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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Zach O'Flaherty | 1955-1955 | 5 | 6 | .455 | 3.83 | 11 | 11 | 2 | 0 | 0 | 80.0 | 76 | 34 | 7 | 32 | 66 |
| Andy O'Quinn | 1953-1953 | 4 | 2 | .667 | 2.16 | 29 | 0 | 0 | 0 | 11 | 41.2 | 25 | 10 | 5 | 12 | 42 |
| Lakew Odoyo | 1953-1957 | 17 | 16 | .515 | 4.17 | 42 | 42 | 17 | 1 | 0 | 326.0 | 354 | 151 | 23 | 127 | 227 |
| Aguri Ogata | 1958-1958 | 0 | 0 | .000 | 1.93 | 1 | 0 | 0 | 0 | 0 | 4.2 | 4 | 1 | 0 | 5 | 3 |
| Tomohisa Okuhara | 1952-1953 | 12 | 12 | .500 | 3.85 | 53 | 7 | 0 | 0 | 16 | 126.1 | 121 | 54 | 13 | 63 | 119 |
| Takehiko Okuno | 1952-1959 | 2 | 0 | 1.000 | 4.53 | 13 | 2 | 1 | 1 | 1 | 51.2 | 57 | 26 | 1 | 26 | 45 |
| Adelbert Olinger | 1958-1958 | 4 | 5 | .444 | 6.14 | 11 | 11 | 0 | 0 | 0 | 63.0 | 85 | 43 | 10 | 25 | 37 |
| Jeigif Ovsepyan | 1956-1959 | 7 | 2 | .778 | 5.85 | 61 | 0 | 0 | 0 | 1 | 157.0 | 193 | 102 | 20 | 72 | 101 |
