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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 |
|---|---|---|---|---|---|---|---|---|---|
| Larry O'Brien | 1970-1975 | .232 | 2 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Pete M O'Brien | 1978-1979 | .275 | 9 | 80 | 0 | 0 | 0 | 0.00 | 0 |
| Steven O'Brien | 1973-1974 | .000 | 0 | 0 | 15 | 25 | 0 | 4.67 | 231 |
| Syd O'Brien | 1964-1964 | .320 | 11 | 55 | 0 | 0 | 0 | 63.00 | 0 |
| Thomas O'Brien | 1971-1974 | .236 | 15 | 87 | 0 | 0 | 0 | 0.00 | 0 |
| J.P. O'Connor | 1979-1979 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Tim O'Hara | 1973-1973 | .304 | 4 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Robert O'Leath | 1981-1981 | .229 | 5 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Jared O'Nan | 1972-1973 | .224 | 12 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Jerry O'Neill | 1973-1979 | .000 | 0 | 0 | 4 | 9 | 17 | 3.81 | 100 |
| Don O'Riley | 1965-1966 | .118 | 1 | 2 | 13 | 10 | 18 | 2.66 | 214 |
| Evan O'Rourke | 1972-1975 | .000 | 0 | 0 | 19 | 20 | 0 | 3.92 | 201 |
| Denny O'Toole | 1969-1973 | .381 | 0 | 4 | 14 | 4 | 1 | 3.06 | 118 |
| James Oates | 1981-1981 | .000 | 0 | 0 | 0 | 1 | 0 | 9.07 | 21 |
| David Obal | 1973-1974 | .239 | 9 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Ken Oberkfell | 1976-1976 | .295 | 8 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Rick Odekirk | 1980-1980 | .000 | 0 | 0 | 1 | 0 | 0 | 4.85 | 17 |
| Jim Officer | 1970-1970 | .000 | 0 | 0 | 4 | 3 | 0 | 3.38 | 87 |
| John Ogden | 1972-1975 | .000 | 0 | 0 | 9 | 7 | 11 | 3.43 | 142 |
| Oswaldo Olivares | 1974-1975 | .203 | 12 | 73 | 0 | 0 | 0 | 10.80 | 1 |
| Bailey Oliver | 1975-1975 | .143 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Olivo | 1965-1966 | .091 | 0 | 4 | 7 | 7 | 1 | 3.47 | 122 |
| Al Olmsted | 1979-1980 | .000 | 0 | 0 | 4 | 4 | 7 | 3.69 | 25 |
| Dean Olson | 1973-1976 | .000 | 0 | 0 | 13 | 7 | 1 | 3.51 | 141 |
| Larry Olson | 1977-1981 | .207 | 10 | 71 | 0 | 0 | 0 | 0.00 | 0 |
| Martin Olson | 1968-1970 | .190 | 10 | 31 | 0 | 0 | 0 | 9.00 | 2 |
| Thomas Olszak | 1979-1981 | .238 | 13 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Ed Olszta | 1973-1974 | .204 | 20 | 95 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Ondina | 1973-1974 | .239 | 14 | 64 | 0 | 0 | 0 | 0.00 | 0 |
| Steve R Ontiveros | 1970-1970 | .302 | 4 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Tony Ordenana | 1942-1942 | .196 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Edward Orick | 1977-1977 | .000 | 0 | 0 | 5 | 3 | 0 | 4.10 | 25 |
| Mike Orozco | 1972-1976 | .203 | 8 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| John Orsino | 1957-1957 | .223 | 20 | 79 | 0 | 0 | 0 | 0.00 | 0 |
| Marcos Ortega | 1974-1974 | .000 | 0 | 0 | 16 | 2 | 0 | 2.24 | 130 |
| Jordan Ortiz | 1977-1977 | .000 | 0 | 0 | 3 | 7 | 0 | 2.82 | 78 |
| Jose L Ortiz | 1967-1967 | .282 | 1 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Nelson Ortiz | 1973-1973 | .000 | 0 | 0 | 0 | 2 | 0 | 2.05 | 24 |
| Reyes Ortiz | 1968-1974 | .284 | 12 | 80 | 0 | 0 | 0 | 0.00 | 0 |
| Vicente Ortiz | 1972-1977 | .210 | 3 | 38 | 0 | 0 | 0 | 15.43 | 0 |
| Matt Osmanski | 1973-1973 | .000 | 0 | 0 | 0 | 0 | 1 | 0.00 | 2 |
| Juan Osorio | 1977-1977 | .151 | 0 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Stanley Osterbur | 1981-1981 | .000 | 0 | 0 | 2 | 10 | 0 | 7.76 | 37 |
| James Otto | 1971-1973 | .234 | 19 | 82 | 0 | 0 | 0 | 0.00 | 0 |
| Stubby Overmire | 1959-1959 | .000 | 0 | 0 | 0 | 0 | 0 | 3.60 | 2 |
| Tom Owens | 1978-1979 | .000 | 0 | 0 | 14 | 12 | 0 | 3.37 | 181 |
