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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 | 1964-1966 | 0 | 0 | .000 | 63.00 | 2 | 0 | 0 | 0 | 0 | 2.0 | 14 | 14 | 0 | 4 | 0 |
| Timothy O'Connell | 1969-1969 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 3.0 | 1 | 0 | 0 | 4 | 3 |
| Emmett O'Neill | 1950-1950 | 7 | 7 | .500 | 4.09 | 19 | 15 | 6 | 1 | 1 | 121.0 | 115 | 55 | 4 | 75 | 67 |
| Jerry O'Neill | 1971-1975 | 17 | 20 | .459 | 3.60 | 104 | 34 | 9 | 2 | 5 | 375.1 | 339 | 150 | 28 | 169 | 257 |
| Raymond O'Neill | 1969-1970 | 20 | 17 | .541 | 3.00 | 50 | 45 | 16 | 2 | 1 | 312.0 | 272 | 104 | 19 | 151 | 247 |
| Don O'Riley | 1967-1967 | 2 | 3 | .400 | 2.13 | 42 | 0 | 0 | 0 | 15 | 76.0 | 61 | 18 | 3 | 38 | 72 |
| Justin O'Shea | 1973-1973 | 0 | 2 | .000 | 5.83 | 27 | 0 | 0 | 0 | 1 | 41.2 | 51 | 27 | 7 | 26 | 27 |
| Orlando Ochoa | 1981-1981 | 0 | 0 | .000 | 1.57 | 27 | 0 | 0 | 0 | 0 | 40.0 | 29 | 7 | 1 | 14 | 38 |
| Raymie Odermott | 1980-1980 | 2 | 0 | 1.000 | 1.57 | 2 | 2 | 2 | 0 | 0 | 23.0 | 20 | 4 | 1 | 1 | 8 |
| Dave Odom | 1946-1946 | 0 | 1 | .000 | 12.60 | 2 | 1 | 0 | 0 | 0 | 5.0 | 10 | 7 | 1 | 4 | 3 |
| Maurice Ogier | 1967-1967 | 13 | 12 | .520 | 3.68 | 26 | 26 | 10 | 3 | 0 | 164.0 | 140 | 67 | 15 | 86 | 170 |
| Ron Oglesby | 1969-1969 | 7 | 10 | .412 | 3.50 | 25 | 17 | 6 | 1 | 0 | 121.0 | 120 | 47 | 2 | 42 | 87 |
| Len Okrie | 1957-1957 | 0 | 1 | .000 | 4.20 | 1 | 1 | 0 | 0 | 0 | 15.0 | 16 | 7 | 2 | 6 | 9 |
| Bob Oliver | 1964-1964 | 0 | 0 | .000 | 9.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 1 | 1 | 0 | 2 | 0 |
| Jim Ollom | 1965-1965 | 7 | 11 | .389 | 3.42 | 24 | 24 | 9 | 2 | 0 | 150.0 | 112 | 57 | 10 | 67 | 125 |
| Lew Olsen | 1973-1979 | 2 | 1 | .667 | 2.21 | 10 | 1 | 0 | 0 | 2 | 20.1 | 13 | 5 | 2 | 12 | 15 |
| Bruce Olson | 1969-1974 | 59 | 46 | .562 | 3.93 | 142 | 139 | 42 | 4 | 0 | 997.1 | 1055 | 435 | 89 | 326 | 558 |
| Clinton Olson | 1970-1978 | 1 | 5 | .167 | 8.63 | 15 | 3 | 1 | 0 | 2 | 32.1 | 59 | 31 | 2 | 24 | 17 |
| Richard Ordway | 1967-1970 | 3 | 2 | .600 | 3.96 | 33 | 6 | 2 | 0 | 3 | 84.0 | 75 | 37 | 7 | 55 | 54 |
| Robert Ormond | 1970-1970 | 5 | 3 | .625 | 4.23 | 11 | 11 | 0 | 0 | 0 | 72.1 | 79 | 34 | 4 | 18 | 46 |
| Jesse Orosco | 1978-1978 | 3 | 6 | .333 | 3.22 | 32 | 0 | 0 | 0 | 9 | 50.1 | 55 | 18 | 4 | 15 | 47 |
| Bobo Osborne | 1954-1954 | 0 | 0 | .000 | 4.50 | 2 | 0 | 0 | 0 | 0 | 6.0 | 6 | 3 | 0 | 2 | 1 |
| William Osborne | 1976-1976 | 4 | 3 | .571 | 2.75 | 24 | 8 | 0 | 0 | 2 | 75.1 | 70 | 23 | 3 | 28 | 42 |
| Matt Osmanski | 1977-1978 | 5 | 2 | .714 | 5.18 | 29 | 1 | 1 | 0 | 3 | 48.2 | 55 | 28 | 11 | 26 | 31 |
| Darrell Osteen | 1963-1963 | 0 | 1 | .000 | 3.24 | 11 | 2 | 0 | 0 | 2 | 25.0 | 23 | 9 | 3 | 17 | 21 |
| Mike Overy | 1975-1977 | 14 | 13 | .519 | 3.42 | 88 | 0 | 0 | 0 | 31 | 137.0 | 115 | 52 | 14 | 52 | 154 |
| James Owen | 1977-1977 | 7 | 5 | .583 | 5.45 | 36 | 0 | 0 | 0 | 20 | 36.1 | 35 | 22 | 7 | 29 | 31 |
| Alan Owens | 1978-1981 | 3 | 3 | .500 | 6.47 | 23 | 3 | 0 | 0 | 0 | 57.0 | 59 | 41 | 8 | 30 | 36 |
| Madison Owens | 1978-1980 | 19 | 18 | .514 | 4.94 | 58 | 53 | 9 | 2 | 0 | 351.2 | 375 | 193 | 21 | 191 | 198 |
| Donald Oxidine | 1972-1975 | 7 | 7 | .500 | 4.12 | 32 | 18 | 2 | 1 | 1 | 148.2 | 147 | 68 | 11 | 63 | 89 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
