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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 |
|---|---|---|---|---|---|---|---|---|---|
| Zach O'Flaherty | 1955-1955 | .000 | 0 | 0 | 5 | 6 | 0 | 3.83 | 66 |
| Andy O'Quinn | 1953-1953 | .000 | 0 | 0 | 4 | 2 | 11 | 2.16 | 42 |
| Niko Obradovic | 1955-1955 | .233 | 1 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Aleksandar Obrenovic | 1954-1955 | .246 | 4 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Lakew Odoyo | 1953-1954 | .000 | 0 | 0 | 9 | 7 | 0 | 4.09 | 101 |
| Tomohisa Okuhara | 1952-1953 | .000 | 0 | 0 | 12 | 12 | 16 | 3.85 | 119 |
| Takehiko Okuno | 1952-1952 | .000 | 0 | 0 | 1 | 0 | 1 | 5.48 | 36 |
| Jared Olson | 1955-1955 | .241 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Yoshitomo Ono | 1953-1953 | .179 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Micah Orlandi | 1955-1955 | .263 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Tyler Orndorff | 1955-1955 | .333 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Marcos Ortiz | 1953-1953 | .302 | 7 | 31 | 0 | 0 | 0 | 0.00 | 0 |
