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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackson, Alan | SP | Grand Forks Caterpillars | 23 | 10/18/2026 | New York | USA | Right | Right | 6' 4" | 205 lbs | - |
| Jackson, Hamilton | LF | Put-In-Bay Commodores | 23 | 06/23/2026 | Glendale | USA | Left | Right | 6' 6" | 210 lbs | - |
| Jackson, Oliver | C | Washington Generals | 23 | 08/25/2026 | Hobart | USA | Switch | Right | 6' 3" | 215 lbs | - |
| Jaffre, Jean-Paul | SP | Washington Generals | 24 | 07/10/2025 | Calgary | CAN | Left | Left | 6' 1" | 195 lbs | - |
| James, Jacob | 3B | Monroeville Yinzers | 23 | 09/27/2026 | Compton | USA | Right | Right | 6' 1" | 200 lbs | - |
| James, Jason | RF | Put-In-Bay Commodores | 23 | 09/23/2026 | Carlisle | USA | Left | Left | 6' 0" | 190 lbs | - |
| Jogov, Fabiyan | C | Washington Generals | 21 | 08/04/2028 | Vilnius | LTU | Right | Right | 6' 4" | 195 lbs | - |
| Johnson, Hugh | C | Niagara Falls Expos | 23 | 10/16/2026 | Lewiston | USA | Right | Right | 6' 4" | 210 lbs | - |
| Johnson, Jim | C | Monroeville Yinzers | 24 | 10/16/2025 | Davenport | USA | Switch | Right | 6' 3" | 210 lbs | - |
| Johnson, Ronald | SP | Kingston Mangos | 21 | 06/03/2028 | Virden | USA | Right | Right | 6' 4" | 195 lbs | - |
| Jokinen, Jami | RP | Niagara Falls Expos | 22 | 12/07/2027 | Gyal | HUN | Right | Right | 6' 3" | 190 lbs | - |
| Jones, Morgan | SP | Monroeville Yinzers | 23 | 09/21/2026 | Vista | USA | Switch | Right | 6' 2" | 200 lbs | - |
| Jones, Randy | RF | Syracuse Storm | 24 | 05/09/2025 | Independence | USA | Right | Right | 6' 1" | 200 lbs | - |
| Jordan, Oliver | 3B | Belleville Bulls | 22 | 01/28/2027 | Medina | USA | Right | Right | 6' 2" | 185 lbs | - |
| Juárez, Juan | 3B | Syracuse Storm | 20 | 03/03/2029 | Santiago | DOM | Switch | Right | 6' 2" | 190 lbs | - |
