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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nicholas O'Connor | 1979-1981 | 1 | 0 | 1.000 | 3.23 | 11 | 0 | 0 | 0 | 0 | 30.2 | 26 | 11 | 0 | 22 | 15 |
| Thomas O'Donnell | 1971-1971 | 1 | 1 | .500 | 0.89 | 2 | 2 | 1 | 0 | 0 | 20.1 | 12 | 2 | 1 | 5 | 13 |
| Rick O'Keeffe | 1974-1975 | 3 | 1 | .750 | 2.95 | 11 | 7 | 1 | 0 | 0 | 64.0 | 47 | 21 | 2 | 44 | 31 |
| John O'Neil | 1940-1940 | 0 | 0 | .000 | 4.50 | 1 | 0 | 0 | 0 | 0 | 8.0 | 13 | 4 | 1 | 4 | 8 |
| Justin O'Shea | 1972-1972 | 2 | 0 | 1.000 | 5.84 | 9 | 0 | 0 | 0 | 1 | 24.2 | 33 | 16 | 3 | 11 | 11 |
| Len Okrie | 1954-1954 | 0 | 1 | .000 | 4.20 | 1 | 1 | 0 | 0 | 0 | 15.0 | 16 | 7 | 2 | 6 | 9 |
| Jim Ollom | 1963-1963 | 7 | 5 | .583 | 3.51 | 14 | 12 | 4 | 0 | 0 | 82.0 | 74 | 32 | 8 | 46 | 100 |
| Rich Olsen | 1977-1980 | 6 | 2 | .750 | 2.04 | 13 | 9 | 2 | 1 | 0 | 70.2 | 50 | 16 | 3 | 37 | 43 |
| Bruce Olson | 1968-1968 | 8 | 3 | .727 | 1.84 | 14 | 14 | 5 | 1 | 0 | 88.0 | 77 | 18 | 3 | 36 | 61 |
| Mitchell Olson | 1969-1969 | 3 | 2 | .600 | 4.71 | 13 | 4 | 3 | 0 | 2 | 42.0 | 40 | 22 | 5 | 19 | 49 |
| Michael Orlich | 1979-1981 | 3 | 0 | 1.000 | 1.70 | 14 | 1 | 0 | 0 | 0 | 37.0 | 28 | 7 | 2 | 17 | 27 |
| Robert Ormond | 1969-1969 | 5 | 2 | .714 | 4.06 | 9 | 9 | 3 | 0 | 0 | 62.0 | 70 | 28 | 6 | 21 | 58 |
| Alex Orozco | 1979-1979 | 2 | 6 | .250 | 5.70 | 10 | 10 | 2 | 0 | 0 | 60.0 | 60 | 38 | 3 | 37 | 42 |
| Washington Orozco | 1969-1970 | 0 | 0 | .000 | 45.00 | 1 | 0 | 0 | 0 | 1 | 1.0 | 3 | 5 | 1 | 5 | 1 |
| Seth Orr | 1971-1971 | 0 | 1 | .000 | 7.50 | 2 | 1 | 0 | 0 | 0 | 6.0 | 9 | 5 | 0 | 2 | 2 |
| Nelson Ortiz | 1970-1970 | 1 | 0 | 1.000 | 4.50 | 3 | 0 | 0 | 0 | 0 | 8.0 | 11 | 4 | 1 | 6 | 1 |
| Raul Ortiz | 1979-1980 | 15 | 5 | .750 | 2.39 | 27 | 27 | 8 | 3 | 0 | 207.0 | 131 | 55 | 7 | 85 | 175 |
| Steven Osborne | 1974-1978 | 0 | 1 | .000 | 5.56 | 6 | 0 | 0 | 0 | 0 | 11.1 | 12 | 7 | 1 | 8 | 2 |
| Matt Osmanski | 1972-1972 | 2 | 2 | .500 | 6.62 | 15 | 0 | 0 | 0 | 6 | 17.2 | 26 | 13 | 2 | 11 | 6 |
| Frank Ostrow | 1978-1979 | 1 | 0 | 1.000 | 3.18 | 11 | 0 | 0 | 0 | 1 | 11.1 | 10 | 4 | 2 | 15 | 8 |
| Amos Otis | 1965-1965 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 2 | 0 | 0 | 1 | 1 |
| Robert Ott | 1971-1972 | 1 | 2 | .333 | 2.23 | 9 | 8 | 0 | 0 | 0 | 44.1 | 29 | 11 | 3 | 20 | 36 |
| Jim Otten | 1972-1972 | 1 | 1 | .500 | 7.30 | 2 | 2 | 0 | 0 | 0 | 12.1 | 18 | 10 | 1 | 5 | 10 |
| James Owen | 1973-1975 | 20 | 11 | .645 | 3.16 | 35 | 35 | 12 | 3 | 0 | 267.2 | 223 | 94 | 9 | 120 | 153 |
