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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Paul O'Donnell | 1953-1953 | 6 | 4 | .600 | 5.42 | 17 | 17 | 0 | 0 | 0 | 101.1 | 136 | 61 | 15 | 37 | 50 |
| Zach O'Flaherty | 1952-1958 | 45 | 41 | .523 | 4.40 | 98 | 98 | 47 | 5 | 0 | 785.1 | 881 | 384 | 84 | 226 | 626 |
| Andy O'Quinn | 1952-1952 | 5 | 2 | .714 | 5.19 | 32 | 0 | 0 | 0 | 7 | 52.0 | 58 | 30 | 6 | 20 | 53 |
| Lakew Odoyo | 1953-1957 | 13 | 10 | .565 | 3.84 | 23 | 23 | 15 | 4 | 0 | 189.2 | 220 | 81 | 12 | 52 | 127 |
| Tomohisa Okuhara | 1953-1955 | 7 | 12 | .368 | 3.40 | 40 | 7 | 2 | 0 | 10 | 108.2 | 98 | 41 | 7 | 57 | 99 |
| Takehiko Okuno | 1953-1958 | 32 | 22 | .593 | 4.65 | 86 | 68 | 17 | 7 | 3 | 510.2 | 593 | 264 | 60 | 149 | 378 |
| Adelbert Olinger | 1956-1959 | 4 | 9 | .308 | 6.65 | 35 | 15 | 1 | 0 | 1 | 134.0 | 178 | 99 | 25 | 53 | 86 |
| Remo Orlandi | 1958-1958 | 0 | 0 | .000 | 7.50 | 2 | 0 | 0 | 0 | 0 | 6.0 | 8 | 5 | 0 | 5 | 5 |
| Urzig Osei | 1955-1955 | 1 | 1 | .500 | 4.60 | 11 | 0 | 0 | 0 | 5 | 15.2 | 18 | 8 | 1 | 9 | 14 |
| Nelson Oxlaj | 1958-1958 | 1 | 0 | 1.000 | 4.00 | 1 | 1 | 1 | 0 | 0 | 9.0 | 7 | 4 | 2 | 4 | 2 |
