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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
|---|---|---|---|---|---|---|---|---|---|
| Joel O'Sullivan | 1955-1955 | .000 | 0 | 0 | 0 | 0 | 0 | 11.57 | 0 |
| Aguri Ogata | 1955-1955 | .000 | 0 | 0 | 1 | 0 | 0 | 5.75 | 17 |
| Dimitrije Ognenovic | 1952-1954 | .323 | 7 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Velimir Ogrijenovic | 1953-1954 | .224 | 2 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Zivota Ogrijenovic | 1952-1952 | .269 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Ben Oldford | 1953-1954 | .390 | 7 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Ruprecht Oliver | 1953-1955 | .205 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Tristan Olson | 1954-1955 | .208 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Mario Orellana | 1953-1954 | .336 | 11 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Nour Orji | 1954-1955 | .265 | 6 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Remo Orlandi | 1954-1954 | .000 | 0 | 0 | 1 | 0 | 0 | 13.89 | 2 |
| Urzig Osei | 1953-1955 | .000 | 0 | 0 | 4 | 1 | 4 | 3.86 | 16 |
| Dositej Ostrozinska | 1952-1953 | .000 | 0 | 0 | 8 | 2 | 0 | 4.22 | 78 |
| Nehemiah Owens | 1955-1955 | .000 | 0 | 0 | 4 | 4 | 0 | 8.53 | 24 |
