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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackson, Jayden | 1B | Free Agent | 19 | 06/25/2027 | Plymouth | USA | Right | Right | 6' 2" | 200 lbs | - |
| Jackson, Jonathan | SP | Montreal Expos | 34 | 04/28/2012 | Reed City | USA | Right | Right | 5' 10" | 200 lbs | $30,000,000 |
| Jank, Jeff | SP | New York Mets | 32 | 01/19/2014 | Pittsburgh | USA | Right | Right | 6' 6" | 200 lbs | $18,700,000 |
| Jansen, Philip | LF | Oakland Athletics | 30 | 03/09/2016 | Meerzorg | SUR | Right | Right | 6' 3" | 200 lbs | $2,200,000 |
| Jaramillo, Danny | RP | Free Agent | 35 | 03/26/2011 | Dorado | PUR | Left | Right | 6' 4" | 200 lbs | - |
| Jauregui, Jerry | C | Free Agent | 31 | 06/04/2015 | Tepic | MEX | Right | Right | 6' 3" | 200 lbs | - |
| Jefferies, Danny | LF | Free Agent | 16 | 01/31/2030 | Country Club | USA | Right | Right | 6' 0" | 185 lbs | - |
| Jeleniewski, Brady | SS | Detroit Tigers | 26 | 04/14/2020 | St. Louis | USA | Right | Right | 5' 10" | 190 lbs | $675,000 |
| Jenkins, Jonathan | 2B | New York Mets | 32 | 08/25/2014 | Baltimore | USA | Switch | Right | 6' 2" | 200 lbs | $25,000,000 |
| Jennings, Ben | RP | Oakland Athletics | 28 | 12/25/2018 | Seattle | USA | Right | Right | 5' 11" | 190 lbs | $980,000 |
| Jennings, Tom | C | Free Agent | 17 | 05/09/2029 | Ford City | USA | Right | Right | 6' 1" | 190 lbs | - |
| Jiang, Chang-wei | 3B | Houston Astros | 28 | 06/18/2018 | Taipei | TPE | Right | Right | 6' 1" | 200 lbs | $1,300,000 |
| Jimenez, Hector | SP | Free Agent | 16 | 01/25/2030 | Ciudad Guayana | VEN | Left | Right | 6' 4" | 180 lbs | - |
| Jimenez, Willie | RP | Houston Astros | 23 | 11/24/2023 | La Vega | DOM | Left | Right | 6' 2" | 195 lbs | $675,000 |
| Johnson Jr., Randy | SP | Baltimore Orioles | 35 | 11/26/2011 | Walnut Creek | USA | Right | Left | 6' 10" | 215 lbs | $35,200,000 |
| Jonas, Brad | RP | Baltimore Orioles | 25 | 03/13/2021 | Milwaukee | USA | Left | Left | 6' 2" | 185 lbs | $675,000 |
| Jones, Bobby | RP | Detroit Tigers | 24 | 05/01/2022 | Des Moines | USA | Left | Left | 6' 1" | 195 lbs | $675,000 |
| Jones, Brian | C | Free Agent | 18 | 01/24/2028 | Rochester | USA | Right | Right | 6' 0" | 195 lbs | - |
| Jones, Casey | SP | Atlanta Braves | 26 | 06/29/2020 | New York | USA | Right | Right | 6' 3" | 195 lbs | $17,000,000 |
| Jones, Judah | SP | Free Agent | 19 | 03/17/2027 | Steger | USA | Left | Right | 6' 3" | 185 lbs | - |
| Jones, Mike | RP | Free Agent | 35 | 07/06/2011 | New Lenox | USA | Left | Left | 6' 4" | 200 lbs | - |
| Jones, Spencer | SP | Toronto Blue Jays | 22 | 03/26/2024 | Anse-la-Raye | LCA | Switch | Left | 6' 4" | 210 lbs | $675,000 |
| Jordan, Javy | C | Free Agent | 18 | 11/26/2028 | Walpole | USA | Left | Right | 6' 1" | 200 lbs | - |
| Jordan, John | RP | Boston Red Sox | 24 | 10/08/2022 | Baldwin Park | USA | Right | Right | 6' 4" | 205 lbs | $675,000 |
| Jordan, Mike | SP | Free Agent | 17 | 12/13/2029 | Alum Rock | USA | Right | Right | 6' 10" | 205 lbs | - |
| Jordan, Steve | RF | Free Agent | 34 | 02/01/2012 | Richland Hills | USA | Right | Right | 6' 2" | 190 lbs | - |
| Joseph, Curt | RP | Houston Astros | 24 | 06/01/2022 | Albany | USA | Left | Left | 6' 4" | 200 lbs | $675,000 |
| Joseph, Steffen | SP | Free Agent | 35 | 07/25/2011 | Ostermundingen | SUI | Right | Right | 6' 0" | 200 lbs | - |
| Joya, Ricardo | C | Atlanta Braves | 18 | 12/01/2028 | Santiago | CHI | Right | Right | 6' 1" | 195 lbs | - |
| Joyce, Jarrod | 3B | Free Agent | 34 | 09/26/2012 | Mattoon | USA | Right | Right | 6' 2" | 190 lbs | - |
| Juarez, Enrique | LF | Free Agent | 33 | 03/01/2013 | Brooklyn | USA | Right | Right | 6' 2" | 200 lbs | - |
| Juarez, Jon | RP | Free Agent | 26 | 07/01/2020 | The Colony | USA | Right | Right | 5' 11" | 190 lbs | - |
| Juarez, Robby | SS | Montreal Expos | 30 | 11/05/2016 | Villa Carmen | PAN | Right | Right | 6' 0" | 200 lbs | $30,000,000 |
