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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackson, Grayson | SP | Free Agent | 29 | 11/21/2022 | Somers Point | USA | Left | Right | 6' 3" | 200 lbs | - |
| Jackson, K.J. | SP | Reno Aces | 23 | 09/22/2028 | Crockett | USA | Left | Left | 6' 0" | 190 lbs | - |
| Jaimes, Barbossa | SP | Free Agent | 32 | 03/21/2020 | Santo Domingo | DOM | Left | Left | 6' 6" | 200 lbs | - |
| Jalpa, Julian | SP | Tucson Sidewinders | 23 | 09/29/2028 | Philadelphia | USA | Right | Right | 6' 8" | 200 lbs | - |
| Jaquez, Yailen | SP | Free Agent | 34 | 12/01/2017 | Azua | DOM | Right | Right | 6' 3" | 200 lbs | - |
| Jared, Brantley | SP | Toledo Mud Hens | 38 | 07/03/2014 | North Augusta | USA | Left | Right | 6' 9" | 200 lbs | - |
| Jarman, Jason | CF | Victoria HarbourCats | 23 | 09/27/2028 | West Modesto | USA | Right | Right | 6' 1" | 185 lbs | $500,000 |
| Jarrett, Eli | SP | Charlotte Knights | 35 | 03/15/2017 | Overland Park | USA | Left | Left | 6' 2" | 200 lbs | - |
| Jaso, Alexis | RP | Maine Grizzlies | 27 | 01/20/2025 | Chicago | USA | Switch | Right | 6' 3" | 200 lbs | - |
| Jasso, Victorino | RF | Oklahoma City Wranglers | 24 | 04/15/2028 | Santo Domingo | DOM | Left | Left | 5' 10" | 180 lbs | - |
| Jazayeri, Rubens | SP | Oklahoma City Wranglers | 27 | 07/19/2025 | Milwaukee | USA | Right | Right | 5' 11" | 195 lbs | - |
| Jean, Dean | SP | Round Rock Express | 24 | 10/28/2027 | Folsom | USA | Right | Right | 6' 6" | 195 lbs | $500,000 |
| Jenkins, Joe | C | Gwinnett Stripers | 29 | 05/11/2023 | El Paso | USA | Right | Right | 6' 0" | 200 lbs | - |
| Jennings, Willis | SS | Louisville Bats | 28 | 07/08/2024 | Georgina | CAN | Switch | Right | 5' 11" | 180 lbs | - |
| Jeronimo, Jiovanni | SP | Birmingham Barons | 37 | 09/22/2014 | Buckhannon | USA | Right | Right | 6' 9" | 200 lbs | - |
| Jeun, Davey | 1B | Free Agent | 31 | 11/07/2020 | Parma Heights | USA | Right | Right | 6' 2" | 200 lbs | - |
| Jiménez, Bernardo | 1B | Buffalo Bisons | 25 | 07/22/2027 | Caracas | VEN | Right | Right | 6' 1" | 190 lbs | $500,000 |
| Jiménez, Deivi | LF | Victoria HarbourCats | 30 | 01/07/2022 | Bajos de Haina | DOM | Right | Right | 6' 2" | 200 lbs | - |
| Jiménez, Gerson | 3B | Victoria HarbourCats | 28 | 07/01/2024 | Santo Domingo | DOM | Right | Right | 6' 3" | 200 lbs | - |
| Jiménez, Juan | CL | Charlotte Knights | 26 | 11/10/2025 | Caracas | VEN | Right | Right | 6' 2" | 205 lbs | - |
| Jiménez, Julio | C | Nashville Sounds | 28 | 12/31/2023 | Quisqueya | DOM | Right | Right | 6' 0" | 190 lbs | $500,000 |
| Johansen, Christian | C | Free Agent | 31 | 11/17/2020 | Boston | USA | Left | Right | 6' 0" | 200 lbs | - |
