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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 | 1956-1956 | .000 | 0 | 0 | 0 | 2 | 0 | 11.45 | 9 |
| Mike O'Shea | 1956-1959 | .473 | 3 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Niko Obradovic | 1956-1959 | .190 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Mashiro Oda | 1956-1959 | .189 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Yury Ojiganov | 1956-1956 | .312 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Illarion Okerblom | 1956-1959 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Tomohisa Okuhara | 1956-1959 | .000 | 0 | 0 | 1 | 0 | 0 | 8.80 | 12 |
| Takehiko Okuno | 1956-1956 | .000 | 0 | 0 | 0 | 1 | 0 | 9.00 | 2 |
| Mario Orozco | 1956-1959 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jeigif Ovsepyan | 1956-1959 | .000 | 0 | 0 | 0 | 3 | 0 | 7.36 | 6 |
| Hang-ki Ow | 1956-1959 | .000 | 0 | 0 | 1 | 1 | 0 | 3.74 | 14 |
