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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 |
|---|---|---|---|---|---|---|---|---|---|
| Tashiro Obata | 1946-1947 | .083 | 0 | 3 | 5 | 6 | 9 | 3.43 | 59 |
| Masikazu Ogata | 1938-1938 | .143 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Takao Ogawa | 1938-1942 | .173 | 0 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Souta Ohashi | 1946-1947 | .183 | 0 | 11 | 17 | 13 | 0 | 2.89 | 72 |
| Takaomi Ohashi | 1938-1941 | .000 | 0 | 0 | 7 | 9 | 13 | 3.42 | 63 |
| Narihide Oishi | 1938-1947 | .263 | 9 | 107 | 0 | 0 | 0 | 0.00 | 0 |
| Baku Oka | 1946-1947 | .156 | 0 | 16 | 13 | 17 | 1 | 3.58 | 62 |
| Kinya Okamoto | 1938-1940 | .264 | 3 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Hajato Okamura | 1938-1940 | .202 | 3 | 61 | 0 | 0 | 0 | 0.00 | 0 |
| Gombei Okazaki | 1947-1947 | .238 | 0 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Kiyohiro Okazaki | 1947-1947 | .100 | 0 | 0 | 12 | 6 | 2 | 1.94 | 52 |
| Itsuro Ono | 1938-1947 | .219 | 5 | 207 | 0 | 0 | 0 | 0.00 | 0 |
| Masanori Onodera | 1938-1947 | .146 | 1 | 36 | 86 | 82 | 0 | 2.68 | 714 |
| Kenji Osaki | 1938-1944 | .139 | 0 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Hidesuke Oshima | 1947-1947 | .360 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Tsugio Oshima | 1938-1939 | .221 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Tokuzo Osugi | 1946-1947 | .206 | 0 | 12 | 33 | 10 | 0 | 1.73 | 141 |
| Munenao Ota | 1938-1941 | .167 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Tsuneyo Ota | 1947-1947 | .333 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Hiroya Oyama | 1946-1947 | .184 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Hisaaki Oyama | 1940-1940 | .250 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Yasukazu Ozaki | 1947-1947 | .321 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
