0 | 0 | 0 | 9 | 0 | 10.12 | 34 |
| Carlos Orozco | 2042-2042 | .000 | 0 | 0 | 3 | 6 | 0 | 3.97 | 76 |
| Angel Ortega | 2037-2042 | .000 | 0 | 0 | 24 | 32 | 0 | 3.14 | 494 |
| Jose Ortega | 2024-2029 | .238 | 78 | 227 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ortega | 2024-2032 | .200 | 81 | 279 | 0 | 0 | 0 | 0.00 | 0 |
| Ramon Ortega | 2030-2042 | .190 | 74 | 267 | 0 | 0 | 0 | 0.00 | 0 |
| Angelo Ortiz | 2038-2040 | .201 | 7 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Danny Ortiz | 2040-2042 | .000 | 0 | 0 | 7 | 5 | 4 | 2.32 | 128 |
| Jose Ortiz | 2027-2035 | .188 | 44 | 161 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Ortiz | 2030-2041 | .000 | 0 | 0 | 23 | 15 | 8 | 3.14 | 311 |
| Rodrigo Ortiz | 2041-2042 | .263 | 18 | 61 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Ortolaza | 2032-2042 | .000 | 0 | 0 | 29 | 40 | 69 | 4.17 | 387 |
| George Osborn | 2024-2031 | .263 | 29 | 204 | 0 | 0 | 0 | 0.00 | 0 |
| Tom Osborn | 2027-2029 | .000 | 0 | 0 | 2 | 2 | 0 | 5.55 | 109 |
| Sam Osbun | 2039-2042 | .000 | 0 | 0 | 1 | 4 | 1 | 3.94 | 135 |
| Brady Ostdiek | 2028-2040 | .229 | 72 | 295 | 0 | 0 | 0 | 0.00 | 0 |
| Joel Owens | 2034-2042 | .257 | 58 | 167 | 0 | 0 | 0 | 0.00 | 0 |
