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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Joel O'Sullivan | 1955-1958 | 1 | 1 | .500 | 5.97 | 13 | 0 | 0 | 0 | 1 | 34.2 | 36 | 23 | 8 | 21 | 23 |
| Aguri Ogata | 1955-1956 | 2 | 0 | 1.000 | 3.66 | 9 | 0 | 0 | 0 | 0 | 39.1 | 31 | 16 | 1 | 20 | 40 |
| Sukesaburo Ono | 1958-1958 | 0 | 0 | .000 | 2.70 | 1 | 1 | 0 | 0 | 0 | 6.2 | 3 | 2 | 2 | 2 | 10 |
| Remo Orlandi | 1954-1956 | 1 | 0 | 1.000 | 14.44 | 6 | 0 | 0 | 0 | 0 | 14.1 | 31 | 23 | 4 | 9 | 3 |
| Cesar Ortiz | 1958-1958 | 2 | 0 | 1.000 | 4.32 | 4 | 0 | 0 | 0 | 0 | 8.1 | 10 | 4 | 2 | 4 | 4 |
| Urzig Osei | 1953-1956 | 5 | 1 | .833 | 3.70 | 17 | 0 | 0 | 0 | 5 | 24.1 | 23 | 10 | 4 | 14 | 22 |
| Dositej Ostrozinska | 1952-1953 | 8 | 2 | .800 | 4.22 | 17 | 17 | 3 | 2 | 0 | 106.2 | 116 | 50 | 10 | 26 | 78 |
| Justyn Ottoboni | 1956-1958 | 0 | 1 | .000 | 23.82 | 7 | 0 | 0 | 0 | 0 | 5.2 | 21 | 15 | 5 | 2 | 4 |
| Nehemiah Owens | 1955-1956 | 8 | 7 | .533 | 6.12 | 18 | 18 | 1 | 1 | 0 | 107.1 | 129 | 73 | 15 | 58 | 71 |
| Nelson Oxlaj | 1956-1958 | 8 | 8 | .500 | 6.48 | 22 | 22 | 0 | 0 | 0 | 133.1 | 187 | 96 | 23 | 52 | 86 |
| Nalle Ozinga | 1957-1957 | 0 | 0 | .000 | 0.00 | 3 | 0 | 0 | 0 | 0 | 4.2 | 0 | 0 | 0 | 1 | 4 |
