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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackson, Joe | 1B | Free Agent | 26 | 09/08/2028 | Sparta | USA | Left | Left | 6' 8" | 200 lbs | - |
| Jackson, Josh | CF | Mexico City Marauders | 21 | 05/25/2033 | North Attleborough | USA | Right | Right | 6' 2" | 185 lbs | $760,000 |
| Jacobo, Hector | 1B | Hollywood Hitters | 22 | 02/10/2033 | Juarez | MEX | Left | Left | 6' 4" | 200 lbs | $760,000 |
| Jacobs, Davon | C | Detroit Vipers | 23 | 03/28/2032 | Vaughan | CAN | Right | Right | 6' 0" | 195 lbs | $760,000 |
| Jaime, David | C | Free Agent | 30 | 03/25/2025 | Toluca | MEX | Switch | Right | 6' 1" | 195 lbs | - |
| Jaime, Felipe | RP | Philadelphia Fury | 27 | 03/17/2028 | Masaya | NCA | Left | Left | 6' 4" | 200 lbs | $1,700,000 |
| James, Alex | 2B | Chicago Hawks | 24 | 10/27/2030 | San Antonio | USA | Right | Right | 6' 1" | 190 lbs | $760,000 |
| James, Jamal | SP | Montreal Mammoths | 25 | 12/30/2029 | Evanston | USA | Left | Left | 6' 1" | 180 lbs | $760,000 |
| Jansen, Randy | RP | Denver Queens | 22 | 09/04/2032 | Saguenay | CAN | Switch | Right | 6' 0" | 180 lbs | $760,000 |
| Jara, Mario | RP | Free Agent | 34 | 04/20/2021 | Mexico City | MEX | Left | Left | 6' 4" | 200 lbs | - |
| Jarry, Patrick | RP | Dallas Jets | 29 | 08/28/2025 | Port-au-Prince | HAI | Right | Right | 6' 7" | 200 lbs | $1,700,000 |
| Jauregui, Mario | SP | Free Agent | 31 | 08/23/2023 | Sonzacate | SLV | Right | Right | 6' 4" | 200 lbs | - |
| Jefferson, Porter | 2B | Free Agent | 29 | 12/01/2025 | Mississauga | CAN | Right | Right | 6' 0" | 200 lbs | - |
| Jimenez, Esteban | RP | Free Agent | 36 | 07/20/2018 | Holguín | CUB | Left | Left | 6' 2" | 200 lbs | - |
| Jimenez, Ismael | RP | Phoenix Firebirds | 32 | 07/29/2022 | Santa Catarina Pinula | GUA | Right | Right | 6' 2" | 195 lbs | - |
| Jimenez, Jon | SP | Free Agent | 30 | 04/01/2025 | Chihuahua | MEX | Right | Right | 6' 2" | 185 lbs | - |
| Jimenez, Juan | 3B | Miami Makos | 24 | 02/02/2031 | San Salvador | SLV | Right | Right | 6' 4" | 215 lbs | $760,000 |
| Jimenez, Mario | RP | Free Agent | 29 | 07/03/2025 | Tijuana | MEX | Right | Right | 6' 2" | 200 lbs | - |
| Jimenez, Miguel | SP | Free Agent | 33 | 04/14/2022 | Chihuahua | MEX | Right | Right | 6' 0" | 190 lbs | - |
| Jimenez, Oscar | SS | Toronto Robbers | 29 | 12/02/2025 | Mazatlan | MEX | Right | Right | 6' 4" | 195 lbs | $13,000,000 |
| Joaquin, Alejandro | 1B | Toronto Robbers | 31 | 05/15/2024 | Mexico City | MEX | Right | Right | 6' 5" | 200 lbs | - |
| Johnson, Danny | 1B | Boston Kings | 24 | 01/13/2031 | Omaha | USA | Left | Right | 6' 2" | 205 lbs | $760,000 |
| Johnson, Kelvin | SP | Free Agent | 32 | 08/15/2022 | Hot Springs | USA | Right | Right | 6' 2" | 200 lbs | - |
| Johnson, Steve | C | San Francisco Pioneers | 27 | 10/23/2027 | Rochester | USA | Right | Right | 6' 1" | 200 lbs | $10,600,000 |
| Jolly, Pat | RP | New York Empire | 24 | 03/05/2031 | Orangetown | USA | Right | Right | 6' 4" | 200 lbs | $760,000 |
| Joly, Chris | 2B | Jacksonville Jackals | 32 | 11/05/2022 | Longueuil | CAN | Right | Right | 6' 0" | 200 lbs | $760,000 |
| Jones, Carlton | SP | Oklahoma City Twisters | 21 | 11/01/2033 | Kingston | JAM | Right | Right | 6' 3" | 180 lbs | $760,000 |
| Jones, Matt | 3B | Free Agent | 27 | 06/15/2027 | Colonial Park | USA | Right | Right | 6' 3" | 200 lbs | - |
| Jones, Ryan | SP | Free Agent | 24 | 07/11/2030 | Philadelphia | USA | Right | Right | 6' 2" | 195 lbs | - |
| Jordan, Chris | RP | Free Agent | 31 | 07/30/2023 | Wichita | USA | Right | Right | 5' 10" | 180 lbs | - |
| Jost, Keith | C | Houston Rangers | 23 | 09/02/2031 | Tilsonburg | CAN | Right | Right | 6' 2" | 200 lbs | $760,000 |
| Judson, Tom | 2B | Orlando Orange | 24 | 02/12/2031 | Gainesville | USA | Right | Right | 6' 0" | 185 lbs | $760,000 |
| Jurin, Jon | 3B | Boston Kings | 26 | 03/10/2029 | Longmont | USA | Switch | Right | 6' 2" | 185 lbs | $760,000 |
| Justmann, Mike | 3B | Hollywood Hitters | 29 | 08/26/2025 | Oklahoma City | USA | Right | Right | 6' 1" | 195 lbs | $1,634,000 |