| John, Matt | RP | Edmonton Edge | 26 | 09/02/2026 | New York | USA | Switch | Right | 6' 6" | 200 lbs | - |
| Johnson, Alan | RP | Winnipeg Goldeyes | 23 | 08/02/2029 | Port Isabel | USA | Right | Right | 6' 2" | 175 lbs | - |
| Johnson, B.J. | RP | Syracuse Chiefs | 23 | 09/11/2028 | Plentywood | USA | Right | Right | 6' 1" | 200 lbs | - |
| Johnson, Dequan | 2B | Free Agent | 26 | 06/14/2026 | Pembroke Pines | USA | Left | Right | 6' 0" | 195 lbs | - |
| Johnson, Dillon | 2B | Free Agent | 28 | 02/26/2024 | North Richland Hills | USA | Right | Right | 6' 2" | 195 lbs | - |
| Johnson, Jaxon | RP | Albuquerque Isotopes | 25 | 06/26/2027 | Bristol | USA | Right | Right | 6' 8" | 205 lbs | - |
| Johnson, Julio | RP | Tacoma Rainiers | 31 | 10/26/2020 | Country Knolls | USA | Left | Left | 6' 2" | 200 lbs | - |
| Johnson, Lamarr | SP | Reno Aces | 23 | 06/21/2029 | Beaverton | USA | Right | Left | 6' 6" | 200 lbs | - |
| Johnson, Lennox | RP | Free Agent | 36 | 07/17/2016 | Tacoma | USA | Left | Left | 6' 5" | 195 lbs | - |
| Johnson, Ricky | LF | Syracuse Chiefs | 34 | 12/29/2017 | Luverne | USA | Left | Right | 6' 0" | 200 lbs | - |
| Jones, Ashton | C | Syracuse Chiefs | 28 | 04/09/2024 | Indianapolis | USA | Right | Right | 6' 4" | 200 lbs | - |
| Jones, Avraham | SP | Free Agent | 28 | 08/23/2024 | North Las Vegas | USA | Right | Right | 6' 2" | 205 lbs | - |
| Jones, C.J. | SP | Syracuse Chiefs | 27 | 09/04/2025 | Boston | USA | Switch | Right | 6' 5" | 200 lbs | - |
| Jones, Carson | LF | Maine Grizzlies | 23 | 06/19/2029 | Worcester | USA | Right | Right | 6' 2" | 175 lbs | - |
| Jones, Declan | SP | Omaha Storm Chasers | 38 | 06/10/2014 | Paramount | USA | Left | Right | 6' 2" | 200 lbs | - |
| Jones, Donnel | RP | Free Agent | 29 | 11/10/2022 | New York | USA | Right | Right | 6' 1" | 200 lbs | - |
| Jones, Kaden | RP | Evansville Triplets | 28 | 10/02/2023 | Schenectady | USA | Left | Left | 6' 8" | 200 lbs | - |
| Jones, Tito | RP | Free Agent | 27 | 09/28/2024 | Tolleson | USA | Left | Right | 6' 1" | 200 lbs | - |
| Jordan, Jacob | RP | Honolulu ThunderSharks | 27 | 06/25/2025 | Mesa | USA | Switch | Right | 6' 5" | 195 lbs | $500,000 |
| Jordan, Monk | SP | Scranton Dundies | 28 | 08/10/2024 | Casas Adobes | USA | Right | Right | 6' 2" | 200 lbs | - |
| Joyal, Jax | SP | Norfolk Tides | 31 | 10/11/2020 | Highland Park | USA | Switch | Right | 6' 2" | 200 lbs | - |
| Juarez, Pedro | SP | Birmingham Barons | 39 | 01/11/2013 | Santiago | DOM | Right | Right | 6' 5" | 205 lbs | - |
| Jump, Justin | RP | Louisville Bats | 25 | 11/13/2026 | Rock Island | USA | Right | Right | 6' 4" | 200 lbs | - |
