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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Aguri Ogata | 1957-1957 | 0 | 1 | .000 | 5.40 | 6 | 2 | 0 | 0 | 0 | 23.1 | 26 | 14 | 4 | 15 | 20 |
| Adelbert Olinger | 1952-1954 | 14 | 13 | .519 | 3.41 | 52 | 22 | 12 | 1 | 5 | 222.0 | 240 | 84 | 19 | 74 | 180 |
| Perry Olthof | 1957-1957 | 3 | 3 | .500 | 4.10 | 7 | 7 | 0 | 0 | 0 | 48.1 | 45 | 22 | 5 | 25 | 38 |
| Remo Orlandi | 1957-1958 | 5 | 7 | .417 | 4.05 | 17 | 17 | 0 | 0 | 0 | 93.1 | 84 | 42 | 6 | 69 | 84 |
| Cesar Ortiz | 1958-1958 | 0 | 0 | .000 | 0.00 | 2 | 0 | 0 | 0 | 0 | 3.2 | 1 | 0 | 0 | 1 | 2 |
| Urzig Osei | 1952-1956 | 6 | 3 | .667 | 1.25 | 43 | 0 | 0 | 0 | 10 | 57.2 | 32 | 8 | 4 | 13 | 57 |
| Jeigif Ovsepyan | 1952-1954 | 5 | 5 | .500 | 3.65 | 29 | 13 | 2 | 0 | 0 | 140.2 | 134 | 57 | 17 | 49 | 116 |
| Nehemiah Owens | 1957-1957 | 4 | 1 | .800 | 4.96 | 8 | 8 | 0 | 0 | 0 | 49.0 | 42 | 27 | 7 | 28 | 45 |
| Nalle Ozinga | 1957-1957 | 1 | 0 | 1.000 | 2.70 | 1 | 0 | 0 | 0 | 0 | 3.1 | 3 | 1 | 0 | 3 | 2 |
