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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Kevin O'Brian | 2048-2049 | 7 | 5 | .583 | 3.32 | 58 | 0 | 0 | 0 | 9 | 100.1 | 93 | 37 | 8 | 58 | 91 |
| Jim O'Brien | 2018-2020 | 33 | 15 | .688 | 2.29 | 66 | 66 | 1 | 0 | 0 | 437.0 | 304 | 111 | 25 | 103 | 476 |
| Jerry O'Bryan | 2047-2049 | 18 | 8 | .692 | 3.10 | 43 | 43 | 0 | 0 | 0 | 215.0 | 171 | 74 | 23 | 66 | 292 |
| Jared Oberdick | 2055-2056 | 3 | 3 | .500 | 4.30 | 19 | 0 | 0 | 0 | 0 | 37.2 | 29 | 18 | 2 | 38 | 65 |
| Tsugiharu Ohayashi | 2019-2020 | 10 | 15 | .400 | 3.53 | 40 | 40 | 0 | 0 | 0 | 229.1 | 183 | 90 | 26 | 111 | 262 |
| Kazuya Okumura | 2058-2059 | 3 | 4 | .429 | 3.79 | 26 | 2 | 0 | 0 | 2 | 59.1 | 53 | 25 | 16 | 30 | 94 |
| Edgar Olivas | 2061-2064 | 7 | 2 | .778 | 2.37 | 74 | 0 | 0 | 0 | 4 | 110.1 | 87 | 29 | 14 | 55 | 183 |
| Mike Oliver | 2054-2055 | 3 | 4 | .429 | 1.90 | 30 | 12 | 0 | 0 | 3 | 85.1 | 55 | 18 | 7 | 30 | 91 |
| Luis Olivo | 2065-2066 | 3 | 1 | .750 | 3.82 | 14 | 14 | 0 | 0 | 0 | 61.1 | 72 | 26 | 8 | 25 | 65 |
| Keith Olson | 2053-2054 | 11 | 6 | .647 | 3.00 | 26 | 26 | 0 | 0 | 0 | 147.0 | 109 | 49 | 17 | 44 | 188 |
| Everett Onstott | 2060-2063 | 10 | 3 | .769 | 2.96 | 63 | 6 | 0 | 0 | 0 | 134.0 | 95 | 44 | 16 | 61 | 215 |
| Maup Oosterman | 2023-2024 | 7 | 7 | .500 | 1.94 | 82 | 0 | 0 | 0 | 47 | 88.0 | 63 | 19 | 4 | 20 | 104 |
| Dave Opstad | 2031-2033 | 9 | 7 | .562 | 4.05 | 67 | 7 | 0 | 0 | 2 | 135.2 | 114 | 61 | 15 | 93 | 147 |
| Edwin Orduno | 2056-2059 | 4 | 4 | .500 | 3.13 | 34 | 0 | 0 | 0 | 1 | 86.1 | 75 | 30 | 8 | 34 | 110 |
| Jake Ortega | 2045-2046 | 8 | 2 | .800 | 3.44 | 60 | 0 | 0 | 0 | 31 | 68.0 | 45 | 26 | 9 | 33 | 88 |
| Thurman Orton | 2063-2066 | 5 | 6 | .455 | 2.39 | 67 | 0 | 0 | 0 | 32 | 75.1 | 64 | 20 | 8 | 30 | 83 |
| José Ortíz | 2021-2022 | 12 | 20 | .375 | 4.58 | 47 | 47 | 0 | 0 | 0 | 257.2 | 281 | 131 | 21 | 109 | 203 |
| Raúl Ortíz | 2050-2051 | 7 | 2 | .778 | 1.94 | 22 | 22 | 0 | 0 | 0 | 111.1 | 68 | 24 | 5 | 51 | 146 |
| Bob Osborne | 2018-2020 | 28 | 6 | .824 | 2.56 | 73 | 51 | 0 | 0 | 14 | 344.0 | 233 | 98 | 22 | 110 | 422 |
| Nate Osborne | 2058-2061 | 8 | 4 | .667 | 2.86 | 68 | 1 | 0 | 0 | 2 | 138.2 | 78 | 44 | 16 | 89 | 285 |
| Wing-chiu Ouyang | 2017-2020 | 25 | 28 | .472 | 3.31 | 84 | 84 | 0 | 0 | 0 | 517.0 | 434 | 190 | 61 | 158 | 622 |
| Pablo Ovalle | 2060-2062 | 5 | 11 | .312 | 2.96 | 56 | 12 | 0 | 0 | 24 | 106.1 | 70 | 35 | 14 | 34 | 180 |
| A.J. Overman | 2053-2054 | 5 | 10 | .333 | 3.85 | 26 | 26 | 0 | 0 | 0 | 128.2 | 94 | 55 | 16 | 51 | 200 |
| Brian Owens | 2065-2066 | 5 | 0 | 1.000 | 5.22 | 16 | 0 | 0 | 0 | 0 | 39.2 | 37 | 23 | 7 | 28 | 56 |
| Chris Owens | 2056-2059 | 9 | 6 | .600 | 4.14 | 70 | 2 | 0 | 0 | 4 | 202.0 | 184 | 93 | 32 | 98 | 278 |
| Phil Owens | 2032-2033 | 8 | 8 | .500 | 2.48 | 64 | 21 | 1 | 1 | 23 | 167.0 | 124 | 46 | 10 | 59 | 170 |
