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| "O" Pitching Register | |
| Batting Register | Pitching Glossary |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO | PWS |
| William Oakes | 2042-2047 | 2 | 11 | .154 | 7.35 | 48 | 16 | 0 | 0 | 0 | 120.0 | 127 | 98 | 27 | 68 | 112 | 2.0 |
| Alejo Ocampo | 2023-2026 | 21 | 39 | .350 | 4.57 | 122 | 81 | 3 | 1 | 0 | 530.0 | 586 | 269 | 55 | 159 | 298 | 22.9 |
| Donagh O'Dowd | 2037-2047 | 63 | 71 | .470 | 5.23 | 232 | 199 | 2 | 2 | 5 | 1168.0 | 1119 | 679 | 101 | 641 | 969 | 35.7 |
| Alan Ohlson | 2028-2031 | 3 | 1 | .750 | 5.70 | 28 | 0 | 0 | 0 | 1 | 36.3 | 51 | 23 | 2 | 22 | 25 | 2.1 |
| Alex Ojeda | 2031-2038 | 14 | 9 | .609 | 4.95 | 195 | 4 | 0 | 0 | 5 | 218.3 | 238 | 120 | 28 | 88 | 122 | 14.6 |
| John Olerud | 2028-2038 | 48 | 68 | .414 | 5.09 | 420 | 123 | 12 | 5 | 2 | 1148.6 | 1144 | 650 | 172 | 453 | 1114 | 49.2 |
| Roy Oles | 2033-2033 | 0 | 5 | .000 | 7.96 | 24 | 10 | 0 | 0 | 1 | 74.7 | 105 | 66 | 17 | 35 | 35 | 0.0 |
| Steven Olguin | 2035-2035 | 1 | 3 | .250 | 7.52 | 5 | 5 | 0 | 0 | 0 | 26.3 | 44 | 22 | 4 | 10 | 7 | 0.0 |
| Bill Opperman | 2023-2031 | 35 | 36 | .493 | 3.72 | 547 | 0 | 0 | 0 | 95 | 631.3 | 593 | 261 | 101 | 165 | 593 | 61.1 |
| John Orosco | 2023-2024 | 11 | 18 | .379 | 3.67 | 140 | 0 | 0 | 0 | 71 | 157.0 | 115 | 64 | 18 | 45 | 132 | 27.0 |
| Raul Orosco | 2023-2026 | 1 | 0 | 1.000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 0 | 0 | 0 | 1 | 0 | 0.0 |
| Javier Orozco | 2038-2041 | 10 | 12 | .455 | 5.77 | 125 | 18 | 0 | 0 | 8 | 232.3 | 227 | 149 | 29 | 147 | 220 | 4.8 |
| Leon Orozco | 2034-2043 | 83 | 95 | .466 | 4.86 | 294 | 246 | 9 | 4 | 0 | 1556.0 | 1296 | 841 | 315 | 756 | 2051 | 52.1 |
| Alfonso Ortega | 2039-2048 | 42 | 21 | .667 | 4.25 | 517 | 0 | 0 | 0 | 17 | 574.3 | 734 | 271 | 54 | 87 | 244 | 45.2 |
| Urso Ortego | 2032-2038 | 13 | 21 | .382 | 5.64 | 318 | 0 | 0 | 0 | 14 | 290.6 | 375 | 182 | 45 | 94 | 161 | 11.6 |
| Jeffrey Oshiro | 2025-2027 | 22 | 17 | .564 | 4.35 | 60 | 51 | 2 | 1 | 1 | 321.0 | 348 | 155 | 29 | 42 | 186 | 15.4 |
| Franky Otero | 2024-2025 | 3 | 4 | .429 | 5.32 | 57 | 0 | 0 | 0 | 0 | 67.7 | 68 | 40 | 9 | 45 | 32 | 1.3 |
| Raymond Ousley | 2047-2048 | 15 | 8 | .652 | 4.95 | 34 | 34 | 1 | 1 | 0 | 218.0 | 238 | 120 | 32 | 29 | 176 | 11.4 |
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