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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Kenneth O'Brien | 1970-1975 | 18 | 17 | .514 | 4.01 | 103 | 43 | 1 | 0 | 9 | 339.0 | 338 | 151 | 35 | 163 | 211 |
| Robert O'Brien | 1969-1969 | 10 | 10 | .500 | 2.53 | 28 | 28 | 8 | 2 | 0 | 160.0 | 124 | 45 | 3 | 126 | 150 |
| Steven O'Brien | 1975-1977 | 17 | 14 | .548 | 4.10 | 69 | 35 | 14 | 3 | 0 | 329.2 | 289 | 150 | 32 | 195 | 187 |
| Tommy O'Brien | 1954-1955 | 0 | 0 | .000 | 3.60 | 5 | 0 | 0 | 0 | 2 | 5.0 | 3 | 2 | 0 | 3 | 3 |
| Jack W O'Connor | 1976-1976 | 5 | 3 | .625 | 2.60 | 9 | 9 | 4 | 2 | 0 | 72.2 | 63 | 21 | 5 | 22 | 35 |
| Rick O'Keeffe | 1977-1977 | 11 | 7 | .611 | 2.64 | 24 | 24 | 5 | 2 | 0 | 181.0 | 147 | 53 | 8 | 93 | 117 |
| Raymond O'Neill | 1968-1968 | 12 | 9 | .571 | 2.75 | 26 | 25 | 7 | 3 | 0 | 167.0 | 156 | 51 | 4 | 58 | 114 |
| Timothy O'Neill | 1978-1980 | 2 | 1 | .667 | 5.25 | 9 | 0 | 0 | 0 | 1 | 12.0 | 11 | 7 | 4 | 7 | 7 |
| Chuck Oertel | 1959-1959 | 0 | 0 | .000 | 4.50 | 1 | 0 | 0 | 0 | 0 | 2.0 | 3 | 1 | 0 | 1 | 1 |
| Jim Officer | 1974-1975 | 30 | 18 | .625 | 2.59 | 54 | 54 | 25 | 10 | 0 | 433.2 | 298 | 125 | 28 | 190 | 437 |
| Maurice Ogier | 1965-1966 | 15 | 19 | .441 | 3.45 | 50 | 47 | 13 | 4 | 0 | 287.0 | 208 | 110 | 7 | 241 | 273 |
| Bob Ojeda | 1978-1978 | 6 | 17 | .261 | 4.37 | 34 | 22 | 18 | 1 | 2 | 204.0 | 213 | 99 | 20 | 91 | 128 |
| Max Oliveras | 1969-1974 | 0 | 0 | .000 | 4.50 | 2 | 0 | 0 | 0 | 0 | 2.0 | 3 | 1 | 0 | 1 | 1 |
| Chris Olsen | 1979-1981 | 8 | 15 | .348 | 6.12 | 89 | 21 | 0 | 0 | 2 | 233.2 | 270 | 159 | 19 | 128 | 112 |
| Lew Olsen | 1979-1979 | 0 | 0 | .000 | 3.63 | 9 | 0 | 0 | 0 | 0 | 17.1 | 15 | 7 | 2 | 9 | 21 |
| Mitchell Olson | 1969-1973 | 12 | 10 | .545 | 5.21 | 57 | 0 | 0 | 0 | 10 | 77.2 | 81 | 45 | 13 | 26 | 68 |
| Robert Oravec | 1980-1981 | 9 | 21 | .300 | 4.64 | 49 | 49 | 2 | 1 | 0 | 281.1 | 231 | 145 | 25 | 173 | 187 |
| Alex Orozco | 1981-1981 | 13 | 4 | .765 | 3.34 | 21 | 21 | 12 | 3 | 0 | 169.2 | 125 | 63 | 14 | 72 | 139 |
| Seth Orr | 1976-1977 | 3 | 4 | .429 | 2.75 | 38 | 0 | 0 | 0 | 2 | 59.0 | 49 | 18 | 5 | 15 | 48 |
| Jose Ortiz | 1980-1981 | 17 | 6 | .739 | 4.62 | 33 | 33 | 9 | 1 | 0 | 237.2 | 236 | 122 | 22 | 101 | 134 |
| Leonardo Ortiz | 1979-1979 | 0 | 2 | .000 | 21.00 | 5 | 0 | 0 | 0 | 0 | 6.0 | 12 | 14 | 3 | 11 | 3 |
| Nelson Ortiz | 1972-1972 | 0 | 0 | .000 | 2.70 | 2 | 0 | 0 | 0 | 0 | 3.1 | 5 | 1 | 0 | 3 | 3 |
| Ozzie Osborn | 1968-1969 | 11 | 14 | .440 | 2.21 | 41 | 28 | 9 | 4 | 6 | 216.0 | 166 | 53 | 3 | 84 | 124 |
| Darrell Osteen | 1962-1963 | 14 | 12 | .538 | 3.62 | 45 | 30 | 7 | 1 | 3 | 226.0 | 222 | 91 | 8 | 141 | 177 |
| Jim Otten | 1978-1978 | 1 | 0 | 1.000 | 2.08 | 4 | 0 | 0 | 0 | 0 | 13.0 | 14 | 3 | 1 | 6 | 7 |
| Jim Owens | 1956-1956 | 5 | 7 | .417 | 2.86 | 15 | 14 | 6 | 1 | 0 | 104.0 | 94 | 33 | 4 | 57 | 62 |
| Madison Owens | 1976-1976 | 2 | 5 | .286 | 5.10 | 29 | 9 | 0 | 0 | 2 | 90.0 | 90 | 51 | 13 | 49 | 55 |
| Rick Ownbey | 1980-1980 | 6 | 9 | .400 | 4.35 | 20 | 20 | 6 | 1 | 0 | 138.2 | 122 | 67 | 12 | 62 | 110 |
