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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
|---|---|---|---|---|---|---|---|---|---|
| Kevin O'Brien | 1980-1981 | .200 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Syd O'Brien | 1964-1966 | .294 | 12 | 49 | 0 | 0 | 0 | 63.00 | 0 |
| Timothy O'Connell | 1969-1969 | .304 | 7 | 52 | 0 | 0 | 0 | 0.00 | 3 |
| J.P. O'Connor | 1978-1979 | .144 | 2 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Tyler O'Dell | 1972-1972 | .220 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Kenneth O'Donnell | 1969-1969 | .195 | 0 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Tim O'Hara | 1973-1973 | .308 | 6 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Sean O'Leary | 1979-1980 | .232 | 1 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Emmett O'Neill | 1950-1950 | .189 | 0 | 2 | 7 | 7 | 1 | 4.09 | 67 |
| Jerry O'Neill | 1971-1975 | .000 | 0 | 0 | 17 | 20 | 5 | 3.60 | 257 |
| Patrick O'Neill | 1974-1974 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Paul O'Neill | 1975-1976 | .205 | 3 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Paul O'Neill | 1980-1980 | .268 | 6 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Raymond O'Neill | 1969-1970 | .188 | 0 | 8 | 20 | 17 | 1 | 3.00 | 247 |
| Don O'Riley | 1967-1967 | .158 | 0 | 0 | 2 | 3 | 15 | 2.13 | 72 |
| Justin O'Shea | 1973-1973 | .000 | 0 | 0 | 0 | 2 | 1 | 5.83 | 27 |
| Orlando Ochoa | 1981-1981 | .000 | 0 | 0 | 0 | 0 | 0 | 1.57 | 38 |
| Raymie Odermott | 1980-1980 | .000 | 0 | 0 | 2 | 0 | 0 | 1.57 | 8 |
| Dave Odom | 1946-1946 | .250 | 0 | 0 | 0 | 1 | 0 | 12.60 | 3 |
| Ron Oester | 1973-1974 | .199 | 0 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Maurice Ogier | 1967-1967 | .158 | 0 | 4 | 13 | 12 | 0 | 3.68 | 170 |
| Robin Ogle | 1976-1976 | .417 | 3 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Ron Oglesby | 1969-1969 | .162 | 0 | 4 | 7 | 10 | 0 | 3.50 | 87 |
| Len Okrie | 1957-1957 | .000 | 0 | 0 | 0 | 1 | 0 | 4.20 | 9 |
| Steven Oliva | 1974-1974 | .667 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ed Olivares | 1960-1960 | .317 | 35 | 125 | 0 | 0 | 0 | 0.00 | 0 |
| Ramon Olivares | 1981-1981 | .125 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Al Oliver | 1966-1967 | .299 | 12 | 72 | 0 | 0 | 0 | 0.00 | 0 |
| Bob Oliver | 1964-1964 | .260 | 7 | 73 | 0 | 0 | 0 | 9.00 | 0 |
| Gene Oliver | 1957-1957 | .285 | 30 | 81 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Max Oliveras | 1970-1970 | .262 | 1 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Charles Ollar | 1976-1978 | .240 | 4 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Jim Ollom | 1965-1965 | .077 | 0 | 1 | 7 | 11 | 0 | 3.42 | 125 |
| Lew Olsen | 1973-1979 | .000 | 0 | 0 | 2 | 1 | 2 | 2.21 | 15 |
| Bruce Olson | 1969-1974 | .175 | 0 | 5 | 59 | 46 | 0 | 3.93 | 558 |
| Clinton Olson | 1970-1978 | .158 | 0 | 3 | 1 | 5 | 2 | 8.63 | 17 |
| Tod Olson | 1976-1979 | .236 | 14 | 66 | 0 | 0 | 0 | 0.00 | 0 |
| Hector Ordonez | 1980-1981 | .262 | 3 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Richard Ordway | 1967-1970 | .067 | 0 | 0 | 3 | 2 | 3 | 3.96 | 54 |
| Herbert Orensky | 1979-1979 | .297 | 6 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Robert Ormond | 1970-1970 | .000 | 0 | 0 | 5 | 3 | 0 | 4.23 | 46 |
| Michael Ornest | 1981-1981 | .192 | 7 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Jesse Orosco | 1978-1978 | .000 | 0 | 0 | 3 | 6 | 9 | 3.22 | 47 |
| Joe Orsulak | 1981-1981 | .317 | 4 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Armando Ortiz | 1977-1978 | .175 | 7 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Junior Ortiz | 1978-1979 | .267 | 6 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ortiz | 1978-1978 | .167 | 0 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Monte Ortiz | 1973-1973 | .256 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Reyes Ortiz | 1974-1974 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Bobo Osborne | 1954-1954 | .232 | 22 | 82 | 0 | 0 | 0 | 4.50 | 1 |
| William Osborne | 1976-1976 | .000 | 0 | 0 | 4 | 3 | 2 | 2.75 | 42 |
| Bob Osentoski | 1972-1972 | .181 | 8 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Matt Osmanski | 1977-1978 | .000 | 0 | 0 | 5 | 2 | 3 | 5.18 | 31 |
| Darrell Osteen | 1963-1963 | .000 | 0 | 0 | 0 | 1 | 2 | 3.24 | 21 |
| Ed Ott | 1970-1972 | .303 | 2 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Overy | 1975-1977 | .000 | 0 | 0 | 14 | 13 | 31 | 3.42 | 154 |
| James Owen | 1977-1977 | .000 | 0 | 0 | 7 | 5 | 20 | 5.45 | 31 |
| Larry Owen | 1977-1978 | .221 | 16 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Alan Owens | 1978-1981 | .000 | 0 | 0 | 3 | 3 | 0 | 6.47 | 36 |
| Madison Owens | 1978-1980 | .000 | 0 | 0 | 19 | 18 | 0 | 4.94 | 198 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Donald Oxidine | 1972-1975 | .000 | 0 | 0 | 7 | 7 | 1 | 4.12 | 89 |
