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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 | 1953-1953 | .000 | 0 | 0 | 6 | 4 | 0 | 5.42 | 50 |
| Zach O'Flaherty | 1952-1957 | .000 | 0 | 0 | 32 | 31 | 0 | 4.45 | 425 |
| Andy O'Quinn | 1952-1952 | .000 | 0 | 0 | 5 | 2 | 7 | 5.19 | 53 |
| Theo Oberacker | 1952-1957 | .299 | 8 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Niko Obradovic | 1954-1957 | .272 | 5 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Aleksandar Obrenovic | 1954-1955 | .255 | 5 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Yasuo Oda | 1952-1952 | .273 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Lakew Odoyo | 1953-1957 | .000 | 0 | 0 | 13 | 10 | 0 | 3.84 | 127 |
| Dimitrije Ognenovic | 1956-1956 | .234 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Tomohisa Okuhara | 1953-1955 | .000 | 0 | 0 | 7 | 12 | 10 | 3.40 | 99 |
| Takehiko Okuno | 1953-1957 | .000 | 0 | 0 | 29 | 22 | 0 | 4.62 | 357 |
| Adelbert Olinger | 1956-1956 | .000 | 0 | 0 | 3 | 4 | 1 | 7.06 | 58 |
| Steve Olsen | 1952-1955 | .296 | 24 | 105 | 0 | 0 | 0 | 0.00 | 0 |
| Jared Olson | 1953-1956 | .246 | 19 | 64 | 0 | 0 | 0 | 0.00 | 0 |
| Yoshitomo Ono | 1954-1955 | .270 | 11 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Micah Orlandi | 1952-1956 | .321 | 6 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Tyler Orndorff | 1953-1957 | .229 | 4 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Marcos Ortiz | 1954-1955 | .310 | 7 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Urzig Osei | 1955-1955 | .000 | 0 | 0 | 1 | 1 | 5 | 4.60 | 14 |
| Franky Otten | 1954-1957 | .322 | 7 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Dylan Owbridge | 1952-1953 | .312 | 10 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Motohiro Oyama | 1956-1957 | .241 | 4 | 21 | 0 | 0 | 0 | 0.00 | 0 |
