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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 |
|---|---|---|---|---|---|---|---|---|---|
| Werner Jackman | 2032-2032 | .000 | 0 | 0 | 3 | 4 | 0 | 4.70 | 49 |
| Jason Jackson | 2030-2030 | .000 | 0 | 0 | 0 | 2 | 0 | 6.08 | 37 |
| Shane Jacobs | 2031-2031 | .000 | 0 | 0 | 2 | 5 | 0 | 3.31 | 75 |
| Jules Jacquemin | 2026-2026 | .000 | 0 | 0 | 3 | 3 | 0 | 4.41 | 52 |
| Jim Jameson | 2032-2032 | .288 | 7 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Bruce Janes | 2032-2032 | .111 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Trevor Jansen | 2029-2029 | .256 | 6 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Alain Jeannin | 2028-2028 | .000 | 0 | 0 | 2 | 4 | 0 | 6.71 | 54 |
| Ai-de Jen | 2018-2018 | .000 | 0 | 0 | 0 | 2 | 2 | 4.84 | 36 |
| Lloyd Jenkins | 2029-2029 | .000 | 0 | 0 | 3 | 4 | 2 | 7.85 | 54 |
| Sidney Jenkins | 2031-2031 | .253 | 5 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Stephen Jerram | 2021-2021 | .245 | 11 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| A.J. Jesso | 2030-2030 | .000 | 0 | 0 | 3 | 3 | 0 | 5.88 | 49 |
| Randy Jesso | 2032-2032 | .289 | 8 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Lawrence Jewers | 2016-2016 | .339 | 18 | 66 | 0 | 0 | 0 | 0.00 | 0 |
| José Jiménez | 2021-2021 | .358 | 5 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Rafael Jiménez | 2022-2022 | .000 | 0 | 0 | 1 | 2 | 7 | 4.03 | 35 |
| Hai-dong Joe | 2016-2016 | .366 | 21 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Kennan Johannson | 2017-2017 | .000 | 0 | 0 | 5 | 2 | 0 | 3.27 | 68 |
| Ronnie Johnson | 2019-2019 | .354 | 10 | 64 | 0 | 0 | 0 | 0.00 | 0 |
| John Johnston | 2027-2027 | .303 | 2 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Mark Johnston | 2028-2028 | .248 | 8 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Roy Johnston | 2031-2031 | .000 | 0 | 0 | 3 | 2 | 2 | 5.44 | 52 |
| Jordan Johnstone | 2012-2012 | .000 | 0 | 0 | 6 | 3 | 0 | 2.91 | 81 |
| Frank Joly | 2031-2031 | .000 | 0 | 0 | 2 | 5 | 0 | 6.16 | 62 |
| Gilles Joly | 2028-2028 | .000 | 0 | 0 | 2 | 1 | 0 | 6.67 | 76 |
| Kevin Joly | 2026-2026 | .000 | 0 | 0 | 1 | 4 | 0 | 8.67 | 40 |
| Oscar Jones | 2019-2019 | .335 | 13 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Dean Jordan | 2031-2031 | .000 | 0 | 0 | 3 | 4 | 0 | 8.31 | 35 |
| Paul Joseph | 2032-2032 | .197 | 2 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Nicolas Joubert | 2028-2028 | .000 | 0 | 0 | 3 | 1 | 0 | 4.44 | 62 |
| Dimitri Jourdan | 2025-2025 | .000 | 0 | 0 | 3 | 1 | 0 | 4.40 | 24 |
| George Joy | 2028-2028 | .288 | 3 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Lonnie Joy | 2032-2032 | .125 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Rich Judson | 2031-2031 | .204 | 5 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Alex Julien | 2032-2032 | .000 | 0 | 0 | 2 | 1 | 0 | 4.29 | 46 |
| Norm Julien | 2032-2032 | .231 | 2 | 3 | 0 | 0 | 0 | 0.00 | 0 |
