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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackson, Ryan | 1B | Astoria Argonauts | 28 | 05/28/2029 | Los Angeles | USA | Right | Right | 6' 2" | 200 lbs | - |
| Jacobs, Dan | RP | Reno Raiders | 24 | 05/21/2033 | Whistler | CAN | Right | Right | 6' 6" | 200 lbs | - |
| Jacobs, Jeff | RP | Free Agent | 28 | 06/13/2029 | Antioch | USA | Left | Left | 6' 6" | 200 lbs | - |
| Jacobs, Keith | SP | Calgary Kodiaks | 28 | 02/16/2029 | Trinity | USA | Left | Left | 6' 1" | 195 lbs | - |
| Jahnke, Josh | RP | Astoria Argonauts | 30 | 02/19/2027 | Riverside | USA | Right | Right | 6' 0" | 195 lbs | $600,000 |
| Jaja, Frawsen | 3B | Tallahassee Captains | 26 | 09/23/2031 | Dundee | RSA | Right | Right | 5' 10" | 180 lbs | - |
| James, Dante | SS | Madison Muskies | 25 | 04/29/2032 | Salem | USA | Left | Right | 6' 4" | 200 lbs | - |
| Jaramillo, Juan | LF | Albuquerque Cacti | 24 | 06/03/2033 | Antilla | CUB | Left | Left | 6' 0" | 205 lbs | - |
| Jean, Eitel | SP | Free Agent | 32 | 09/17/2025 | Köniz | SUI | Left | Left | 6' 4" | 200 lbs | - |
| Jensen, Jason | SP | Free Agent | 31 | 03/01/2026 | Haysville | USA | Left | Left | 6' 4" | 200 lbs | - |
| Jimenez, Dave | CF | Astoria Argonauts | 33 | 02/16/2024 | Santo Domingo | DOM | Switch | Right | 5' 10" | 185 lbs | - |
| Jimenez, David | C | Free Agent | 25 | 01/13/2032 | San Luis | CUB | Right | Right | 6' 1" | 205 lbs | - |
| Jimenez, Israel | 3B | Baton Rouge Outlaws | 25 | 12/04/2031 | Jaruco | CUB | Right | Right | 6' 4" | 200 lbs | $600,000 |
| Johannes, Jim | C | Antioch Coal Miners | 32 | 07/04/2025 | Georgetown | USA | Switch | Right | 6' 0" | 215 lbs | - |
| Johnson, Harley | RP | Astoria Argonauts | 33 | 03/03/2024 | Kingston | JAM | Right | Right | 6' 3" | 200 lbs | - |
| Johnson, Jacob | RP | Free Agent | 28 | 05/21/2029 | Davenport | USA | Left | Left | 6' 0" | 200 lbs | - |
| Johnson, Joey | SP | Free Agent | 30 | 12/18/2026 | Bronx | USA | Left | Left | 6' 6" | 200 lbs | - |
| Johnson, Larry | SP | Anchorage Moose | 32 | 08/20/2025 | Bowling Green | USA | Left | Left | 6' 3" | 195 lbs | - |
| Jones, Brandon | SP | Free Agent | 26 | 04/25/2031 | Wichita | USA | Right | Right | 6' 4" | 200 lbs | - |
| Jones, Cori | SS | Calgary Kodiaks | 23 | 07/13/2034 | Gilmore | USA | Right | Right | 6' 0" | 190 lbs | - |
| Jones, Ernie | RP | Astoria Argonauts | 21 | 02/02/2036 | Cincinnati | USA | Left | Right | 6' 4" | 195 lbs | $600,000 |
| Jones, Harry | LF | Peoria Caterpillars | 30 | 05/06/2027 | San Antonio | USA | Right | Right | 6' 2" | 195 lbs | - |
| Jones, Mike | SP | Free Agent | 29 | 04/13/2028 | Medford | USA | Left | Left | 6' 2" | 200 lbs | - |
| Jones, Quincy | 1B | Fairfield Flash | 32 | 04/17/2025 | Kingston | JAM | Right | Left | 6' 1" | 200 lbs | - |
| Josey, Glen | C | Antioch Coal Miners | 26 | 05/25/2031 | Saguenay | CAN | Right | Right | 6' 1" | 200 lbs | $600,000 |
| Juarez, Dave | SS | Free Agent | 30 | 07/12/2027 | Holguín | CUB | Right | Right | 6' 2" | 190 lbs | - |
| Juarez, Jon | 1B | Free Agent | 29 | 10/30/2028 | Minatitlan | MEX | Left | Right | 6' 1" | 200 lbs | - |
| Juhan, Mark | SS | Joplin Fireballs | 29 | 06/05/2028 | Toronto | CAN | Right | Right | 6' 4" | 200 lbs | - |
| Junker, Brent | SP | Free Agent | 31 | 12/05/2025 | El Paso | USA | Right | Right | 6' 2" | 205 lbs | - |
| Jurado, Ramon | SS | Free Agent | 28 | 08/21/2029 | San Juan | PUR | Right | Right | 6' 5" | 195 lbs | - |
