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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 |
|---|---|---|---|---|---|---|---|---|---|
| Graham Jackson | 2039-2042 | .242 | 7 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Adrian Jacobs | 2039-2039 | .250 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Jacobs | 2039-2039 | .000 | 0 | 0 | 2 | 2 | 0 | 1.07 | 16 |
| Axel Jacoby | 2034-2037 | .000 | 0 | 0 | 16 | 15 | 0 | 2.75 | 247 |
| Mark Jago | 2042-2042 | .000 | 0 | 0 | 1 | 0 | 0 | 1.20 | 5 |
| Matt James | 2041-2042 | .200 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Silvian Janzen | 2039-2042 | .255 | 27 | 72 | 0 | 0 | 0 | 0.00 | 0 |
| César Jaramillo | 2042-2042 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Oscar Jarrold | 2033-2035 | .000 | 0 | 0 | 4 | 3 | 3 | 3.27 | 93 |
| Joey Jarvis | 2041-2042 | .200 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Aaron Jenkins | 2030-2032 | .273 | 20 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Joshua Jenkins | 2041-2042 | .000 | 0 | 0 | 6 | 1 | 0 | 2.36 | 26 |
| Halmar Jens | 2038-2041 | .230 | 16 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Liang-hsi Ji | 2042-2042 | .000 | 0 | 0 | 0 | 0 | 0 | 4.15 | 1 |
| Wei-fang Jianbua | 2039-2039 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 1 |
| Vicente Jiménez | 2038-2041 | .184 | 7 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Ángel Jiménez | 2035-2036 | .209 | 7 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Zai-shuo Jin | 2038-2041 | .000 | 0 | 0 | 9 | 6 | 11 | 2.55 | 46 |
| Dean Johannson | 2040-2040 | .000 | 0 | 0 | 0 | 4 | 0 | 6.98 | 17 |
| Stanley Johnson | 2042-2042 | .000 | 0 | 0 | 2 | 0 | 0 | 4.57 | 12 |
| Thomas Johnston | 2030-2033 | .310 | 19 | 98 | 0 | 0 | 0 | 0.00 | 0 |
| Kyle Johnstone | 2029-2032 | .000 | 0 | 0 | 15 | 9 | 0 | 2.67 | 213 |
| Mark Jollymour | 2041-2042 | .000 | 0 | 0 | 3 | 2 | 17 | 1.57 | 44 |
| Clay Jones | 2042-2042 | .071 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Mario Jorisse | 2041-2042 | .281 | 21 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Ryutaro Jouda | 2036-2039 | .000 | 0 | 0 | 10 | 12 | 0 | 4.93 | 72 |
| Sakutaro Jouda | 2037-2040 | .230 | 2 | 10 | 5 | 14 | 0 | 3.77 | 45 |
| Yosai Jouda | 2041-2042 | .000 | 0 | 0 | 3 | 1 | 0 | 3.88 | 11 |
| Sugimoto Jouon | 2038-2040 | .000 | 0 | 0 | 5 | 3 | 1 | 3.30 | 37 |
| Tokutomi Jouon | 2041-2042 | .302 | 20 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Curtis Joyce | 2030-2033 | .192 | 5 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Blaine Julien | 2030-2033 | .000 | 0 | 0 | 5 | 4 | 17 | 2.81 | 90 |
| Germán Jáquez | 2021-2024 | .326 | 39 | 143 | 0 | 0 | 0 | 0.00 | 0 |
