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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 |
|---|---|---|---|---|---|---|---|---|---|
| Paul O'Donnell | 1952-1952 | .000 | 0 | 0 | 9 | 7 | 0 | 4.60 | 76 |
| Theo Oberacker | 1953-1954 | .391 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Niko Obradovic | 1954-1954 | .319 | 3 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Aleksandar Obrenovic | 1952-1953 | .289 | 12 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Lakew Odoyo | 1952-1955 | .000 | 0 | 0 | 14 | 13 | 0 | 3.83 | 121 |
| Aguri Ogata | 1958-1959 | .000 | 0 | 0 | 10 | 4 | 0 | 3.63 | 89 |
| Dimitrije Ognenovic | 1955-1955 | .312 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Velimir Ogrijenovic | 1955-1956 | .159 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Zivota Ogrijenovic | 1953-1953 | .135 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Ben Oldford | 1955-1958 | .285 | 6 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Adelbert Olinger | 1955-1955 | .000 | 0 | 0 | 3 | 5 | 0 | 4.69 | 58 |
| Ben Olinghouse | 1958-1959 | .302 | 2 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Ruprecht Oliver | 1957-1958 | .362 | 9 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Franck Ollivier | 1958-1958 | .200 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Jared Olson | 1952-1952 | .225 | 1 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Milojica Omeragic | 1955-1956 | .000 | 0 | 0 | 3 | 2 | 1 | 5.26 | 31 |
| Yoshitomo Ono | 1952-1952 | .335 | 6 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Borenko Opacic | 1952-1953 | .000 | 0 | 0 | 2 | 1 | 2 | 5.72 | 22 |
| Danny Orengo | 1957-1957 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Nour Orji | 1957-1958 | .231 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Micah Orlandi | 1952-1954 | .291 | 4 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Tyler Orndorff | 1952-1952 | .286 | 3 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Rodger Orozco | 1958-1959 | .294 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Giovanny Orsi | 1953-1954 | .288 | 2 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Ricardo Ortiz | 1958-1959 | .455 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Dositej Ostrozinska | 1954-1954 | .000 | 0 | 0 | 6 | 5 | 0 | 4.60 | 46 |
| Franky Otten | 1952-1953 | .331 | 5 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Jeigif Ovsepyan | 1955-1956 | .000 | 0 | 0 | 7 | 9 | 0 | 3.97 | 59 |
| Nehemiah Owens | 1958-1958 | .000 | 0 | 0 | 4 | 3 | 0 | 6.23 | 51 |
| Motohiro Oyama | 1953-1956 | .273 | 2 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
