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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackson, Jayden | 1B | Free Agent | 18 | 06/25/2027 | Plymouth | USA | Right | Right | 6' 2" | 200 lbs | - |
| Jackson, Jonathan | SP | Montreal Expos | 33 | 04/28/2012 | Reed City | USA | Right | Right | 5' 10" | 195 lbs | $40,000,000 |
| Jackson, Nate | SP | Seattle Mariners | 38 | 07/05/2007 | Cañon City | USA | Left | Right | 6' 8" | 210 lbs | $15,000,000 |
| Jacobs, Jamal | RP | Free Agent | 31 | 11/01/2014 | Sweetwater | USA | Right | Right | 6' 5" | 200 lbs | - |
| James, David | RP | Cincinnati Reds | 24 | 04/05/2021 | Philadelphia | USA | Left | Left | 6' 2" | 200 lbs | $1,478,750 |
| Jank, Jeff | SP | New York Mets | 31 | 01/19/2014 | Pittsburgh | USA | Right | Right | 6' 6" | 200 lbs | $15,000,000 |
| Jansen, Philip | LF | Free Agent | 29 | 03/09/2016 | Meerzorg | SUR | Right | Right | 6' 3" | 200 lbs | - |
| Jaquez, Mike | 2B | Kansas City Royals | 22 | 06/22/2023 | San Francisco de Macorís | DOM | Right | Right | 6' 1" | 190 lbs | $675,000 |
| Jaramillo, Danny | RP | Free Agent | 34 | 03/26/2011 | Dorado | PUR | Left | Right | 6' 4" | 200 lbs | - |
| Jarvis, Ian | C | Free Agent | 31 | 11/09/2014 | Maywood | USA | Left | Right | 5' 10" | 190 lbs | - |
| Jefferies, Danny | LF | Free Agent | 20 | 01/31/2025 | Country Club | USA | Right | Right | 6' 0" | 190 lbs | - |
| Jeleniewski, Brady | SS | Detroit Tigers | 25 | 04/14/2020 | St. Louis | USA | Right | Right | 5' 10" | 185 lbs | $675,000 |
| Jen, Chi-young | RP | Free Agent | 29 | 02/18/2016 | Yenshui | TPE | Right | Right | 6' 6" | 195 lbs | - |
| Jenkins, Jonathan | 2B | New York Mets | 31 | 08/25/2014 | Baltimore | USA | Switch | Right | 6' 2" | 200 lbs | $25,000,000 |
| Jennings, Tom | C | Free Agent | 20 | 05/09/2025 | Ford City | USA | Right | Right | 6' 1" | 190 lbs | - |
| Jensen, Tom | SP | Kansas City Royals | 25 | 03/19/2020 | New Orleans | USA | Right | Right | 6' 6" | 200 lbs | $1,600,000 |
| Jiang, Chang-wei | 3B | Houston Astros | 27 | 06/18/2018 | Taipei | TPE | Right | Right | 6' 1" | 200 lbs | $1,100,000 |
| JimAnez, Jerry | RP | Chicago White Sox | 22 | 02/19/2023 | Pacora | PAN | Switch | Right | 6' 0" | 200 lbs | $675,000 |
| Jimenez, Hector | SP | Free Agent | 18 | 01/25/2027 | Ciudad Guayana | VEN | Left | Right | 6' 4" | 185 lbs | - |
| Jivotovsky, Helge | LF | Free Agent | 33 | 06/24/2012 | Riga | LVA | Left | Left | 6' 1" | 200 lbs | - |
| Johnson Jr., Randy | SP | Baltimore Orioles | 34 | 11/26/2011 | Walnut Creek | USA | Right | Left | 6' 10" | 215 lbs | $35,200,000 |
| Jonas, Brad | SP | St. Louis Cardinals | 24 | 03/13/2021 | Milwaukee | USA | Left | Left | 6' 2" | 180 lbs | $675,000 |
| Jones, Brian | C | Free Agent | 20 | 01/24/2025 | Rochester | USA | Right | Right | 6' 0" | 190 lbs | - |
| Jones, Casey | SP | Atlanta Braves | 25 | 06/29/2020 | New York | USA | Right | Right | 6' 3" | 190 lbs | $17,000,000 |
| Jones, Judah | SP | Free Agent | 18 | 03/17/2027 | Steger | USA | Left | Right | 6' 2" | 180 lbs | - |
| Jones, Mike | RP | Free Agent | 34 | 07/06/2011 | New Lenox | USA | Left | Left | 6' 4" | 200 lbs | - |
| Jordan, Javy | C | Free Agent | 20 | 11/26/2025 | Walpole | USA | Left | Right | 6' 1" | 200 lbs | - |
| Jordan, John | RP | Boston Red Sox | 23 | 10/08/2022 | Baldwin Park | USA | Right | Right | 6' 4" | 205 lbs | $675,000 |
| Jordan, Mike | SP | Free Agent | 18 | 12/13/2027 | Alum Rock | USA | Right | Right | 6' 8" | 210 lbs | - |
| Jordan, Steve | RF | Pittsburgh Pirates | 33 | 02/01/2012 | Richland Hills | USA | Right | Right | 6' 2" | 190 lbs | $26,000,000 |
| Joseph, Curt | SP | California Angels | 23 | 06/01/2022 | Albany | USA | Left | Left | 6' 4" | 200 lbs | $650,000 |
| Joya, Ricardo | C | Free Agent | 17 | 12/01/2028 | Santiago | CHI | Right | Right | 6' 1" | 190 lbs | - |
| Juarez, Alex | SS | Free Agent | 18 | 01/15/2027 | Monte Cristi | DOM | Right | Right | 6' 0" | 170 lbs | - |
| Juarez, Enrique | LF | Free Agent | 32 | 03/01/2013 | Brooklyn | USA | Right | Right | 6' 2" | 200 lbs | - |
| Juarez, Robby | SS | Montreal Expos | 29 | 11/05/2016 | Villa Carmen | PAN | Right | Right | 6' 0" | 200 lbs | $30,000,000 |
| Judson, Justin | SP | Free Agent | 38 | 07/10/2007 | Laval | CAN | Switch | Right | 5' 11" | 190 lbs | - |
