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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Steven O'Brien | 1971-1971 | 11 | 2 | .846 | 2.21 | 15 | 15 | 8 | 2 | 0 | 122.1 | 91 | 30 | 7 | 33 | 91 |
| Jack W O'Connor | 1978-1978 | 0 | 1 | .000 | 3.38 | 1 | 1 | 1 | 0 | 0 | 8.0 | 10 | 3 | 0 | 2 | 8 |
| Thomas O'Donnell | 1972-1976 | 2 | 1 | .667 | 6.92 | 10 | 5 | 0 | 0 | 0 | 40.1 | 47 | 31 | 9 | 23 | 26 |
| Timothy O'Neill | 1977-1977 | 1 | 1 | .500 | 1.42 | 7 | 0 | 0 | 0 | 2 | 6.1 | 4 | 1 | 1 | 2 | 6 |
| Denny O'Toole | 1967-1967 | 2 | 1 | .667 | 3.46 | 10 | 3 | 0 | 0 | 1 | 26.0 | 18 | 10 | 1 | 22 | 19 |
| Jim Officer | 1970-1970 | 0 | 0 | .000 | 4.50 | 1 | 1 | 0 | 0 | 0 | 8.0 | 7 | 4 | 1 | 2 | 12 |
| Ron Oglesby | 1968-1968 | 8 | 3 | .727 | 2.66 | 13 | 12 | 2 | 0 | 0 | 71.0 | 58 | 21 | 1 | 24 | 59 |
| Donald Oliver | 1980-1981 | 1 | 1 | .500 | 2.55 | 15 | 0 | 0 | 0 | 0 | 17.2 | 11 | 5 | 3 | 6 | 17 |
| Steven Oliver | 1977-1981 | 2 | 4 | .333 | 4.71 | 24 | 0 | 0 | 0 | 5 | 36.1 | 31 | 19 | 6 | 24 | 25 |
| Al Olmsted | 1975-1978 | 22 | 19 | .537 | 3.70 | 53 | 46 | 15 | 2 | 0 | 338.1 | 293 | 139 | 30 | 138 | 222 |
| Rich Olsen | 1978-1981 | 0 | 0 | .000 | 1.84 | 7 | 0 | 0 | 0 | 0 | 14.2 | 5 | 3 | 2 | 8 | 15 |
| Ed Olwine | 1979-1981 | 5 | 9 | .357 | 6.75 | 41 | 0 | 0 | 0 | 7 | 46.2 | 44 | 35 | 11 | 32 | 50 |
| Robert Omo | 1977-1977 | 6 | 4 | .600 | 2.95 | 13 | 13 | 4 | 1 | 0 | 97.2 | 68 | 32 | 3 | 31 | 94 |
| Sal Orellana | 1976-1978 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 1 | 0 | 0 | 0 | 0 |
| Boyce Orosco | 1980-1981 | 5 | 6 | .455 | 3.97 | 31 | 8 | 3 | 1 | 2 | 102.0 | 93 | 45 | 7 | 38 | 73 |
| Tony Orrego | 1974-1975 | 1 | 1 | .500 | 6.57 | 9 | 0 | 0 | 0 | 0 | 24.2 | 27 | 18 | 5 | 12 | 14 |
| Marcos Ortega | 1971-1971 | 5 | 1 | .833 | 3.14 | 10 | 10 | 3 | 1 | 0 | 77.1 | 65 | 27 | 8 | 28 | 41 |
| Andrew Ortiz | 1981-1981 | 4 | 4 | .500 | 5.10 | 13 | 13 | 0 | 0 | 0 | 72.1 | 64 | 41 | 9 | 28 | 61 |
| Leonardo Ortiz | 1979-1979 | 0 | 0 | .000 | 1.23 | 3 | 0 | 0 | 0 | 1 | 7.1 | 3 | 1 | 0 | 0 | 11 |
| Nelson Ortiz | 1972-1972 | 1 | 0 | 1.000 | 1.98 | 2 | 2 | 0 | 0 | 0 | 13.2 | 13 | 3 | 1 | 1 | 12 |
| Jeffrey Orville | 1977-1978 | 3 | 3 | .500 | 3.03 | 29 | 0 | 0 | 0 | 5 | 35.2 | 32 | 12 | 4 | 19 | 29 |
| Ozzie Osborn | 1968-1968 | 1 | 0 | 1.000 | 0.00 | 5 | 0 | 0 | 0 | 1 | 6.0 | 2 | 0 | 0 | 0 | 7 |
| Alan Owens | 1977-1979 | 0 | 0 | .000 | 6.97 | 6 | 0 | 0 | 0 | 0 | 10.1 | 10 | 8 | 2 | 7 | 4 |
| Rick Ownbey | 1979-1979 | 1 | 0 | 1.000 | 5.40 | 3 | 0 | 0 | 0 | 1 | 5.0 | 6 | 3 | 0 | 6 | 6 |
