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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jacquez, Ramon | RP | Hanoi Dragon Warriors | 41 | 10/14/2008 | Maracaibo | VEN | Right | Left | 6' 3" | 200 lbs | $1,800,000 |
| Jamieson, Jeremy | RP | Portland Beavers | 18 | 01/05/2032 | Sydney | AUS | Right | Left | 5' 11" | 165 lbs | - |
| Jaquez, Andres | SS | Yellowstone Super Volcano | 24 | 09/21/2025 | Turners Falls | USA | Left | Right | 6' 1" | 185 lbs | $5,400,000 |
| Jaquez, Jorge | SP | Portland Beavers | 18 | 03/09/2032 | Cabimas | VEN | Right | Right | 6' 3" | 185 lbs | - |
| Jarovtsev, Evgeny | C | Kyiv Cossacks | 17 | 10/22/2032 | Alchevsk | UKR | Right | Right | 6' 2" | 195 lbs | - |
| Jeffers, Aaron | SS | Portland Beavers | 28 | 05/01/2022 | Corpus Christi | USA | Right | Right | 6' 2" | 195 lbs | $1,180,000 |
| Jeffreys, Teddy | SP | Yellowstone Super Volcano | 19 | 07/14/2030 | Melbourne | AUS | Left | Left | 6' 7" | 200 lbs | - |
| Jeffries, Jacob | CF | Sudbury Blueberry Bulldogs | 27 | 06/16/2022 | Ashland | USA | Left | Left | 6' 2" | 210 lbs | $11,010,000 |
| Jennings, Scott | 3B | Hanoi Dragon Warriors | 22 | 12/25/2027 | Palatine | USA | Switch | Right | 6' 2" | 185 lbs | $545,000 |
| Jerez, Miguel | C | Buffalo Buffalo | 16 | 11/09/2033 | Valencia | VEN | Right | Right | 6' 4" | 195 lbs | - |
| Jimenez, Alex | C | Yellowstone Super Volcano | 18 | 06/15/2031 | Las Guaranas | DOM | Right | Right | 5' 10" | 170 lbs | - |
| Jimenez, Carlos | 1B | Waikiki Wayfinders | 33 | 02/12/2017 | San Carlos del Zulia | VEN | Left | Right | 5' 11" | 200 lbs | $45,600,000 |
| Jimenez, Dave | 1B | Waikiki Wayfinders | 17 | 11/26/2032 | Santiago | DOM | Left | Left | 6' 5" | 200 lbs | - |
| Jimenez, Davis | SP | Yellowstone Super Volcano | 18 | 10/15/2031 | Turmero | VEN | Right | Right | 6' 2" | 185 lbs | - |
| Jimenez, Jose | SP | Los Angeles Kings | 19 | 10/24/2030 | Santo Domingo | DOM | Right | Right | 6' 2" | 185 lbs | - |
| Johnson, Jeff | LF | Waikiki Wayfinders | 25 | 11/10/2024 | Georgetown | USA | Switch | Right | 6' 2" | 205 lbs | $545,000 |
| Johnson, Joe | RP | Waikiki Wayfinders | 24 | 12/23/2025 | New York | USA | Left | Left | 6' 1" | 195 lbs | $545,000 |
| Jones, John | 2B | Waikiki Wayfinders | 24 | 11/21/2025 | Little Cottonwood Creek Valley | USA | Right | Right | 5' 11" | 170 lbs | $545,000 |
| Jones, Kyle | RF | Free Agent | 28 | 07/27/2021 | Laguna Niguel | USA | Right | Right | 6' 5" | 205 lbs | - |
| Jordan, John | 1B | Free Agent | 30 | 11/02/2019 | Anaconda | USA | Right | Right | 6' 8" | 230 lbs | - |
| Joya, Kendry | SP | Arizona Desert Storm | 18 | 12/15/2031 | Santo Domingo | DOM | Right | Left | 6' 2" | 185 lbs | - |
| Juarez, Lorenzo | SS | Osaka Takoyaki | 17 | 10/02/2032 | Puebla | MEX | Left | Right | 6' 2" | 175 lbs | - |
