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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 |
|---|---|---|---|---|---|---|---|---|---|
| Jim O'Brien | 2018-2020 | .000 | 0 | 0 | 33 | 15 | 0 | 2.29 | 476 |
| John O'Brien | 2051-2052 | .242 | 29 | 79 | 0 | 0 | 0 | 0.00 | 0 |
| Jerry O'Bryan | 2047-2049 | .000 | 0 | 0 | 18 | 8 | 0 | 3.10 | 292 |
| Hal O'Conelly | 2046-2048 | .300 | 18 | 85 | 0 | 0 | 0 | 0.00 | 0 |
| Bob O'Reilly | 2061-2063 | .229 | 34 | 112 | 0 | 0 | 0 | 0.00 | 0 |
| Jeff O'Rourke | 2066-2068 | .217 | 16 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Alec O'Slattery | 2017-2019 | .262 | 42 | 145 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Oakley | 2067-2068 | .248 | 3 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Jared Oberdick | 2055-2056 | .297 | 1 | 5 | 3 | 3 | 0 | 4.30 | 65 |
| Oscar Ochoa | 2055-2057 | .259 | 8 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Jonathan Ogden | 2066-2068 | .290 | 11 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Tsugiharu Ohayashi | 2019-2020 | .000 | 0 | 0 | 10 | 15 | 0 | 3.53 | 262 |
| Kazuya Okumura | 2058-2059 | .000 | 0 | 0 | 3 | 4 | 2 | 3.79 | 94 |
| Juan Olivas | 2055-2057 | .228 | 60 | 136 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Oliver | 2054-2055 | .000 | 0 | 0 | 3 | 4 | 3 | 1.90 | 91 |
| Luis Olivo | 2065-2068 | .000 | 0 | 0 | 7 | 12 | 0 | 4.90 | 180 |
| Sean Ollier | 2037-2038 | .240 | 23 | 88 | 0 | 0 | 0 | 0.00 | 0 |
| Greg Olson | 2019-2020 | .249 | 7 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Keith Olson | 2053-2054 | .000 | 0 | 0 | 11 | 6 | 0 | 3.00 | 188 |
| Dave Olvera | 2023-2024 | .297 | 31 | 117 | 0 | 0 | 0 | 0.00 | 0 |
| Frank Olvera | 2063-2063 | .273 | 2 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Everett Onstott | 2060-2063 | .000 | 0 | 0 | 10 | 3 | 0 | 2.96 | 215 |
| Juan Ontiberos | 2055-2057 | .229 | 15 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Maup Oosterman | 2023-2024 | .000 | 0 | 0 | 7 | 7 | 47 | 1.94 | 104 |
| Erjan Oprel | 2039-2042 | .255 | 60 | 150 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Opstad | 2031-2033 | .000 | 0 | 0 | 9 | 7 | 2 | 4.05 | 147 |
| Jose Ordonez | 2063-2066 | .263 | 24 | 102 | 0 | 0 | 0 | 0.00 | 0 |
| Edwin Orduno | 2056-2059 | .000 | 0 | 0 | 4 | 4 | 1 | 3.13 | 110 |
| Chris Oren | 2057-2060 | .230 | 11 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Luke Orendorff | 2058-2061 | .208 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Justin Orr | 2064-2067 | .253 | 11 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Ortega | 2061-2064 | .240 | 9 | 73 | 0 | 0 | 0 | 0.00 | 0 |
| Jake Ortega | 2045-2046 | .000 | 0 | 0 | 8 | 2 | 31 | 3.44 | 88 |
| Armando Ortiz | 2064-2067 | .259 | 7 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Daniel Ortiz | 2059-2062 | .274 | 47 | 161 | 0 | 0 | 0 | 0.00 | 0 |
| Fernando Ortiz | 2057-2059 | .274 | 29 | 78 | 0 | 0 | 0 | 0.00 | 0 |
| Gus Ortiz | 2063-2066 | .214 | 19 | 91 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ortiz | 2067-2068 | .000 | 0 | 0 | 1 | 1 | 1 | 7.43 | 29 |
| Omar Ortiz | 2052-2053 | .285 | 36 | 81 | 0 | 0 | 0 | 0.00 | 0 |
| Thurman Orton | 2063-2066 | .000 | 0 | 0 | 6 | 6 | 47 | 2.29 | 102 |
| Alfredo Ortíz | 2031-2032 | .269 | 11 | 61 | 0 | 0 | 0 | 0.00 | 0 |
| António Ortíz | 2021-2022 | .256 | 23 | 79 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Ortíz | 2043-2044 | .285 | 41 | 140 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortíz | 2021-2022 | .000 | 0 | 0 | 12 | 20 | 0 | 4.58 | 203 |
| José Ortíz | 2017-2017 | .277 | 25 | 74 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortíz | 2020-2021 | .263 | 4 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Raúl Ortíz | 2050-2051 | .181 | 3 | 9 | 7 | 2 | 0 | 1.94 | 146 |
| Jason Osborn | 2066-2068 | .256 | 11 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Bob Osborne | 2018-2020 | .000 | 0 | 0 | 28 | 6 | 14 | 2.56 | 422 |
| Nate Osborne | 2058-2061 | .000 | 0 | 0 | 8 | 4 | 2 | 2.86 | 285 |
| Danny Osnaya | 2059-2062 | .227 | 10 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Taizo Otsuki | 2023-2024 | .246 | 28 | 70 | 0 | 0 | 0 | 0.00 | 0 |
| Wing-chiu Ouyang | 2017-2020 | .000 | 0 | 0 | 25 | 28 | 0 | 3.31 | 622 |
| Pablo Ovalle | 2060-2062 | .000 | 0 | 0 | 5 | 11 | 24 | 2.96 | 180 |
| Mike Overholtz | 2066-2068 | .294 | 6 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Overly | 2067-2068 | .000 | 0 | 0 | 3 | 3 | 1 | 5.02 | 70 |
| A.J. Overman | 2053-2054 | .000 | 0 | 0 | 5 | 10 | 0 | 3.85 | 200 |
| Jeremy Owen | 2018-2020 | .205 | 6 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Sean Owen | 2067-2068 | .000 | 0 | 0 | 5 | 4 | 1 | 4.95 | 85 |
| Chris Owens | 2056-2059 | .000 | 0 | 0 | 9 | 6 | 4 | 4.14 | 278 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Chris Owens | 2068-2068 | .350 | 1 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Phil Owens | 2032-2033 | .000 | 0 | 0 | 8 | 8 | 23 | 2.48 | 170 |
| Steve Owens | 2036-2037 | .328 | 37 | 122 | 0 | 0 | 0 | 0.00 | 0 |
