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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackman, Sloan | 3B | Free Agent | 20 | 08/03/2024 | Toronto | CAN | Switch | Right | 6' 1" | 190 lbs | - |
| Jackson, Erik | RP | St. Louis Coeur | 24 | 06/08/2020 | Layton | USA | Switch | Right | 6' 2" | 200 lbs | $280,000 |
| Jackson, Henry | SP | Free Agent | 26 | 10/27/2018 | Cranston | USA | Right | Right | 6' 2" | 195 lbs | - |
| Jackson, William | LF | Free Agent | 21 | 05/27/2023 | El Dorado Hills | USA | Switch | Right | 6' 0" | 185 lbs | - |
| James, Kenny | RP | Pittsburgh Kingfishers | 30 | 06/29/2014 | Aurora | USA | Left | Left | 6' 4" | 210 lbs | $1,250,000 |
| Janssen, Job | RP | Greenville 84s | 27 | 08/26/2017 | Montaña Rey | CUR | Right | Right | 6' 2" | 195 lbs | $490,000 |
| Jaraba, Branlyn | CL | Charleston Battery | 30 | 04/11/2014 | Envigado | COL | Right | Right | 6' 4" | 205 lbs | $3,000,000 |
| Jefferson, Paul | RP | Free Agent | 27 | 05/24/2017 | Billings | USA | Right | Right | 6' 3" | 205 lbs | - |
| Jenkins, Ed | RP | Free Agent | 18 | 07/13/2026 | Brooklyn | USA | Right | Right | 6' 4" | 195 lbs | - |
| Jennings, Ken | RP | Free Agent | 24 | 04/29/2020 | Santa Ana | USA | Left | Left | 6' 2" | 195 lbs | - |
| Jensen, Josh | RP | Free Agent | 26 | 02/10/2018 | Taylor | USA | Left | Left | 6' 1" | 190 lbs | - |
| Jensen, Jud | C | Free Agent | 25 | 11/27/2019 | Marinette | USA | Switch | Right | 6' 2" | 205 lbs | - |
| Jiao, Ze-dong | SP | Greenville 84s | 16 | 06/14/2028 | Kaohsiung | TPE | Right | Right | 6' 3" | 185 lbs | - |
| Jiménez, José | SP | Hollywood Shredders | 23 | 06/29/2021 | Santo Domingo | DOM | Right | Right | 6' 7" | 220 lbs | $280,000 |
| Jobse, Ton | SP | Charleston Battery | 36 | 09/07/2008 | Antriol | ANT | Right | Right | 5' 11" | 200 lbs | $9,500,000 |
| Joe, Byron | RP | Seattle Rocketeers | 24 | 09/16/2020 | Vallejo | USA | Right | Right | 6' 4" | 200 lbs | $280,000 |
| Johns, Walter | RP | Free Agent | 28 | 11/25/2016 | Bismarck | USA | Left | Right | 6' 2" | 205 lbs | - |
| Johnson, Chris | RP | Free Agent | 26 | 01/06/2018 | Palm Coast | USA | Left | Left | 6' 2" | 190 lbs | - |
| Johnson, Vince | CF | Free Agent | 20 | 06/23/2024 | Corpus Christi | USA | Right | Right | 6' 2" | 190 lbs | - |
| Johnstone, Bill | C | Free Agent | 26 | 11/02/2018 | San Antonio | USA | Right | Right | 6' 2" | 220 lbs | - |
| Jokinen, Kimmo-Mikka | RP | Seattle Rocketeers | 24 | 01/18/2020 | Babolna | HUN | Right | Right | 6' 1" | 185 lbs | $280,000 |
| Jones, Bill | RP | Free Agent | 26 | 06/02/2018 | Elizabeth | USA | Right | Right | 6' 6" | 220 lbs | - |
| Jones, Clarence | SP | Long Island Lighthouse | 28 | 07/23/2016 | Kansas City | USA | Left | Right | 6' 3" | 215 lbs | $440,000 |
| Jones, Leslie | 3B | Free Agent | 19 | 05/07/2025 | Kendale Lakes | USA | Right | Right | 5' 10" | 175 lbs | - |
| Jones, Ron | SP | Free Agent | 23 | 04/11/2021 | Plano | USA | Right | Right | 6' 3" | 190 lbs | - |
| Jones, Sean | SP | Northern Virginia Rainbow Mermaids | 23 | 03/14/2021 | Little Rock | USA | Right | Right | 6' 6" | 205 lbs | $280,000 |
| Jost, Richard | 3B | Long Island Lighthouse | 38 | 10/14/2006 | Saint-Hyacinthe | CAN | Right | Right | 6' 0" | 190 lbs | $6,000,000 |
| Juárez, Luis | RP | Free Agent | 26 | 05/01/2018 | San Lorenzo | PUR | Right | Right | 6' 6" | 205 lbs | - |
| Jude, Ronald | CF | Free Agent | 21 | 07/19/2023 | Modesto | USA | Right | Right | 6' 1" | 175 lbs | - |
| Juderías, Mariano | RF | Charleston Battery | 25 | 08/14/2019 | Santiago de Cuba | CUB | Right | Right | 6' 1" | 180 lbs | $5,665,000 |
| Judkins, Damien | CF | Cleveland Browns | 18 | 08/19/2026 | San Ignacio | BLZ | Right | Right | 6' 0" | 170 lbs | - |
