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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 | 1952-1955 | 23 | 26 | .469 | 4.71 | 56 | 56 | 21 | 3 | 0 | 437.1 | 502 | 229 | 54 | 138 | 325 |
| Andy O'Quinn | 1952-1952 | 5 | 2 | .714 | 5.19 | 32 | 0 | 0 | 0 | 7 | 52.0 | 58 | 30 | 6 | 20 | 53 |
| Lakew Odoyo | 1953-1955 | 7 | 5 | .583 | 4.08 | 12 | 12 | 9 | 1 | 0 | 99.1 | 113 | 45 | 7 | 27 | 59 |
| Tomohisa Okuhara | 1953-1955 | 7 | 12 | .368 | 3.40 | 40 | 7 | 2 | 0 | 10 | 108.2 | 98 | 41 | 7 | 57 | 99 |
| Takehiko Okuno | 1953-1955 | 21 | 15 | .583 | 4.74 | 51 | 51 | 14 | 6 | 0 | 370.1 | 428 | 195 | 48 | 111 | 268 |
| Urzig Osei | 1955-1955 | 1 | 1 | .500 | 4.60 | 11 | 0 | 0 | 0 | 5 | 15.2 | 18 | 8 | 1 | 9 | 14 |
