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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 |
|---|---|---|---|---|---|---|---|---|---|
| Mike O'Brien | 2058-2063 | .000 | 0 | 0 | 11 | 5 | 35 | 2.73 | 154 |
| Carl O'Dwyer | 2045-2059 | .000 | 0 | 0 | 28 | 30 | 28 | 3.68 | 647 |
| Joe O'Keefe | 2059-2063 | .000 | 0 | 0 | 2 | 0 | 0 | 3.76 | 49 |
| Corey O'Malley | 2061-2061 | .171 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Danny O'Malley | 2043-2044 | .000 | 0 | 0 | 2 | 1 | 3 | 4.16 | 66 |
| Doug O'Toole | 2062-2063 | .314 | 2 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Jason Oberg | 2022-2026 | .221 | 12 | 117 | 0 | 0 | 0 | 0.00 | 0 |
| Eric Oberlander | 2049-2055 | .287 | 15 | 82 | 0 | 0 | 0 | 0.00 | 0 |
| Ray Ocasio | 2024-2034 | .265 | 108 | 331 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Oceguera | 2032-2038 | .271 | 5 | 146 | 0 | 0 | 0 | 0.00 | 0 |
| Mauricio Ochoa | 2063-2063 | .278 | 6 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Oscar Ochoa | 2038-2040 | .000 | 0 | 0 | 8 | 9 | 4 | 4.21 | 108 |
| Tony Ochoa | 2054-2059 | .000 | 0 | 0 | 3 | 11 | 1 | 5.62 | 164 |
| Pat Odom | 2060-2063 | .000 | 0 | 0 | 12 | 6 | 13 | 1.83 | 205 |
| Raul Ojeda | 2032-2034 | .240 | 4 | 52 | 0 | 0 | 0 | 0.00 | 0 |
| Jason Olberding | 2061-2063 | .269 | 33 | 125 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Olinde | 2034-2035 | .200 | 4 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Ryan Oliver | 2050-2058 | .000 | 0 | 0 | 16 | 11 | 29 | 3.69 | 199 |
| Danny Oliveras | 2050-2056 | .211 | 14 | 144 | 0 | 0 | 0 | 0.00 | 0 |
| Ramon Olmos | 2045-2045 | .333 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Tim Olson | 2022-2031 | .000 | 0 | 0 | 21 | 27 | 8 | 4.97 | 262 |
| Omar Olvera | 2054-2059 | .223 | 6 | 35 | 0 | 0 | 0 | 13.50 | 1 |
| Willie Oquendo | 2034-2034 | .214 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Hector Orduno | 2059-2062 | .000 | 0 | 0 | 6 | 3 | 3 | 3.87 | 99 |
| Ralph Ore | 2027-2040 | .288 | 114 | 522 | 0 | 0 | 0 | 0.00 | 0 |
| Victor Orellana | 2054-2063 | .218 | 17 | 186 | 0 | 0 | 0 | 0.00 | 0 |
| Bobby Ornelas | 2022-2032 | .000 | 0 | 0 | 13 | 15 | 9 | 3.84 | 198 |
| Jose Orosco | 2037-2038 | .000 | 0 | 0 | 0 | 0 | 0 | 5.81 | 25 |
| Mario Orozco | 2054-2062 | .000 | 0 | 0 | 4 | 0 | 1 | 3.31 | 82 |
| Carlos Orta | 2059-2063 | .240 | 5 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Alvaro Ortega | 2029-2044 | .000 | 0 | 0 | 23 | 20 | 12 | 4.39 | 476 |
| Javy Ortega | 2057-2059 | .268 | 1 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Alberto Ortiz | 2047-2050 | .000 | 0 | 0 | 5 | 11 | 1 | 6.01 | 112 |
| Alex Ortiz | 2055-2060 | .264 | 6 | 63 | 0 | 0 | 0 | 0.00 | 0 |
| Alex Ortiz | 2024-2024 | .227 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Alex Ortiz | 2052-2053 | .266 | 2 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Angel Ortiz | 2036-2048 | .000 | 0 | 0 | 14 | 12 | 1 | 4.36 | 182 |
| Danny Ortiz | 2036-2048 | .000 | 0 | 0 | 90 | 77 | 0 | 3.93 | 1169 |
| Jordan Ortiz | 2044-2049 | .000 | 0 | 0 | 16 | 9 | 6 | 4.39 | 165 |
| Jorge Ortiz | 2022-2040 | .000 | 0 | 0 | 32 | 42 | 98 | 3.34 | 381 |
| Jose Ortiz | 2022-2024 | .271 | 25 | 145 | 0 | 0 | 0 | 0.00 | 0 |
| Vinny Ortiz | 2022-2041 | .266 | 54 | 455 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Ortiz Jr. | 2036-2042 | .000 | 0 | 0 | 13 | 22 | 0 | 5.52 | 136 |
| Roberto Osorio | 2046-2051 | .277 | 24 | 165 | 0 | 0 | 0 | 0.00 | 0 |
| Ross Otalora | 2024-2036 | .221 | 39 | 177 | 0 | 0 | 0 | 0.00 | 0 |
| Sean Otto | 2047-2052 | .000 | 0 | 0 | 4 | 4 | 1 | 3.70 | 62 |
| Sam Ouellette | 2022-2030 | .000 | 0 | 0 | 4 | 3 | 0 | 6.10 | 97 |
| David Owen | 2022-2027 | .000 | 0 | 0 | 20 | 16 | 1 | 4.79 | 181 |
| John Owen | 2022-2027 | .000 | 0 | 0 | 2 | 0 | 1 | 4.23 | 164 |
| Mickey Owen | 2060-2060 | .000 | 0 | 0 | 1 | 0 | 0 | 3.53 | 35 |
| Mike Owen | 2055-2063 | .315 | 2 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Austin Owens | 2048-2054 | .000 | 0 | 0 | 20 | 20 | 3 | 3.88 | 249 |
| Jared Owens | 2045-2050 | .211 | 3 | 90 | 0 | 0 | 0 | 0.00 | 0 |
| Jeff Owens | 2058-2060 | .253 | 9 | 56 | 0 | 0 | 0 | 0.00 | 0 |
