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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Syd O'Brien | 1965-1971 | 0 | 0 | .000 | 63.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 7 | 7 | 0 | 2 | 0 |
| Tommy O'Brien | 1941-1941 | 0 | 0 | .000 | 4.50 | 2 | 0 | 0 | 0 | 1 | 2.0 | 1 | 1 | 0 | 1 | 1 |
| Jack W O'Connor | 1979-1980 | 15 | 11 | .577 | 3.62 | 41 | 41 | 8 | 2 | 0 | 298.1 | 252 | 120 | 27 | 150 | 244 |
| Raymond O'Neill | 1969-1969 | 0 | 1 | .000 | 7.71 | 6 | 1 | 0 | 0 | 1 | 7.0 | 8 | 6 | 2 | 5 | 6 |
| Don O'Riley | 1967-1967 | 1 | 1 | .500 | 1.50 | 3 | 0 | 0 | 0 | 1 | 6.0 | 5 | 1 | 0 | 2 | 5 |
| Evan O'Rourke | 1975-1975 | 7 | 4 | .636 | 3.34 | 18 | 18 | 5 | 2 | 0 | 126.2 | 89 | 47 | 9 | 60 | 97 |
| Denny O'Toole | 1970-1970 | 1 | 1 | .500 | 3.58 | 12 | 0 | 0 | 0 | 5 | 32.2 | 28 | 13 | 5 | 14 | 18 |
| Francisco Obregon | 1964-1965 | 0 | 0 | .000 | 5.63 | 6 | 0 | 0 | 0 | 2 | 16.0 | 20 | 10 | 4 | 4 | 10 |
| Benjamin Ochoa | 1971-1971 | 9 | 4 | .692 | 2.92 | 19 | 19 | 6 | 1 | 0 | 151.0 | 114 | 49 | 20 | 62 | 130 |
| Blue Moon Odom | 1964-1966 | 18 | 10 | .643 | 3.52 | 35 | 35 | 13 | 1 | 0 | 240.0 | 221 | 94 | 9 | 113 | 165 |
| Maurice Ogier | 1968-1968 | 2 | 2 | .500 | 6.00 | 7 | 5 | 3 | 0 | 0 | 30.0 | 20 | 20 | 4 | 21 | 24 |
| Ron Oglesby | 1970-1971 | 14 | 12 | .538 | 4.31 | 78 | 24 | 6 | 1 | 1 | 301.0 | 271 | 144 | 40 | 142 | 224 |
| Bob Oliver | 1965-1967 | 0 | 0 | .000 | 9.00 | 3 | 0 | 0 | 0 | 0 | 3.0 | 3 | 3 | 0 | 6 | 0 |
| Mike Olivo | 1967-1970 | 23 | 20 | .535 | 3.21 | 55 | 50 | 19 | 5 | 2 | 358.2 | 313 | 128 | 30 | 104 | 240 |
| Jim Ollom | 1968-1969 | 10 | 4 | .714 | 4.32 | 26 | 18 | 5 | 1 | 0 | 102.0 | 92 | 49 | 7 | 50 | 52 |
| Al Olmsted | 1980-1980 | 9 | 7 | .563 | 3.27 | 19 | 19 | 5 | 0 | 0 | 146.0 | 112 | 53 | 8 | 58 | 92 |
| Dean Olson | 1978-1979 | 28 | 28 | .500 | 3.91 | 71 | 62 | 22 | 1 | 1 | 472.0 | 379 | 205 | 49 | 279 | 378 |
| Marcos Ortega | 1975-1975 | 12 | 2 | .857 | 0.76 | 17 | 14 | 1 | 1 | 0 | 106.0 | 45 | 9 | 1 | 24 | 106 |
| Jordan Ortiz | 1981-1981 | 3 | 3 | .500 | 5.37 | 11 | 10 | 0 | 0 | 0 | 58.2 | 47 | 35 | 5 | 39 | 40 |
| Nelson Ortiz | 1973-1979 | 55 | 36 | .604 | 3.33 | 135 | 126 | 10 | 1 | 2 | 814.1 | 659 | 301 | 69 | 279 | 510 |
| Roberto Ortiz | 1940-1941 | 22 | 15 | .595 | 4.44 | 48 | 40 | 14 | 3 | 1 | 314.0 | 305 | 155 | 31 | 120 | 207 |
| Ozzie Osborn | 1972-1974 | 25 | 37 | .403 | 4.30 | 84 | 84 | 16 | 1 | 0 | 587.2 | 557 | 281 | 67 | 233 | 312 |
| Darrell Osteen | 1964-1965 | 24 | 13 | .649 | 3.05 | 78 | 14 | 4 | 0 | 19 | 239.0 | 179 | 81 | 17 | 138 | 204 |
| Amos Otis | 1967-1968 | 0 | 0 | .000 | 0.00 | 2 | 0 | 0 | 0 | 0 | 2.0 | 4 | 0 | 0 | 2 | 2 |
| Bob Owchinko | 1976-1977 | 9 | 7 | .563 | 2.56 | 30 | 18 | 5 | 0 | 5 | 158.1 | 127 | 45 | 10 | 52 | 83 |
