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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jacoby, Axel | RP | Tempe Apollos | 27 | 06/30/2015 | Toowoomba | AUS | Right | Right | 6' 4" | 200 lbs | $560,000 |
| James, Melvin | LF | Florida Farstriders | 28 | 07/25/2014 | Leonardo | USA | Right | Right | 6' 4" | 200 lbs | $2,310,000 |
| Janz, Sascha | RP | Free Agent | 18 | 06/19/2024 | Wolfsburg | GER | Left | Left | 6' 6" | 200 lbs | - |
| Jaques, Renato | SP | Neo-Tokyo Akira | 17 | 11/19/2024 | João Pessoa | BRA | Switch | Right | 6' 1" | 175 lbs | - |
| Jaramillo, Juan | SP | Palm Springs Codgers | 30 | 07/06/2012 | Masaya | NCA | Right | Right | 6' 6" | 200 lbs | $8,000,000 |
| Jaramillo, Júlio | RF | New Jersey Hitmen | 36 | 02/08/2006 | Telica | NCA | Switch | Right | 6' 3" | 205 lbs | $18,000,000 |
| Jarrett, Taylor | RP | New Jersey Hitmen | 24 | 10/10/2018 | Harpenden | ENG | Right | Right | 6' 9" | 205 lbs | $560,000 |
| Jean, Guy | SP | Okinawa Shisa | 18 | 12/10/2023 | Le Lamentin | MTQ | Left | Left | 6' 4" | 195 lbs | - |
| Jenkins, Aaron | RF | Free Agent | 31 | 11/04/2010 | Bloomington | USA | Left | Left | 6' 3" | 200 lbs | - |
| Jensen, Glenn | SP | Amsterdam Lions | 17 | 06/07/2025 | Trindade | STP | Right | Right | 6' 7" | 200 lbs | - |
| Jensen, Thomas | LF | Free Agent | 22 | 09/13/2020 | Provo | USA | Left | Right | 6' 4" | 190 lbs | - |
| Jia, Decheng | SS | New Orleans Trendsetters | 32 | 08/25/2010 | Shulin | TPE | Left | Right | 6' 1" | 185 lbs | $1,700,000 |
| Jiao, Luo-shan | 2B | Manchester Maulers | 18 | 11/02/2023 | Huangshi | CHN | Right | Right | 6' 2" | 185 lbs | - |
| Jiao, Yao-pang | SP | Shin Seiki Evas | 19 | 09/21/2023 | Yungho | TPE | Left | Right | 6' 1" | 180 lbs | - |
| Jiménez, Ismael | SP | Crystal Lake Sandgnats | 17 | 03/12/2025 | Constanza | DOM | Left | Left | 6' 5" | 190 lbs | - |
| Jiménez, Luis | 2B | London Underground | 17 | 02/19/2025 | Pocora | CRC | Right | Right | 6' 1" | 170 lbs | - |
| Jiménez, Manuel | 2B | Shin Seiki Evas | 31 | 03/31/2011 | Teabo | MEX | Right | Right | 6' 3" | 200 lbs | $13,500,000 |
| Jiu, Jing-quo | RP | London Underground | 27 | 05/04/2015 | Taiyuan | CHN | Switch | Right | 6' 5" | 200 lbs | $560,000 |
| Johnson, Bill | 3B | Reno Zephyrs | 28 | 07/18/2014 | Rancho Cucamonga | USA | Switch | Right | 6' 3" | 200 lbs | $6,000,000 |
| Johnson, Craig | 3B | Havana Leones | 22 | 03/07/2020 | San Leandro | USA | Right | Right | 5' 9" | 155 lbs | $560,000 |
| Johnson, Denis | RF | Crystal Lake Sandgnats | 31 | 04/23/2011 | Brodhead | USA | Left | Left | 6' 2" | 205 lbs | $12,000,000 |
| Johnston, Britt | LF | Free Agent | 23 | 09/26/2019 | Denver | USA | Right | Right | 6' 4" | 200 lbs | - |
| Joje, José | SP | Fargo Dinosaurs | 28 | 11/01/2013 | Caracas | VEN | Right | Right | 5' 11" | 190 lbs | $5,400,000 |
| Jones, Bill | 2B | London Underground | 41 | 05/03/2001 | Portage | USA | Right | Right | 6' 1" | 205 lbs | $1,560,000 |
| Jones, Bob | 2B | Free Agent | 25 | 07/17/2017 | Ormond Beach | USA | Right | Right | 6' 0" | 185 lbs | - |
| Jones, Robert | SP | Free Agent | 20 | 01/31/2022 | MacKinney | USA | Right | Right | 6' 4" | 190 lbs | - |
| Jong, Jen-djieh | CF | Bakersfield Bears | 16 | 12/18/2025 | Tainan | TPE | Right | Right | 6' 1" | 170 lbs | - |
| Jordan, Ernie | LF | Kalamazoo Badgers | 23 | 04/29/2019 | Edmonton | CAN | Left | Left | 6' 5" | 200 lbs | $2,120,000 |
| Jouda, Akinori | 1B | Madison Malts | 23 | 06/23/2019 | Sakai | JPN | Right | Right | 6' 4" | 185 lbs | $560,000 |
| Ju, Luo-han | RP | Florida Farstriders | 16 | 07/10/2026 | Fengkou | CHN | Left | Right | 5' 9" | 155 lbs | - |
| Juan, Gu | SP | Fargo Dinosaurs | 16 | 08/25/2026 | Tungshih | TPE | Right | Right | 6' 5" | 185 lbs | - |
| Juan, Jing-quo | RP | Havana Leones | 27 | 11/23/2014 | Changhwa | TPE | Right | Right | 5' 10" | 175 lbs | $1,000,000 |
| Juárez, José | 2B | West Virginia Alleghenies | 19 | 04/07/2023 | Barcelona | VEN | Right | Right | 6' 2" | 185 lbs | - |
| Jáquez, Jesús | SP | Free Agent | 21 | 12/25/2020 | Santa Ana | SLV | Left | Left | 6' 3" | 190 lbs | - |
| Júlio, Carlos | RP | Free Agent | 17 | 01/14/2025 | San Pedro de la Paz | CHI | Right | Right | 6' 2" | 185 lbs | - |
