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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jack W O'Connor | 1978-1979 | 11 | 6 | .647 | 3.25 | 39 | 17 | 9 | 2 | 3 | 171.2 | 143 | 62 | 16 | 54 | 134 |
| Denny O'Toole | 1968-1974 | 9 | 9 | .500 | 3.20 | 29 | 20 | 10 | 5 | 0 | 166.0 | 141 | 59 | 8 | 63 | 125 |
| Francisco Obregon | 1957-1957 | 0 | 0 | .000 | 5.63 | 3 | 0 | 0 | 0 | 1 | 8.0 | 10 | 5 | 2 | 2 | 5 |
| Bob Ojeda | 1979-1979 | 12 | 7 | .632 | 3.75 | 26 | 23 | 0 | 0 | 2 | 153.2 | 135 | 64 | 15 | 59 | 89 |
| Len Okrie | 1942-1942 | 0 | 1 | .000 | 4.20 | 1 | 1 | 0 | 0 | 0 | 15.0 | 16 | 7 | 2 | 6 | 9 |
| Mike Olivo | 1964-1964 | 2 | 5 | .286 | 4.17 | 11 | 5 | 1 | 0 | 1 | 41.0 | 48 | 19 | 5 | 21 | 44 |
| Jim Ollom | 1964-1964 | 9 | 12 | .429 | 4.28 | 28 | 26 | 7 | 3 | 0 | 164.0 | 157 | 78 | 11 | 73 | 131 |
| Boyce Orosco | 1981-1981 | 0 | 0 | .000 | 3.60 | 4 | 0 | 0 | 0 | 0 | 10.0 | 9 | 4 | 0 | 4 | 3 |
| Jordan Ortiz | 1980-1980 | 3 | 0 | 1.000 | 4.50 | 15 | 0 | 0 | 0 | 4 | 22.0 | 23 | 11 | 1 | 7 | 14 |
| Leonardo Ortiz | 1979-1981 | 7 | 5 | .583 | 6.20 | 108 | 4 | 0 | 0 | 0 | 183.0 | 233 | 126 | 22 | 123 | 84 |
| Raul Ortiz | 1981-1981 | 6 | 5 | .545 | 3.91 | 14 | 14 | 8 | 1 | 0 | 101.1 | 88 | 44 | 9 | 28 | 102 |
