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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jacobs, Christos | 3B | Yellowstone Super Volcano | 18 | 10/15/2034 | Newcastle | AUS | Right | Right | 6' 1" | 185 lbs | - |
| James, Patrick | SP | St. Louis Archies | 16 | 11/02/2036 | Noord | ARU | Right | Right | 6' 4" | 190 lbs | - |
| Jamrog, Micah | RP | Arizona Scorpions | 26 | 07/10/2026 | Sherman | USA | Left | Left | 6' 2" | 190 lbs | $950,000 |
| Jaquez, Andres | SS | Yellowstone Super Volcano | 27 | 09/21/2025 | Turners Falls | USA | Left | Right | 6' 1" | 195 lbs | $18,600,000 |
| Jeffers, Aaron | SS | Wilmington Blue Rocks | 31 | 05/01/2022 | Corpus Christi | USA | Right | Right | 6' 2" | 195 lbs | $1,700,000 |
| Jeffries, Jacob | CF | Arizona Scorpions | 31 | 06/16/2022 | Ashland | USA | Left | Left | 6' 2" | 210 lbs | $17,200,000 |
| Jennings, Scott | SS | Hanoi Dragon Warriors | 25 | 12/25/2027 | Palatine | USA | Switch | Right | 6' 2" | 190 lbs | $3,600,000 |
| Jennings, Tim | 3B | Brooklyn Knights | 26 | 05/10/2027 | Boston | USA | Left | Right | 6' 5" | 220 lbs | $545,000 |
| Jimenez, Alex | C | Havana Sugar Kings | 19 | 12/07/2033 | Maracaibo | VEN | Right | Right | 6' 0" | 185 lbs | - |
| Jimenez, Angel | C | Waikiki Wayfinders | 25 | 04/01/2028 | Managua | NCA | Left | Right | 6' 5" | 210 lbs | $545,000 |
| Jimenez, Antonio | RP | Havana Sugar Kings | 27 | 03/16/2026 | Galesburg | USA | Left | Left | 6' 5" | 210 lbs | $545,000 |
| Jimenez, Carlos | 1B | Waikiki Wayfinders | 36 | 02/12/2017 | San Carlos del Zulia | VEN | Left | Right | 5' 11" | 205 lbs | $42,400,000 |
| Jimenez, Jesus | 2B | Free Agent | 18 | 08/01/2034 | Managua | NCA | Right | Right | 6' 2" | 180 lbs | - |
| Jimenez, Manny | C | St. Louis Archies | 17 | 11/23/2035 | Havana | CUB | Right | Right | 6' 2" | 195 lbs | - |
| Jin, Jae-bok | RP | Free Agent | 24 | 03/06/2029 | Ulsan | KOR | Right | Left | 6' 1" | 200 lbs | - |
| Johnson, Jeff | LF | Waikiki Wayfinders | 28 | 11/10/2024 | Georgetown | USA | Switch | Right | 6' 2" | 200 lbs | $3,500,000 |
| Johnson, Joe | SP | Waikiki Wayfinders | 27 | 12/23/2025 | New York | USA | Left | Left | 6' 1" | 200 lbs | $1,950,000 |
| Johnson, Josh | CL | Detroit Pizzas | 29 | 05/04/2024 | Morristown | USA | Left | Left | 6' 0" | 200 lbs | $15,000,000 |
| Johnson, Shawn | SP | Sudbury Blueberry Bulldogs | 26 | 09/29/2026 | Coral Springs | USA | Switch | Right | 6' 5" | 215 lbs | $545,000 |
| Juarez, Edwin | C | Free Agent | 18 | 11/10/2034 | Bajos de Haina | DOM | Switch | Right | 6' 4" | 200 lbs | - |
| Juarez, Jon | SP | Arizona Scorpions | 16 | 04/14/2037 | Santo Domingo | DOM | Right | Right | 6' 1" | 175 lbs | - |
| Judson, A.J. | RP | Dublin Porters | 27 | 05/02/2026 | Greensboro | USA | Right | Right | 6' 6" | 190 lbs | $545,000 |
| Julio, Lílian | SP | Detroit Pizzas | 17 | 03/20/2036 | Maracaibo | VEN | Right | Right | 6' 1" | 175 lbs | - |
