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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | G | GS | AB | R | H | 2B | 3B | HR | RBI | SB | CS | BB | SO | AVG | OBP | SLG | OPS | WAR |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Syd O'Brien | 1966-1966 | 18 | 18 | 68 | 14 | 21 | 4 | 0 | 3 | 8 | 1 | 1 | 10 | 11 | .309 | .412 | .500 | .912 | 0.7 |
| Patrick O'Keefe | 1971-1971 | 87 | 82 | 302 | 35 | 81 | 18 | 1 | 2 | 29 | 4 | 0 | 42 | 50 | .268 | .357 | .354 | .711 | 1.3 |
| Tom O'Malley | 1979-1979 | 66 | 66 | 244 | 39 | 74 | 8 | 2 | 4 | 36 | 0 | 0 | 44 | 22 | .303 | .405 | .402 | .807 | 1.7 |
| John O'Neil | 1954-1954 | 84 | 83 | 291 | 40 | 81 | 18 | 2 | 2 | 39 | 6 | 2 | 42 | 22 | .278 | .369 | .375 | .744 | 1.2 |
| Frank Obermeier | 1970-1974 | 193 | 39 | 238 | 27 | 63 | 13 | 1 | 5 | 30 | 0 | 1 | 29 | 52 | .265 | .350 | .391 | .741 | 0.9 |
| Francisco Obregon | 1958-1958 | 135 | 135 | 560 | 121 | 152 | 17 | 4 | 7 | 65 | 21 | 10 | 90 | 68 | .271 | .378 | .354 | .732 | 2.6 |
| Ron Oddo | 1981-1981 | 100 | 98 | 332 | 45 | 93 | 9 | 2 | 0 | 44 | 4 | 3 | 70 | 25 | .280 | .408 | .319 | .728 | 2.2 |
| John Olerud | 1966-1967 | 138 | 136 | 510 | 62 | 147 | 18 | 4 | 2 | 50 | 4 | 2 | 36 | 69 | .288 | .338 | .351 | .689 | 0.7 |
| Fernando Olivero | 1981-1981 | 58 | 58 | 238 | 36 | 63 | 18 | 1 | 4 | 25 | 6 | 3 | 11 | 13 | .265 | .299 | .399 | .698 | 0.4 |
| Mike Olivo | 1966-1966 | 17 | 9 | 36 | 2 | 7 | 0 | 0 | 1 | 3 | 0 | 0 | 0 | 6 | .194 | .194 | .278 | .472 | -0.2 |
| Blake Olsen | 1974-1975 | 57 | 54 | 179 | 18 | 33 | 8 | 0 | 0 | 20 | 2 | 3 | 11 | 21 | .184 | .234 | .229 | .463 | -0.9 |
| Karl Olson | 1948-1948 | 70 | 70 | 276 | 41 | 82 | 13 | 7 | 2 | 35 | 1 | 1 | 24 | 39 | .297 | .353 | .417 | .770 | 1.1 |
| Martin Olson | 1969-1969 | 100 | 94 | 345 | 40 | 87 | 13 | 2 | 10 | 45 | 2 | 3 | 31 | 59 | .252 | .322 | .388 | .710 | 0.8 |
| Thomas Olszak | 1981-1981 | 11 | 4 | 23 | 4 | 5 | 2 | 0 | 0 | 2 | 0 | 0 | 1 | 5 | .217 | .308 | .304 | .612 | -0.1 |
| Paul Ondo | 1980-1981 | 82 | 63 | 240 | 23 | 59 | 16 | 7 | 0 | 27 | 0 | 1 | 27 | 28 | .246 | .326 | .371 | .697 | 0.9 |
| Curt Oriani | 1972-1973 | 196 | 196 | 791 | 105 | 210 | 49 | 0 | 8 | 71 | 1 | 4 | 77 | 100 | .265 | .333 | .358 | .691 | 2.6 |
| Paul Orlowski | 1974-1976 | 245 | 226 | 891 | 132 | 241 | 26 | 13 | 29 | 120 | 32 | 24 | 99 | 91 | .270 | .349 | .426 | .775 | 6.7 |
| Maury Ornest | 1979-1979 | 64 | 62 | 230 | 38 | 53 | 6 | 3 | 10 | 41 | 6 | 5 | 39 | 51 | .230 | .342 | .413 | .755 | 1.0 |
| James Oros | 1981-1981 | 83 | 81 | 297 | 50 | 70 | 7 | 3 | 19 | 74 | 2 | 0 | 59 | 42 | .236 | .357 | .471 | .829 | 2.8 |
