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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jim Officer | 1971-1971 | 5 | 17 | .227 | 4.15 | 27 | 27 | 8 | 3 | 0 | 186.1 | 179 | 86 | 16 | 109 | 192 |
| Bob Oliver | 1963-1963 | 0 | 0 | .000 | 9.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 1 | 1 | 0 | 2 | 0 |
| Max Oliveras | 1969-1974 | 0 | 0 | .000 | 1.80 | 3 | 0 | 0 | 0 | 0 | 5.0 | 3 | 1 | 0 | 4 | 3 |
| Mike Olivo | 1964-1964 | 1 | 1 | .500 | 3.52 | 4 | 3 | 1 | 0 | 0 | 23.0 | 22 | 9 | 0 | 11 | 37 |
| Clinton Olson | 1971-1976 | 7 | 6 | .538 | 3.18 | 39 | 0 | 0 | 0 | 8 | 51.0 | 52 | 18 | 6 | 14 | 26 |
| Robert Ormond | 1972-1975 | 42 | 43 | .494 | 3.94 | 108 | 107 | 25 | 1 | 0 | 760.1 | 742 | 333 | 50 | 278 | 385 |
| Jesse Orosco | 1978-1979 | 2 | 4 | .333 | 3.42 | 29 | 0 | 0 | 0 | 8 | 47.1 | 43 | 18 | 4 | 20 | 32 |
| Tony Orrego | 1975-1979 | 11 | 7 | .611 | 3.98 | 76 | 12 | 2 | 1 | 2 | 217.1 | 214 | 96 | 19 | 112 | 68 |
| Daniel Ortega | 1980-1981 | 17 | 16 | .515 | 3.99 | 41 | 41 | 11 | 3 | 0 | 291.1 | 224 | 129 | 23 | 165 | 219 |
| William Osborne | 1976-1976 | 0 | 2 | .000 | 5.14 | 6 | 5 | 1 | 0 | 1 | 35.0 | 29 | 20 | 0 | 18 | 16 |
| Donald Oxidine | 1972-1974 | 11 | 13 | .458 | 3.45 | 44 | 28 | 1 | 0 | 0 | 203.1 | 184 | 78 | 11 | 101 | 109 |
