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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackson, Chris | CL | Free Agent | 17 | 06/10/2032 | Tucson | USA | Left | Right | 6' 9" | 205 lbs | - |
| Jackson, Jonathan | SP | California Angels | 37 | 04/28/2012 | Reed City | USA | Right | Right | 5' 10" | 200 lbs | $15,000,000 |
| Jackson, Vince | 2B | Baltimore Orioles | 26 | 11/06/2023 | Garfield | USA | Right | Right | 6' 0" | 195 lbs | $1,989,000 |
| James, David | SP | Free Agent | 28 | 04/05/2021 | Philadelphia | USA | Left | Left | 6' 2" | 200 lbs | - |
| James, Steve | C | Free Agent | 17 | 04/16/2032 | Santa Clarita | USA | Switch | Right | 6' 4" | 200 lbs | - |
| Jank, Jeff | 1B | New York Mets | 35 | 01/19/2014 | Pittsburgh | USA | Right | Right | 6' 6" | 200 lbs | $10,600,000 |
| Jansen, Philip | LF | San Francisco Giants | 33 | 03/09/2016 | Meerzorg | SUR | Right | Right | 6' 3" | 200 lbs | $2,250,000 |
| Jaquez, Mike | 2B | Kansas City Royals | 26 | 06/22/2023 | San Francisco de Macorís | DOM | Right | Right | 6' 1" | 200 lbs | $30,400,000 |
| Jaramillo, Danny | RP | Free Agent | 38 | 03/26/2011 | Dorado | PUR | Left | Right | 6' 4" | 200 lbs | - |
| Jeleniewski, Brady | 3B | Free Agent | 29 | 04/14/2020 | St. Louis | USA | Right | Right | 5' 10" | 200 lbs | - |
| Jenkins, Jonathan | 2B | Free Agent | 35 | 08/25/2014 | Baltimore | USA | Switch | Right | 6' 2" | 200 lbs | - |
| Jimenez, Hector | CL | Free Agent | 16 | 01/13/2033 | Sitka | USA | Right | Right | 6' 0" | 170 lbs | - |
| Jimenez, Willie | SP | Minnesota Twins | 18 | 11/05/2031 | Santa Cruz del Norte | CUB | Left | Right | 6' 7" | 200 lbs | - |
| Johnson, Jamar | CL | Free Agent | 16 | 07/26/2033 | Paterson | USA | Right | Right | 5' 9" | 150 lbs | - |
| Johnson Jr., Randy | SP | San Francisco Giants | 38 | 11/26/2011 | Walnut Creek | USA | Right | Left | 6' 10" | 215 lbs | $27,000,046 |
| Jonas, Brad | SP | Cincinnati Reds | 28 | 03/13/2021 | Milwaukee | USA | Left | Left | 6' 2" | 190 lbs | $2,400,000 |
| Jones, Bobby | SP | Free Agent | 27 | 05/01/2022 | Des Moines | USA | Left | Left | 6' 1" | 200 lbs | - |
| Jones, Casey | SP | Minnesota Twins | 29 | 06/29/2020 | New York | USA | Right | Right | 6' 3" | 200 lbs | $35,000,000 |
| Jones, Josh | 1B | New York Mets | 24 | 08/07/2025 | Brooklyn | USA | Right | Right | 6' 1" | 185 lbs | $675,000 |
| Jones, Mike | RP | Detroit Tigers | 38 | 07/06/2011 | New Lenox | USA | Left | Left | 6' 4" | 200 lbs | $2,800,000 |
| Jones, Spencer | SP | Toronto Blue Jays | 25 | 03/26/2024 | Anse-la-Raye | LCA | Switch | Left | 6' 4" | 205 lbs | $18,750,000 |
| Jones, Steve | C | Baltimore Orioles | 25 | 11/08/2024 | Port Orange | USA | Right | Right | 6' 1" | 200 lbs | $675,000 |
| Jordahl, Joe | SP | Kansas City Royals | 28 | 04/21/2021 | Center Point | USA | Right | Right | 6' 3" | 200 lbs | $675,000 |
| Jordan, John | RP | Boston Red Sox | 27 | 10/08/2022 | Baldwin Park | USA | Right | Right | 6' 4" | 205 lbs | $1,824,100 |
| Jordan, Steve | LF | Free Agent | 37 | 02/01/2012 | Richland Hills | USA | Right | Right | 6' 2" | 195 lbs | - |
| Juarez, Robby | SS | Free Agent | 33 | 11/05/2016 | Villa Carmen | PAN | Right | Right | 6' 0" | 200 lbs | - |
