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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackson, Bill | RF | Free Agent | 27 | 06/02/2025 | Charlton | USA | Left | Right | 6' 4" | 205 lbs | - |
| Jackson, Peter | RP | Oakland Oaks | 24 | 06/16/2028 | Salem | USA | Switch | Right | 6' 2" | 200 lbs | $280,000 |
| Janero, Marcos | LF | San Mateo Dirty Reds | 30 | 08/15/2022 | Quepos | CRC | Right | Right | 6' 4" | 200 lbs | $14,600,000 |
| Jenkins, Ed | RP | Pittsburgh Kingfishers | 26 | 07/13/2026 | Brooklyn | USA | Right | Right | 6' 4" | 200 lbs | $280,000 |
| Johns, Jimmy | 2B | San Mateo Dirty Reds | 26 | 08/10/2026 | Shelby | USA | Right | Right | 6' 2" | 195 lbs | $280,000 |
| Johnson, Hubert | RP | Greenville 84s | 27 | 09/23/2025 | Jackson | USA | Right | Left | 5' 10" | 175 lbs | $280,000 |
| Johnson, Jim | C | Pittsburgh Kingfishers | 27 | 10/16/2025 | Davenport | USA | Switch | Right | 6' 3" | 205 lbs | $280,000 |
| Johnson, John | CF | Oakland Oaks | 29 | 10/10/2023 | Wichita Falls | USA | Right | Right | 6' 2" | 195 lbs | $13,000,000 |
| Johnston, Tom | SP | Athletic Club KC | 27 | 03/25/2025 | New York | USA | Left | Left | 6' 6" | 200 lbs | $13,999,000 |
| Johnston, Wes | SP | Pittsburgh Kingfishers | 27 | 10/16/2025 | San Diego | USA | Left | Left | 6' 0" | 200 lbs | $450,000 |
| Jones, Johnny | C | Buffalo White Walkers | 35 | 07/12/2017 | Glenn Dale | USA | Right | Right | 5' 10" | 195 lbs | $700,000 |
| Jordan, Jim | SP | Greenville 84s | 30 | 04/07/2022 | New York | USA | Switch | Right | 6' 7" | 205 lbs | $3,400,000 |
| Joseph, Damon | CF | San Mateo Dirty Reds | 26 | 08/01/2026 | Victorville | USA | Right | Right | 6' 1" | 200 lbs | $280,000 |
| Joseph, Nick | SP | Oakland Oaks | 33 | 12/28/2019 | Audubon | USA | Left | Left | 6' 4" | 200 lbs | $7,500,000 |
| Joubert, Robert | RP | San Mateo Dirty Reds | 25 | 07/10/2027 | Saint-Ouen-lAumône | FRA | Left | Left | 6' 8" | 200 lbs | $280,000 |
| Jouda, Eiichi | SP | Boston Patriots | 16 | 07/05/2036 | Fukuyama | JPN | Right | Right | 5' 9" | 155 lbs | - |
| Juderías, Mariano | RF | Athletic Club KC | 33 | 08/14/2019 | Santiago de Cuba | CUB | Right | Right | 6' 1" | 190 lbs | $7,900,000 |
