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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jaramillo, Jose | RP | Philadelphia Fury | 28 | 05/14/2021 | Comonfort | MEX | Left | Left | 5' 11" | 185 lbs | $2,600,000 |
| Jaso, Daniel | RP | Phoenix Firebirds | 25 | 04/18/2025 | Chihuahua | MEX | Left | Left | 6' 4" | 200 lbs | $760,000 |
| Jefferson, Porter | 3B | Atlanta Peaches | 24 | 12/01/2025 | Mississauga | CAN | Right | Right | 6' 0" | 185 lbs | $760,000 |
| Jimenez, Ismael | RP | Phoenix Firebirds | 27 | 07/29/2022 | Santa Catarina Pinula | GUA | Right | Right | 6' 2" | 200 lbs | $760,000 |
| Jimenez, Mario | CL | Philadelphia Fury | 24 | 07/03/2025 | Tijuana | MEX | Right | Right | 6' 2" | 185 lbs | $760,000 |
| Jimenez, Miguel | SP | Houston Rangers | 28 | 04/14/2022 | Chihuahua | MEX | Right | Right | 6' 0" | 180 lbs | $6,000,000 |
| Jimenez, Oscar | SS | Toronto Robbers | 24 | 12/02/2025 | Mazatlan | MEX | Right | Right | 6' 4" | 190 lbs | $13,000,000 |
| Johnson, Steve | C | San Diego Luchadors | 22 | 10/23/2027 | Rochester | USA | Right | Right | 6' 1" | 195 lbs | $760,000 |
| Johnstone, Davy | RP | Free Agent | 28 | 07/15/2021 | Montreal | CAN | Right | Right | 6' 3" | 205 lbs | - |
| Jones, Gary | 1B | Boston Kings | 27 | 12/16/2022 | Santa Ana | USA | Left | Right | 6' 3" | 200 lbs | $3,200,000 |
| Jones, Joe | SP | Free Agent | 34 | 07/20/2015 | Port Charlotte | USA | Right | Right | 6' 2" | 195 lbs | - |
| Jones, Matt | 3B | Detroit Vipers | 22 | 06/15/2027 | Colonial Park | USA | Right | Right | 6' 3" | 200 lbs | $760,000 |
| Jones, Matt | C | Free Agent | 29 | 01/22/2021 | Columbia City | USA | Right | Right | 6' 2" | 195 lbs | - |
| Juarez, Omar | SP | Denver Queens | 28 | 07/28/2021 | Evarts | USA | Right | Right | 6' 6" | 200 lbs | $2,200,000 |
| Justmann, Mike | 3B | Chicago Hawks | 24 | 08/26/2025 | Oklahoma City | USA | Right | Right | 6' 1" | 190 lbs | $760,000 |
