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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Bob O'Brien | 1970-1975 | 18 | 6 | .750 | 3.32 | 77 | 26 | 12 | 3 | 1 | 300.2 | 249 | 111 | 31 | 102 | 220 |
| Dan O'Brien | 1977-1979 | 1 | 2 | .333 | 2.20 | 20 | 0 | 0 | 0 | 5 | 28.2 | 26 | 7 | 1 | 6 | 13 |
| Eddie O'Brien | 1957-1958 | 9 | 11 | .450 | 4.29 | 37 | 15 | 4 | 2 | 4 | 149.0 | 139 | 71 | 11 | 73 | 81 |
| Johnny O'Brien | 1960-1960 | 0 | 0 | .000 | 4.50 | 1 | 1 | 0 | 0 | 0 | 8.0 | 8 | 4 | 1 | 3 | 5 |
| Tommy O'Brien | 1946-1946 | 0 | 0 | .000 | 4.50 | 2 | 0 | 0 | 0 | 1 | 2.0 | 1 | 1 | 0 | 1 | 1 |
| George O'Donnell | 1953-1960 | 56 | 38 | .596 | 3.37 | 277 | 61 | 29 | 5 | 47 | 834.191 | 869 | 336 | 57 | 201 | 232 |
| John E O'Donoghue | 1963-1970 | 3 | 5 | .375 | 3.44 | 16 | 2 | 0 | 0 | 3 | 34.0 | 43 | 13 | 2 | 19 | 25 |
| John O'Neil | 1943-1953 | 0 | 0 | .000 | 4.50 | 12 | 0 | 0 | 0 | 0 | 96.0 | 156 | 48 | 12 | 48 | 96 |
| Emmett O'Neill | 1946-1948 | 0 | 2 | .000 | 4.64 | 34 | 11 | 1 | 0 | 4 | 97.0 | 87 | 50 | 9 | 91 | 30 |
| Jerry O'Neill | 1980-1981 | 17 | 7 | .708 | 3.23 | 36 | 36 | 0 | 0 | 0 | 222.2 | 160 | 80 | 21 | 100 | 232 |
| Don O'Riley | 1968-1968 | 4 | 5 | .444 | 3.26 | 49 | 1 | 0 | 0 | 11 | 102.0 | 97 | 37 | 9 | 36 | 64 |
| Jim O'Toole | 1968-1968 | 2 | 8 | .200 | 5.53 | 16 | 13 | 1 | 0 | 0 | 57.0 | 64 | 35 | 5 | 17 | 39 |
| Francisco Obregon | 1960-1960 | 0 | 0 | .000 | 5.63 | 3 | 0 | 0 | 0 | 1 | 8.0 | 10 | 5 | 2 | 2 | 5 |
| Benjamin Ochoa | 1971-1972 | 12 | 3 | .800 | 2.47 | 19 | 19 | 11 | 2 | 0 | 163.2 | 128 | 45 | 11 | 56 | 135 |
| Blue Moon Odom | 1967-1980 | 5 | 2 | .714 | 2.89 | 25 | 6 | 2 | 0 | 0 | 74.2 | 70 | 24 | 6 | 40 | 56 |
| Chuck Oertel | 1956-1960 | 1 | 0 | 1.000 | 4.50 | 2 | 0 | 0 | 0 | 0 | 4.0 | 6 | 2 | 0 | 2 | 2 |
| John Ogden | 1979-1980 | 0 | 2 | .000 | 7.31 | 15 | 0 | 0 | 0 | 1 | 16.0 | 18 | 13 | 3 | 16 | 15 |
| Mike Olivo | 1968-1968 | 1 | 6 | .143 | 4.17 | 8 | 8 | 0 | 0 | 0 | 41.0 | 44 | 19 | 8 | 13 | 20 |
| Al Olmsted | 1981-1981 | 1 | 0 | 1.000 | 3.97 | 21 | 0 | 0 | 0 | 0 | 47.2 | 46 | 21 | 10 | 18 | 40 |
| Ismael Oquendo | 1980-1980 | 0 | 0 | .000 | 6.75 | 1 | 0 | 0 | 0 | 0 | 1.1 | 0 | 1 | 0 | 3 | 0 |
| Joe Orengo | 1946-1946 | 1 | 0 | 1.000 | 5.40 | 3 | 1 | 0 | 0 | 0 | 10.0 | 13 | 6 | 1 | 8 | 6 |
| Joe Orrell | 1940-1948 | 32 | 61 | .344 | 4.04 | 139 | 94 | 48 | 9 | 6 | 771.0 | 797 | 346 | 52 | 341 | 378 |
| Phil Ortega | 1959-1970 | 35 | 40 | .467 | 4.67 | 113 | 99 | 23 | 4 | 2 | 612.2 | 603 | 318 | 55 | 329 | 419 |
| Jordan Ortiz | 1979-1980 | 1 | 5 | .167 | 3.74 | 53 | 0 | 0 | 0 | 34 | 55.1 | 50 | 23 | 5 | 22 | 58 |
| Nelson Ortiz | 1974-1974 | 1 | 2 | .333 | 4.58 | 5 | 5 | 2 | 0 | 0 | 37.1 | 33 | 19 | 4 | 12 | 21 |
| Wayne Osborne | 1940-1943 | 59 | 62 | .488 | 4.38 | 160 | 122 | 64 | 3 | 8 | 946.0 | 1097 | 460 | 63 | 318 | 268 |
| Joe Ostrowski | 1953-1953 | 3 | 6 | .333 | 2.27 | 28 | 3 | 0 | 0 | 6 | 74.64 | 77 | 24 | 6 | 14 | 16 |
| Bob Owchinko | 1980-1981 | 6 | 3 | .667 | 2.87 | 37 | 0 | 0 | 0 | 4 | 47.0 | 32 | 15 | 3 | 18 | 28 |
| Tom Owens | 1980-1980 | 5 | 4 | .556 | 2.95 | 16 | 14 | 0 | 0 | 0 | 91.2 | 72 | 30 | 8 | 31 | 64 |
