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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackson, Joe | 1B | Montreal Mammoths | 23 | 09/08/2028 | Sparta | USA | Left | Left | 6' 8" | 200 lbs | $760,000 |
| Jaime, Felipe | RP | Philadelphia Fury | 24 | 03/17/2028 | Masaya | NCA | Left | Left | 6' 4" | 200 lbs | $760,000 |
| Jarry, Patrick | RP | San Diego Luchadors | 26 | 08/28/2025 | Port-au-Prince | HAI | Right | Right | 6' 7" | 200 lbs | $760,000 |
| Jaso, Daniel | RP | Phoenix Firebirds | 27 | 04/18/2025 | Chihuahua | MEX | Left | Left | 6' 4" | 200 lbs | $1,300,000 |
| Jefferson, Porter | 2B | Atlanta Peaches | 26 | 12/01/2025 | Mississauga | CAN | Right | Right | 6' 0" | 195 lbs | $4,848,000 |
| Jimenez, Mario | RP | Philadelphia Fury | 26 | 07/03/2025 | Tijuana | MEX | Right | Right | 6' 2" | 195 lbs | $4,752,000 |
| Jimenez, Miguel | RP | Houston Rangers | 30 | 04/14/2022 | Chihuahua | MEX | Right | Right | 6' 0" | 190 lbs | $7,000,000 |
| Jimenez, Oscar | SS | Toronto Robbers | 26 | 12/02/2025 | Mazatlan | MEX | Right | Right | 6' 4" | 195 lbs | $13,000,000 |
| Johnson, Jordan | 2B | Mexico City Marauders | 24 | 12/24/2027 | Selma | USA | Right | Right | 6' 0" | 190 lbs | $760,000 |
| Johnson, Steve | C | San Diego Luchadors | 24 | 10/23/2027 | Rochester | USA | Right | Right | 6' 1" | 200 lbs | $4,120,000 |
| Jones, Gary | 1B | Boston Kings | 29 | 12/16/2022 | Santa Ana | USA | Left | Right | 6' 3" | 205 lbs | $4,000,000 |
| Jones, Vince | LF | Toronto Robbers | 23 | 07/17/2028 | Bellair-Meadowbrook Terrace | USA | Left | Left | 6' 4" | 200 lbs | $760,000 |
| Jourdan, Jason | SP | Atlanta Peaches | 25 | 06/06/2027 | Hagerstown | USA | Switch | Right | 5' 10" | 185 lbs | $760,000 |
| Juarez, Omar | SP | Free Agent | 30 | 07/28/2021 | Evarts | USA | Right | Right | 6' 6" | 200 lbs | - |
