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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 |
|---|---|---|---|---|---|---|---|---|---|
| Kai Jacks | 1952-1952 | 1.000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Angelo Jacopino | 1952-1953 | .297 | 9 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Yuri Janssen | 1953-1956 | .318 | 7 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Rafael Jasso | 1956-1956 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Hervé Jean | 1955-1957 | .326 | 2 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Anders Jensen | 1952-1955 | .000 | 0 | 0 | 15 | 10 | 0 | 5.15 | 152 |
| Sung-min Jeon | 1954-1954 | .000 | 0 | 0 | 0 | 1 | 0 | 8.32 | 37 |
| Marshall Jessop | 1955-1957 | .000 | 0 | 0 | 3 | 3 | 0 | 5.27 | 48 |
| Jimmy Jewett | 1952-1953 | .333 | 2 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Stevan Jigovic | 1956-1957 | .000 | 0 | 0 | 3 | 1 | 0 | 3.58 | 25 |
| Alfredo Jimenez | 1953-1953 | .467 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Norm Johnson | 1954-1954 | .000 | 0 | 0 | 2 | 3 | 0 | 4.62 | 27 |
| Steve Johnson | 1956-1957 | .339 | 1 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| James Johnston | 1957-1957 | .456 | 3 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Sean Jones | 1957-1957 | .000 | 0 | 0 | 2 | 1 | 2 | 8.18 | 17 |
| Zier Jonkers | 1954-1955 | .000 | 0 | 0 | 10 | 7 | 0 | 5.24 | 101 |
| Logan Joseph | 1957-1957 | .292 | 3 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Zivota Jovic | 1952-1952 | .000 | 0 | 0 | 0 | 0 | 0 | 30.00 | 2 |
| Zenel Julia | 1954-1955 | .345 | 4 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Jin-hwan Jung | 1954-1957 | .263 | 9 | 54 | 0 | 0 | 0 | 0.00 | 0 |
