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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackman, Sloan | 3B | Free Agent | 22 | 08/03/2024 | Toronto | CAN | Switch | Right | 6' 1" | 200 lbs | - |
| James, Kenny | RP | Pittsburgh Kingfishers | 32 | 06/29/2014 | Aurora | USA | Left | Left | 6' 4" | 200 lbs | $1,340,000 |
| Janero, Marcos | CF | Northern Virginia Rainbow Mermaids | 24 | 08/15/2022 | Quepos | CRC | Right | Right | 6' 4" | 195 lbs | $7,000,000 |
| Janssen, Job | RP | Greenville 84s | 29 | 08/26/2017 | Montaña Rey | CUR | Right | Right | 6' 2" | 195 lbs | $2,400,000 |
| Jenkins, Brenton | SP | St. Louis Coeur | 27 | 06/17/2019 | Plainfield | USA | Right | Right | 6' 6" | 215 lbs | $530,000 |
| Jennings, Ken | RP | Free Agent | 26 | 04/29/2020 | Santa Ana | USA | Left | Left | 6' 2" | 200 lbs | - |
| Jensen, Josh | RP | Free Agent | 28 | 02/10/2018 | Taylor | USA | Left | Left | 6' 1" | 195 lbs | - |
| Jepleting, Annaber | SS | San Mateo Dirty Reds | 18 | 07/16/2028 | Cape Town | RSA | Right | Right | 6' 1" | 165 lbs | - |
| Joe, Byron | SP | Seattle Rocketeers | 26 | 09/16/2020 | Vallejo | USA | Right | Right | 6' 4" | 200 lbs | $490,000 |
| Johnstone, Bill | C | Free Agent | 28 | 11/02/2018 | San Antonio | USA | Right | Right | 6' 2" | 215 lbs | - |
| Jones, Clarence | SP | Boston Patriots | 30 | 07/23/2016 | Kansas City | USA | Left | Right | 6' 3" | 210 lbs | $1,200,000 |
| Jones, Domingo | RP | San Mateo Dirty Reds | 25 | 04/28/2021 | Martinez | USA | Left | Right | 6' 2" | 195 lbs | $280,000 |
| Jones, Johnny | C | Athletic Club KC | 29 | 07/12/2017 | Glenn Dale | USA | Right | Right | 5' 10" | 190 lbs | $3,400,000 |
| Jones, Leslie | 3B | Free Agent | 21 | 05/07/2025 | Kendale Lakes | USA | Right | Right | 5' 10" | 175 lbs | - |
| Jones, Sean | RP | Northern Virginia Rainbow Mermaids | 25 | 03/14/2021 | Little Rock | USA | Right | Right | 6' 6" | 210 lbs | $470,000 |
| Juárez, Luis | RP | Free Agent | 28 | 05/01/2018 | San Lorenzo | PUR | Right | Right | 6' 6" | 200 lbs | - |
