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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackson, Chris | CL | Free Agent | 18 | 06/10/2032 | Tucson | USA | Left | Right | 6' 9" | 210 lbs | - |
| Jackson, Dave | SP | California Angels | 27 | 11/28/2023 | Greenfield | USA | Right | Right | 6' 2" | 185 lbs | $1,437,800 |
| Jackson, Jonathan | SP | Free Agent | 38 | 04/28/2012 | Reed City | USA | Right | Right | 5' 10" | 200 lbs | - |
| Jackson, Vince | 2B | Baltimore Orioles | 27 | 11/06/2023 | Garfield | USA | Right | Right | 6' 0" | 200 lbs | $3,296,000 |
| James, David | SP | Seattle Mariners | 29 | 04/05/2021 | Philadelphia | USA | Left | Left | 6' 2" | 200 lbs | $5,000,000 |
| James, Steve | C | Free Agent | 18 | 04/16/2032 | Santa Clarita | USA | Switch | Right | 6' 4" | 200 lbs | - |
| Jank, Jeff | 1B | Miami Marlins | 36 | 01/19/2014 | Pittsburgh | USA | Right | Right | 6' 6" | 200 lbs | $2,000,000 |
| Jansen, Philip | CF | Free Agent | 34 | 03/09/2016 | Meerzorg | SUR | Right | Right | 6' 3" | 200 lbs | - |
| Jaquez, Mike | 1B | Kansas City Royals | 27 | 06/22/2023 | San Francisco de Macorís | DOM | Right | Right | 6' 1" | 205 lbs | $7,000,000 |
| Jasso, Danny | RF | Free Agent | 17 | 06/10/2033 | Santo Domingo | DOM | Left | Left | 5' 10" | 165 lbs | - |
| Jeleniewski, Brady | 3B | Free Agent | 30 | 04/14/2020 | St. Louis | USA | Right | Right | 5' 10" | 195 lbs | - |
| Jenkins, Jonathan | 2B | Free Agent | 36 | 08/25/2014 | Baltimore | USA | Switch | Right | 6' 2" | 200 lbs | - |
| Jimenez, Hector | CL | Free Agent | 17 | 01/13/2033 | Sitka | USA | Right | Right | 6' 0" | 170 lbs | - |
| Jimenez, Willie | SP | Minnesota Twins | 19 | 11/05/2031 | Santa Cruz del Norte | CUB | Left | Right | 6' 7" | 205 lbs | - |
| Jimenez, Willie | SP | Minnesota Twins | 25 | 12/11/2025 | Ranchuelo | CUB | Right | Left | 6' 2" | 200 lbs | $675,000 |
| Johnson, Jamar | CL | Free Agent | 17 | 07/26/2033 | Paterson | USA | Right | Right | 5' 9" | 155 lbs | - |
| Johnson Jr., Randy | SP | San Francisco Giants | 39 | 11/26/2011 | Walnut Creek | USA | Right | Left | 6' 10" | 210 lbs | $26,500,046 |
| Jonas, Brad | SP | Cincinnati Reds | 29 | 03/13/2021 | Milwaukee | USA | Left | Left | 6' 2" | 195 lbs | $3,024,000 |
| Jones, Casey | SP | Minnesota Twins | 30 | 06/29/2020 | New York | USA | Right | Right | 6' 3" | 200 lbs | $35,000,000 |
| Jones, Cory | RP | Washington Nationals | 26 | 02/16/2024 | Maryland Heights | USA | Right | Right | 6' 2" | 190 lbs | $1,200,000 |
| Jones, Josh | 1B | New York Mets | 25 | 08/07/2025 | Brooklyn | USA | Right | Right | 6' 1" | 190 lbs | $675,000 |
| Jones, McGwire | 3B | St. Louis Cardinals | 23 | 12/06/2027 | St. Louis | USA | Right | Right | 6' 6" | 205 lbs | $675,000 |
| Jones, Mike | RP | Free Agent | 39 | 07/06/2011 | New Lenox | USA | Left | Left | 6' 4" | 200 lbs | - |
| Jones, Spencer | SP | Toronto Blue Jays | 26 | 03/26/2024 | Anse-la-Raye | LCA | Switch | Left | 6' 4" | 200 lbs | $25,000,000 |
| Jordan, Steve | LF | Free Agent | 38 | 02/01/2012 | Richland Hills | USA | Right | Right | 6' 2" | 200 lbs | - |
| Juarez, Robby | SS | Free Agent | 34 | 11/05/2016 | Villa Carmen | PAN | Right | Right | 6' 0" | 200 lbs | - |
| Jurado, Alex | CF | Los Angeles Dodgers | 17 | 11/05/2033 | Mosquera | COL | Right | Right | 6' 2" | 180 lbs | - |
