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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 |
|---|---|---|---|---|---|---|---|---|---|
| Pat O'Donnell | 1956-1958 | .355 | 6 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Joel O'Sullivan | 1955-1958 | .000 | 0 | 0 | 1 | 1 | 1 | 5.97 | 23 |
| Hurem Obrenovic | 1958-1958 | .236 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Aguri Ogata | 1955-1956 | .000 | 0 | 0 | 2 | 0 | 0 | 3.66 | 40 |
| 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 |
| Ben Olinghouse | 1957-1957 | .376 | 4 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Tommy Olivas | 1958-1958 | .306 | 5 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Ruprecht Oliver | 1953-1957 | .228 | 2 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Tristan Olson | 1954-1955 | .208 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Sukesaburo Ono | 1958-1958 | .000 | 0 | 0 | 0 | 0 | 0 | 2.70 | 10 |
| Mario Orellana | 1953-1954 | .336 | 11 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Danny Orengo | 1957-1958 | .305 | 2 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Nour Orji | 1954-1958 | .265 | 9 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Remo Orlandi | 1954-1956 | .000 | 0 | 0 | 1 | 0 | 0 | 14.44 | 3 |
| Cesar Ortiz | 1958-1958 | .000 | 0 | 0 | 2 | 0 | 0 | 4.32 | 4 |
| Ricardo Ortiz | 1956-1956 | .185 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Urzig Osei | 1953-1956 | .000 | 0 | 0 | 5 | 1 | 5 | 3.70 | 22 |
| Dositej Ostrozinska | 1952-1953 | .000 | 0 | 0 | 8 | 2 | 0 | 4.22 | 78 |
| Justyn Ottoboni | 1956-1958 | .000 | 0 | 0 | 0 | 1 | 0 | 23.82 | 4 |
| Nehemiah Owens | 1955-1956 | .000 | 0 | 0 | 8 | 7 | 0 | 6.12 | 71 |
| Nelson Oxlaj | 1956-1958 | .000 | 0 | 0 | 8 | 8 | 0 | 6.48 | 86 |
| Nalle Ozinga | 1957-1957 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 4 |
