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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 |
|---|---|---|---|---|---|---|---|---|---|
| Freddi Jacobson | 1952-1954 | .000 | 0 | 0 | 17 | 20 | 0 | 3.86 | 167 |
| Robert Jakl | 1952-1959 | .000 | 0 | 0 | 24 | 31 | 0 | 3.26 | 306 |
| Dong-hyun Jang | 1956-1956 | .500 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Hyung-kwang Jang | 1953-1959 | .297 | 15 | 86 | 0 | 0 | 0 | 0.00 | 0 |
| Hubert Janostak | 1954-1955 | .223 | 6 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Helge Jatzyk | 1958-1959 | .161 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Kevin Jeffcoat | 1954-1957 | .265 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Young-min Jeon | 1952-1956 | .285 | 37 | 165 | 0 | 0 | 0 | 0.00 | 0 |
| Radek Jezek | 1957-1958 | .000 | 0 | 0 | 3 | 6 | 3 | 2.86 | 31 |
| Ke-yue Jian | 1957-1958 | .000 | 0 | 0 | 3 | 2 | 0 | 2.28 | 26 |
| Wing-chiu Jiang | 1957-1957 | .000 | 0 | 0 | 0 | 0 | 0 | 3.38 | 2 |
| Andrusha Jolkevsky | 1952-1959 | .000 | 0 | 0 | 56 | 61 | 0 | 3.08 | 568 |
| Cheh Joo | 1952-1955 | .000 | 0 | 0 | 0 | 0 | 0 | 5.88 | 9 |
| Maxim Jukhtanov | 1952-1957 | .000 | 0 | 0 | 3 | 7 | 0 | 4.90 | 63 |
| Jong-hun Jung | 1952-1955 | .264 | 32 | 114 | 0 | 0 | 0 | 0.00 | 0 |
