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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Kenneth O'Brien | 1974-1974 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 1 | 0 | 0 | 0 | 0 |
| Timothy O'Connell | 1968-1968 | 0 | 0 | .000 | 1.50 | 2 | 0 | 0 | 0 | 0 | 6.0 | 3 | 1 | 0 | 4 | 4 |
| Jack W O'Connor | 1975-1977 | 13 | 17 | .433 | 2.61 | 41 | 41 | 17 | 3 | 0 | 317.1 | 233 | 92 | 12 | 146 | 221 |
| Michael O'Connor | 1979-1980 | 1 | 0 | 1.000 | 6.35 | 4 | 0 | 0 | 0 | 1 | 5.2 | 5 | 4 | 0 | 5 | 1 |
| Rick O'Keeffe | 1976-1977 | 1 | 1 | .500 | 3.19 | 13 | 0 | 0 | 0 | 1 | 36.2 | 28 | 13 | 9 | 18 | 27 |
| Sean O'Leary | 1977-1980 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.2 | 1 | 0 | 0 | 0 | 0 |
| Randy O'Neal | 1981-1981 | 0 | 1 | .000 | 6.75 | 2 | 1 | 0 | 0 | 0 | 6.2 | 10 | 5 | 1 | 3 | 3 |
| John O'Neil | 1941-1954 | 0 | 0 | .000 | 4.50 | 2 | 0 | 0 | 0 | 0 | 16.0 | 26 | 8 | 2 | 8 | 16 |
| Jerry O'Neill | 1970-1970 | 1 | 0 | 1.000 | 3.65 | 2 | 1 | 1 | 0 | 0 | 12.1 | 13 | 5 | 3 | 2 | 12 |
| Orlando Ochoa | 1980-1980 | 0 | 0 | .000 | 2.61 | 6 | 0 | 0 | 0 | 0 | 10.1 | 9 | 3 | 2 | 4 | 10 |
| Jim Officer | 1973-1973 | 1 | 1 | .500 | 3.64 | 15 | 0 | 0 | 0 | 2 | 29.2 | 17 | 12 | 2 | 19 | 50 |
| Joe Olivas | 1979-1981 | 4 | 5 | .444 | 6.84 | 25 | 4 | 0 | 0 | 0 | 48.2 | 58 | 37 | 6 | 34 | 27 |
| Francisco Oliveras | 1980-1981 | 4 | 2 | .667 | 2.85 | 19 | 1 | 0 | 0 | 1 | 41.0 | 39 | 13 | 6 | 12 | 26 |
| William Olsen | 1968-1969 | 10 | 2 | .833 | 1.56 | 17 | 14 | 8 | 4 | 1 | 104.0 | 75 | 18 | 3 | 17 | 122 |
| Steve Ontiveros | 1981-1981 | 1 | 1 | .500 | 13.50 | 5 | 0 | 0 | 0 | 0 | 7.1 | 10 | 11 | 2 | 7 | 7 |
| Robert Oravec | 1979-1979 | 2 | 1 | .667 | 3.12 | 9 | 9 | 0 | 0 | 0 | 52.0 | 39 | 18 | 0 | 24 | 39 |
| Boyce Orosco | 1979-1979 | 0 | 1 | .000 | 3.75 | 3 | 2 | 0 | 0 | 0 | 12.0 | 11 | 5 | 2 | 2 | 7 |
| Seth Orr | 1974-1975 | 6 | 2 | .750 | 2.83 | 39 | 0 | 0 | 0 | 3 | 66.2 | 52 | 21 | 8 | 13 | 53 |
| Marcos Ortega | 1972-1973 | 7 | 5 | .583 | 3.13 | 22 | 22 | 3 | 1 | 0 | 144.0 | 119 | 50 | 14 | 55 | 112 |
| Antonio Ortiz | 1980-1981 | 6 | 6 | .500 | 5.11 | 13 | 13 | 5 | 0 | 0 | 88.0 | 85 | 50 | 3 | 53 | 52 |
| Jordan Ortiz | 1977-1980 | 9 | 7 | .563 | 4.54 | 27 | 25 | 1 | 0 | 0 | 158.2 | 146 | 80 | 13 | 76 | 105 |
| Jordan Ortiz | 1974-1974 | 0 | 0 | .000 | 3.75 | 6 | 0 | 0 | 0 | 0 | 12.0 | 14 | 5 | 1 | 8 | 4 |
| Jose Ortiz | 1977-1977 | 6 | 6 | .500 | 4.57 | 16 | 16 | 2 | 0 | 0 | 112.1 | 117 | 57 | 7 | 37 | 71 |
| Amos Otis | 1966-1966 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 2 | 0 | 0 | 1 | 1 |
| James Owen | 1971-1972 | 15 | 8 | .652 | 4.13 | 25 | 25 | 10 | 5 | 0 | 194.0 | 165 | 89 | 32 | 80 | 162 |
