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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 | 1953-1953 | .355 | 10 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Josh Jacob | 1957-1958 | .000 | 0 | 0 | 5 | 0 | 7 | 2.85 | 42 |
| Jose Jacuinde | 1958-1958 | .254 | 1 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Dwight James | 1958-1958 | .000 | 0 | 0 | 0 | 2 | 0 | 14.00 | 2 |
| Sylvain James | 1952-1952 | .000 | 0 | 0 | 5 | 6 | 0 | 6.50 | 59 |
| Mirko Janda | 1952-1953 | .000 | 0 | 0 | 4 | 8 | 0 | 5.94 | 53 |
| Juan Jaramillo | 1952-1953 | .000 | 0 | 0 | 11 | 9 | 1 | 4.42 | 94 |
| Rafael Jasso | 1956-1957 | .291 | 2 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Alejandro Javier | 1955-1956 | .000 | 0 | 0 | 1 | 1 | 1 | 3.27 | 12 |
| Hervé Jean | 1955-1955 | .336 | 5 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Paul Jean | 1954-1956 | .317 | 9 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Branislav Jeftanovic | 1953-1954 | .000 | 0 | 0 | 4 | 0 | 0 | 5.51 | 47 |
| Sung-min Jeon | 1952-1952 | .000 | 0 | 0 | 2 | 0 | 1 | 0.87 | 15 |
| Stevan Jigovic | 1952-1953 | .000 | 0 | 0 | 1 | 0 | 0 | 9.00 | 2 |
| Alex Jimenez | 1953-1957 | .000 | 0 | 0 | 11 | 10 | 2 | 5.53 | 111 |
| Danny Jimenez | 1953-1953 | .346 | 6 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Willie Jimenez | 1957-1958 | .000 | 0 | 0 | 4 | 1 | 0 | 3.92 | 24 |
| Kevin Johnson | 1952-1952 | .000 | 0 | 0 | 1 | 1 | 0 | 11.25 | 9 |
| Mark Johnson | 1953-1956 | .325 | 14 | 64 | 0 | 0 | 0 | 0.00 | 0 |
| James Johnston | 1953-1954 | .348 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Jared Johnston | 1955-1955 | .241 | 5 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Bruno Jolivet | 1952-1952 | .403 | 16 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Corey Jones | 1956-1957 | .000 | 0 | 0 | 0 | 1 | 1 | 2.35 | 5 |
| Jonathan Jones | 1952-1956 | .323 | 6 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Kaleb Jones | 1952-1954 | .000 | 0 | 0 | 2 | 1 | 5 | 2.31 | 24 |
| Sean Jones | 1953-1955 | .000 | 0 | 0 | 1 | 0 | 4 | 5.87 | 12 |
| Steve Jones | 1958-1958 | .000 | 0 | 0 | 0 | 1 | 0 | 6.75 | 2 |
| Bob Jorgensen | 1953-1953 | .000 | 0 | 0 | 0 | 0 | 0 | 1.50 | 5 |
| Zivota Jovic | 1952-1953 | .344 | 4 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Tory Joy | 1958-1958 | .000 | 0 | 0 | 2 | 3 | 0 | 7.62 | 20 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Kung Jue | 1955-1957 | .000 | 0 | 0 | 0 | 0 | 0 | 4.95 | 10 |
| Matt Julian | 1953-1954 | .345 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Rick Junco | 1955-1955 | 1.000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Eric Jurgens | 1958-1958 | .346 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
