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| Pitching Registers: A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | |
| "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 |
| Anthony Obrien | 1947-1950 | 17 | 10 | .630 | 4.09 | 204 | 0 | 0 | 0 | 4 | 251.0 | 267 | 114 | 27 | 102 | 120 | 18.2 |
| Jack Obyrne | 1947-1950 | 19 | 19 | .500 | 4.64 | 335 | 0 | 0 | 0 | 13 | 328.0 | 353 | 169 | 23 | 117 | 153 | 23.3 |
| Celso Ocejo | 1947-1950 | 48 | 71 | .403 | 4.63 | 135 | 135 | 31 | 4 | 0 | 952.7 | 1112 | 490 | 93 | 312 | 520 | 43.4 |
| Alberto Oliveira | 1947-1947 | 8 | 10 | .444 | 5.70 | 25 | 25 | 2 | 0 | 0 | 154.7 | 192 | 98 | 14 | 48 | 79 | 4.0 |
| Earle Olivier | 1947-1950 | 67 | 34 | .663 | 3.74 | 144 | 142 | 12 | 4 | 0 | 982.7 | 879 | 408 | 88 | 266 | 815 | 66.4 |
| Leonard Orcutt | 1947-1950 | 42 | 43 | .494 | 4.98 | 114 | 114 | 11 | 1 | 0 | 762.0 | 752 | 422 | 72 | 389 | 639 | 31.5 |
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