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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jacuinde, José | C | Charlotte Knights | 25 | 01/07/2029 | Maracaibo | VEN | Right | Right | 6' 4" | 200 lbs | - |
| Janiszewski, Steve | SP | Chicago Dogs | 22 | 11/28/2031 | Lincoln | USA | Left | Left | 6' 4" | 200 lbs | $455,000 |
| Jaramillo, Héctor | LF | Manchester Marauders | 19 | 11/26/2034 | Panama | PAN | Right | Right | 6' 2" | 185 lbs | - |
| Jasperson, Dave | RP | Austin Bats | 34 | 04/22/2019 | Elgin | USA | Left | Left | 6' 4" | 200 lbs | $1,000,000 |
| Jasso, Héctor | SP | California Dreamers | 17 | 11/26/2036 | Santo Domingo | DOM | Switch | Right | 6' 4" | 190 lbs | - |
| Jasso, Juan | CL | Free Agent | 19 | 02/07/2035 | Guarenas | VEN | Left | Right | 6' 4" | 180 lbs | - |
| Jennings, Randy | SP | Mahoning Valley Scrappers | 26 | 06/27/2027 | Salem | USA | Right | Right | 6' 8" | 215 lbs | $455,000 |
| Jiménez, César | SS | California Dreamers | 19 | 02/18/2035 | Caracas | VEN | Switch | Right | 6' 3" | 185 lbs | - |
| Johnson, Claude | SP | Charlotte Knights | 31 | 02/05/2023 | Logansport | USA | Right | Right | 6' 3" | 200 lbs | $800,000 |
| Johnson, Johnny | SP | Austin Bats | 27 | 12/06/2026 | Cincinnati | USA | Switch | Right | 6' 11" | 200 lbs | $19,200,000 |
| Johnson, Leroy | SS | Nashville Outlaws | 33 | 12/16/2020 | Cape Coral | USA | Left | Right | 6' 2" | 200 lbs | $32,000,000 |
| Jouda, Kazuomi | SP | Free Agent | 32 | 11/14/2021 | Neyagawa | JPN | Left | Left | 5' 10" | 200 lbs | - |
| Juárez, José | SP | Golden State Admirals | 35 | 02/22/2019 | Moca | DOM | Right | Right | 6' 5" | 200 lbs | - |
