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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackson, Mike | RP | Free Agent | 21 | 06/04/2018 | Pioneer Village | USA | Left | Left | 6' 2" | 175 lbs | - |
| James, Melvin | LF | Florida Farstriders | 25 | 07/25/2014 | Leonardo | USA | Right | Right | 6' 4" | 195 lbs | $560,000 |
| Jaramillo, Juan | SP | New Jersey Hitmen | 27 | 07/06/2012 | Masaya | NCA | Right | Right | 6' 6" | 200 lbs | $5,900,000 |
| Jaramillo, Júlio | RF | New Jersey Hitmen | 34 | 02/08/2006 | Telica | NCA | Switch | Right | 6' 3" | 205 lbs | $19,000,000 |
| Jaramillo, Ramón | 2B | Free Agent | 16 | 12/06/2023 | Cardenas | CUB | Right | Right | 5' 10" | 165 lbs | - |
| Jenkins, John | RP | New Jersey Hitmen | 32 | 01/07/2008 | Mission Viejo | USA | Right | Right | 6' 3" | 205 lbs | $900,000 |
| Jensen, Thomas | LF | Free Agent | 19 | 09/13/2020 | Provo | USA | Left | Right | 6' 4" | 190 lbs | - |
| Jiao, Yao-pang | SP | Shin Seiki Evas | 16 | 09/21/2023 | Yungho | TPE | Left | Right | 6' 1" | 170 lbs | - |
| Jiménez, Emílio | SP | Palm Springs Codgers | 19 | 07/11/2020 | Acajutla | SLV | Left | Left | 6' 5" | 190 lbs | - |
| Jiménez, José | SP | Florida Farstriders | 17 | 08/16/2022 | Patzicía | GUA | Left | Right | 6' 7" | 200 lbs | - |
| Jiménez, Juan | RF | Toyama Wind Dancers | 19 | 05/19/2020 | Padre Hurtado | CHI | Left | Left | 6' 2" | 195 lbs | - |
| Jiménez, Luis | SP | Kentucky Thoroughbreds | 29 | 09/01/2010 | Downey | USA | Left | Left | 6' 9" | 200 lbs | $3,880,000 |
| Jiménez, Manuel | 2B | Palm Springs Codgers | 29 | 03/31/2011 | Teabo | MEX | Right | Right | 6' 3" | 200 lbs | $13,000,000 |
| Jiménez, Orlando | 1B | Gloucester Fishermen | 25 | 03/09/2015 | Santo Domingo | DOM | Left | Left | 6' 2" | 185 lbs | $560,000 |
| Jiménez, Rafael | RF | Arlington Bureaucrats | 17 | 05/09/2022 | Jaruco | CUB | Left | Left | 6' 4" | 205 lbs | - |
| Johnson, Bill | 3B | New Jersey Hitmen | 25 | 07/18/2014 | Rancho Cucamonga | USA | Switch | Right | 6' 3" | 200 lbs | $560,000 |
| Johnson, Denis | LF | New Jersey Hitmen | 29 | 04/23/2011 | Brodhead | USA | Left | Left | 6' 2" | 205 lbs | $9,000,000 |
| Johnston, Thomas | SS | New Orleans Trendsetters | 28 | 04/06/2012 | Stranraer | SCO | Right | Right | 6' 1" | 195 lbs | $560,000 |
| Joje, José | SP | Fargo Dinosaurs | 26 | 11/01/2013 | Caracas | VEN | Right | Right | 5' 11" | 185 lbs | $2,560,000 |
| Jones, Bill | 2B | London Underground | 38 | 05/03/2001 | Portage | USA | Right | Right | 6' 1" | 200 lbs | $17,000,000 |
| Jordan, Ernie | 1B | Kalamazoo Badgers | 20 | 04/29/2019 | Edmonton | CAN | Left | Left | 6' 5" | 200 lbs | $560,000 |
| Juan, Jing-quo | RP | Havana Leones | 25 | 11/23/2014 | Changhwa | TPE | Right | Right | 5' 10" | 175 lbs | $560,000 |
| Jue, Yue-jiu | SS | Toyama Wind Dancers | 19 | 02/10/2021 | Pingxiang | CHN | Right | Right | 5' 9" | 155 lbs | - |
| Julien, Blaine | RP | Arlington Bureaucrats | 27 | 05/30/2012 | Winnipeg | CAN | Right | Right | 6' 4" | 195 lbs | $2,000,000 |
| Justice, Steve | 1B | Free Agent | 30 | 06/19/2009 | Plymouth | USA | Right | Left | 6' 5" | 215 lbs | - |
| Juárez, Augusto | CF | Free Agent | 23 | 05/12/2016 | Santo Domingo | DOM | Right | Right | 5' 11" | 185 lbs | - |
| Juárez, Javier | RP | Havana Leones | 27 | 07/09/2012 | Tocumen | PAN | Right | Right | 6' 2" | 195 lbs | $1,000,000 |
| Juárez, José | 2B | West Virginia Alleghenies | 17 | 04/07/2023 | Barcelona | VEN | Right | Right | 6' 2" | 185 lbs | - |
| Jáquez, Jesús | SP | Duluth Warriors | 19 | 12/25/2020 | Santa Ana | SLV | Left | Left | 6' 3" | 185 lbs | - |
