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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 |
|---|---|---|---|---|---|---|---|---|---|
| Bob O'Brien | 1973-1973 | .000 | 0 | 0 | 11 | 2 | 16 | 1.96 | 75 |
| Kenneth O'Brien | 1970-1973 | .000 | 0 | 0 | 5 | 5 | 2 | 5.04 | 89 |
| Syd O'Brien | 1966-1966 | .309 | 3 | 8 | 0 | 0 | 0 | 63.00 | 0 |
| Patrick O'Keefe | 1971-1971 | .268 | 2 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Tom O'Malley | 1979-1979 | .303 | 4 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| John O'Neil | 1954-1954 | .278 | 2 | 39 | 0 | 0 | 0 | 4.50 | 8 |
| Timothy O'Neill | 1978-1981 | .000 | 0 | 0 | 3 | 2 | 2 | 0.31 | 13 |
| Evan O'Rourke | 1974-1975 | .000 | 0 | 0 | 7 | 8 | 0 | 3.01 | 81 |
| Justin O'Shea | 1971-1971 | .000 | 0 | 0 | 11 | 13 | 10 | 5.93 | 51 |
| Frank Obermeier | 1970-1974 | .265 | 5 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Obregon | 1958-1958 | .271 | 7 | 65 | 0 | 0 | 1 | 5.63 | 5 |
| Ron Oddo | 1981-1981 | .280 | 0 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Jim Officer | 1970-1970 | .000 | 0 | 0 | 0 | 0 | 0 | 13.50 | 3 |
| John Ogden | 1971-1971 | .000 | 0 | 0 | 5 | 6 | 7 | 3.46 | 90 |
| Tollinche Oikawa | 1971-1971 | .000 | 0 | 0 | 0 | 0 | 1 | 2.27 | 23 |
| John Olerud | 1966-1967 | .288 | 2 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Fernando Olivero | 1981-1981 | .265 | 4 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Olivo | 1966-1966 | .194 | 1 | 3 | 6 | 5 | 1 | 5.38 | 88 |
| Blake Olsen | 1974-1975 | .184 | 0 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Dean Olson | 1974-1977 | .000 | 0 | 0 | 15 | 25 | 0 | 3.42 | 183 |
| Karl Olson | 1948-1948 | .297 | 2 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Martin Olson | 1969-1969 | .252 | 10 | 45 | 0 | 0 | 0 | 9.00 | 2 |
| Mitchell Olson | 1970-1971 | .000 | 0 | 0 | 5 | 3 | 7 | 3.88 | 50 |
| Thomas Olszak | 1981-1981 | .217 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Paul Ondo | 1980-1981 | .246 | 0 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Curt Oriani | 1972-1973 | .265 | 8 | 71 | 0 | 0 | 0 | 0.00 | 0 |
| Paul Orlowski | 1974-1976 | .270 | 29 | 120 | 0 | 0 | 0 | 0.00 | 0 |
| Maury Ornest | 1979-1979 | .230 | 10 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| James Oros | 1981-1981 | .236 | 19 | 74 | 0 | 0 | 0 | 0.00 | 0 |
| Alex Orozco | 1980-1980 | .000 | 0 | 0 | 4 | 9 | 0 | 3.82 | 136 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Danny Ortiz | 1978-1981 | .000 | 0 | 0 | 21 | 24 | 0 | 4.06 | 232 |
| Nelson Ortiz | 1971-1971 | .000 | 0 | 0 | 2 | 1 | 3 | 2.73 | 47 |
| Jim Otten | 1972-1978 | .000 | 0 | 0 | 44 | 33 | 7 | 3.31 | 361 |
| Bob Owchinko | 1975-1976 | .000 | 0 | 0 | 17 | 13 | 0 | 3.64 | 168 |
