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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 |
|---|---|---|---|---|---|---|---|---|---|
| Reid O'Carroll | 1958-1958 | .140 | 2 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Niko Obradovic | 1952-1953 | .247 | 2 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Aleksandar Obrenovic | 1952-1952 | .222 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Aguri Ogata | 1957-1957 | .200 | 0 | 0 | 0 | 1 | 0 | 5.40 | 20 |
| Dimitrije Ognenovic | 1953-1954 | .311 | 2 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Velimir Ogrijenovic | 1952-1952 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ben Oldford | 1956-1956 | .304 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Adelbert Olinger | 1952-1954 | .210 | 1 | 6 | 14 | 13 | 5 | 3.41 | 180 |
| Ben Olinghouse | 1958-1958 | .229 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Perry Olthof | 1957-1957 | .158 | 0 | 2 | 3 | 3 | 0 | 4.10 | 38 |
| Mario Orellana | 1955-1956 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Nour Orji | 1955-1957 | .179 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Remo Orlandi | 1957-1958 | .219 | 0 | 2 | 5 | 7 | 0 | 4.05 | 84 |
| Giovanny Orsi | 1952-1952 | .214 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Cesar Ortiz | 1958-1958 | .500 | 1 | 1 | 0 | 0 | 0 | 0.00 | 2 |
| Ricardo Ortiz | 1957-1958 | .500 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Urzig Osei | 1952-1956 | .250 | 0 | 0 | 6 | 3 | 10 | 1.25 | 57 |
| Franky Otten | 1952-1952 | .317 | 4 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Jeigif Ovsepyan | 1952-1954 | .089 | 2 | 6 | 5 | 5 | 0 | 3.65 | 116 |
| Nehemiah Owens | 1957-1957 | .300 | 1 | 3 | 4 | 1 | 0 | 4.96 | 45 |
| Motohiro Oyama | 1952-1953 | .260 | 7 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Nalle Ozinga | 1957-1957 | .000 | 0 | 0 | 1 | 0 | 0 | 2.70 | 2 |
