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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 |
|---|---|---|---|---|---|---|---|---|---|
| Ethan Jackson | 2102-2102 | .224 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Jobst Jacobson | 2102-2107 | .000 | 0 | 0 | 18 | 18 | 1 | 4.08 | 183 |
| Volodya Jahnenko | 2106-2107 | .272 | 20 | 93 | 0 | 0 | 0 | 0.00 | 0 |
| Ulrik Jakkelsen | 2104-2105 | .194 | 7 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Fredrik Jakobsen | 2101-2106 | .200 | 35 | 128 | 0 | 0 | 0 | 0.00 | 0 |
| Telmo Jalles | 2102-2105 | .000 | 0 | 0 | 19 | 11 | 2 | 3.06 | 189 |
| Grigory Janikian | 2106-2107 | .254 | 25 | 83 | 0 | 0 | 0 | 0.00 | 0 |
| Ludek Janousek | 2105-2105 | .200 | 5 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Luka Janssen | 2102-2107 | .000 | 0 | 0 | 58 | 49 | 7 | 3.08 | 634 |
| Jan Jaspersen | 2107-2107 | .000 | 0 | 0 | 0 | 1 | 1 | 3.96 | 28 |
| Édouard Jeannin | 2101-2103 | .000 | 0 | 0 | 16 | 13 | 8 | 4.24 | 163 |
| Connor Jenkins | 2102-2107 | .000 | 0 | 0 | 10 | 6 | 2 | 3.22 | 200 |
| Arend Jensen | 2107-2107 | .000 | 0 | 0 | 0 | 0 | 0 | 27.00 | 0 |
| Sivert Jensen | 2106-2107 | .000 | 0 | 0 | 10 | 7 | 0 | 3.11 | 81 |
| Ulrik Johansson | 2104-2104 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 3 |
| Jacob Jones | 2101-2102 | .306 | 51 | 207 | 0 | 0 | 0 | 0.00 | 0 |
| Stewart Jones | 2103-2104 | .000 | 0 | 0 | 1 | 2 | 1 | 5.16 | 42 |
| Bennie Jongste | 2101-2102 | .000 | 0 | 0 | 13 | 9 | 1 | 4.30 | 69 |
| Sander Jonkers | 2107-2107 | .227 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Anders Jorgensen | 2101-2105 | .200 | 92 | 284 | 0 | 0 | 0 | 0.00 | 0 |
| Gérard Jourdan | 2106-2107 | .240 | 12 | 64 | 0 | 0 | 0 | 0.00 | 0 |
| Ivan Jovanovic | 2106-2107 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Marko Jovic | 2101-2107 | .000 | 0 | 0 | 25 | 20 | 111 | 2.35 | 351 |
| Tapio Jutila | 2101-2103 | .000 | 0 | 0 | 4 | 2 | 0 | 4.70 | 55 |
