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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 | 1972-1974 | 3 | 2 | .600 | 5.85 | 39 | 0 | 0 | 0 | 0 | 52.1 | 50 | 34 | 8 | 27 | 48 |
| Kenneth O'Brien | 1976-1976 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 4.1 | 2 | 0 | 0 | 1 | 1 |
| Kenneth O'Brien | 1975-1975 | 1 | 2 | .333 | 5.76 | 24 | 0 | 0 | 0 | 2 | 25.0 | 30 | 16 | 2 | 21 | 25 |
| Jack W O'Connor | 1977-1980 | 7 | 10 | .412 | 4.27 | 51 | 12 | 3 | 3 | 1 | 149.2 | 117 | 71 | 13 | 103 | 145 |
| Thomas O'Donnell | 1976-1976 | 0 | 5 | .000 | 8.87 | 10 | 10 | 0 | 0 | 0 | 47.2 | 57 | 47 | 5 | 51 | 25 |
| Jerry O'Neill | 1979-1980 | 3 | 3 | .500 | 2.55 | 38 | 0 | 0 | 0 | 16 | 42.1 | 18 | 12 | 3 | 26 | 63 |
| Theodore O'Neill | 1979-1979 | 4 | 1 | .800 | 5.68 | 13 | 6 | 1 | 0 | 1 | 52.1 | 58 | 33 | 5 | 35 | 41 |
| Evan O'Rourke | 1972-1978 | 11 | 11 | .500 | 5.01 | 36 | 32 | 1 | 0 | 0 | 181.1 | 178 | 101 | 21 | 106 | 150 |
| Denny O'Toole | 1970-1970 | 0 | 0 | .000 | 2.61 | 7 | 0 | 0 | 0 | 0 | 10.1 | 13 | 3 | 1 | 8 | 11 |
| Benjamin Ochoa | 1971-1975 | 28 | 7 | .800 | 2.96 | 48 | 41 | 16 | 2 | 0 | 312.2 | 246 | 103 | 24 | 102 | 283 |
| Raymie Odermott | 1980-1980 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 0 | 0 | 0 | 1 | 1 |
| John Ogden | 1978-1978 | 0 | 4 | .000 | 4.08 | 27 | 0 | 0 | 0 | 0 | 28.2 | 24 | 13 | 1 | 29 | 22 |
| Ron Oglesby | 1973-1974 | 5 | 3 | .625 | 3.34 | 17 | 17 | 0 | 0 | 0 | 86.1 | 81 | 32 | 5 | 30 | 74 |
| Bob Ojeda | 1977-1980 | 9 | 16 | .360 | 5.10 | 73 | 19 | 3 | 0 | 14 | 185.1 | 178 | 105 | 15 | 128 | 136 |
| Oswaldo Olivares | 1972-1976 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.0 | 1 | 1 | 0 | 1 | 0 |
| Lew Olsen | 1975-1975 | 5 | 2 | .714 | 3.86 | 13 | 12 | 1 | 0 | 0 | 74.2 | 65 | 32 | 7 | 33 | 68 |
| William Olsen | 1970-1970 | 0 | 0 | .000 | 1.93 | 5 | 0 | 0 | 0 | 5 | 4.2 | 4 | 1 | 0 | 0 | 4 |
| Clinton Olson | 1970-1975 | 2 | 4 | .333 | 4.83 | 78 | 0 | 0 | 0 | 3 | 104.1 | 93 | 56 | 12 | 71 | 77 |
| Dean Olson | 1976-1976 | 1 | 1 | .500 | 6.00 | 2 | 1 | 0 | 0 | 0 | 6.0 | 7 | 4 | 0 | 4 | 7 |
| Mitchell Olson | 1973-1973 | 1 | 3 | .250 | 4.50 | 10 | 0 | 0 | 0 | 0 | 14.0 | 12 | 7 | 3 | 7 | 20 |
| Robert Omo | 1977-1978 | 13 | 9 | .591 | 3.44 | 29 | 29 | 5 | 4 | 0 | 196.1 | 151 | 75 | 11 | 112 | 162 |
| Jesse Orosco | 1978-1979 | 1 | 2 | .333 | 4.43 | 20 | 0 | 0 | 0 | 1 | 20.1 | 18 | 10 | 1 | 11 | 13 |
| Tony Orrego | 1975-1976 | 4 | 8 | .333 | 9.07 | 60 | 0 | 0 | 0 | 1 | 84.1 | 113 | 85 | 14 | 103 | 38 |
| Marcos Ortega | 1972-1975 | 9 | 10 | .474 | 2.95 | 38 | 38 | 1 | 1 | 0 | 204.2 | 169 | 67 | 10 | 74 | 227 |
| Jordan Ortiz | 1977-1979 | 3 | 5 | .375 | 3.29 | 44 | 1 | 0 | 0 | 22 | 54.2 | 42 | 20 | 3 | 37 | 49 |
| Nelson Ortiz | 1971-1971 | 0 | 0 | .000 | 6.75 | 3 | 0 | 0 | 0 | 2 | 5.1 | 3 | 4 | 0 | 3 | 5 |
| Raul Ortiz | 1980-1980 | 0 | 1 | .000 | 2.67 | 10 | 0 | 0 | 0 | 1 | 27.0 | 25 | 8 | 1 | 14 | 28 |
| Jeffrey Orville | 1978-1979 | 1 | 10 | .091 | 4.17 | 20 | 20 | 0 | 0 | 0 | 112.1 | 117 | 52 | 9 | 61 | 61 |
| Ozzie Osborn | 1975-1975 | 1 | 0 | 1.000 | 5.00 | 4 | 0 | 0 | 0 | 0 | 9.0 | 10 | 5 | 0 | 2 | 5 |
| William Osborne | 1974-1974 | 3 | 0 | 1.000 | 7.51 | 30 | 0 | 0 | 0 | 1 | 50.1 | 59 | 42 | 4 | 38 | 30 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| Matt Osmanski | 1972-1972 | 0 | 0 | .000 | 4.26 | 7 | 0 | 0 | 0 | 0 | 12.2 | 12 | 6 | 1 | 10 | 13 |
| Mike Overy | 1972-1976 | 7 | 13 | .350 | 3.80 | 84 | 1 | 0 | 0 | 22 | 106.2 | 74 | 45 | 5 | 83 | 132 |
| Bob Owchinko | 1976-1978 | 1 | 1 | .500 | 4.15 | 8 | 2 | 1 | 0 | 0 | 26.0 | 35 | 12 | 0 | 17 | 13 |
| Tom Owens | 1977-1980 | 11 | 7 | .611 | 3.98 | 24 | 24 | 1 | 1 | 0 | 129.0 | 101 | 57 | 6 | 81 | 122 |
