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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackson, Chris | SP | Northern Virginia Rainbow Mermaids | 38 | 10/24/2023 | Dubuque | USA | Right | Right | 6' 2" | 200 lbs | $9,500,000 |
| Jackson, Rob | LF | Buffalo White Walkers | 30 | 02/05/2032 | St. Petersburg | USA | Right | Left | 6' 2" | 195 lbs | $280,000 |
| Jackson, Tony | LF | Toledo Stingers | 25 | 01/30/2037 | Brooklyn | USA | Right | Right | 6' 1" | 195 lbs | $280,000 |
| Jacobson, Justin | RF | Boston Patriots | 27 | 06/12/2034 | Sheridan | USA | Right | Left | 6' 2" | 200 lbs | $12,742,000 |
| Jensen, Allan | CF | Colorado Billy Goats | 30 | 11/17/2031 | Harlingen | USA | Right | Right | 6' 0" | 200 lbs | $1,450,000 |
| Jessup, Bart | RP | Free Agent | 17 | 12/13/2044 | Spanish Town | JAM | Right | Right | 6' 3" | 175 lbs | - |
| Jewell, Ron | RP | Colorado Billy Goats | 22 | 03/29/2040 | Las Vegas | USA | Switch | Right | 6' 2" | 195 lbs | $280,000 |
| Jin-ah, Ahn | 2B | Boston Patriots | 26 | 09/06/2035 | Jeonju | KOR | Right | Right | 6' 3" | 200 lbs | - |
| Jingella, Kahu | C | Free Agent | 17 | 12/18/2044 | Guarambaré | FIJ | Right | Right | 6' 1" | 185 lbs | - |
| Johnson, Todd | RP | Buffalo White Walkers | 35 | 04/27/2027 | Havre | USA | Right | Right | 6' 2" | 200 lbs | - |
| Johnson, Will | CF | Boston Patriots | 28 | 06/22/2033 | Orem | USA | Right | Right | 5' 11" | 190 lbs | $1,084,000 |
| Johnston, Benton | RP | Buffalo White Walkers | 31 | 06/12/2030 | Los Angeles | USA | Left | Left | 6' 1" | 200 lbs | - |
| Johnston, Chris | SP | Hollywood Shredders | 24 | 03/17/2038 | Ewa Villages | USA | Right | Right | 6' 2" | 190 lbs | $280,000 |
| Johnston, Stanley | C | Hollywood Shredders | 26 | 07/19/2035 | St. Francis | USA | Right | Right | 6' 1" | 200 lbs | $6,000,000 |
| Jones, Dennis | RP | Toronto Thunder | 21 | 10/06/2040 | Richmond | USA | Switch | Right | 6' 2" | 190 lbs | - |
| Jones, Keith | C | Seattle Rocketeers | 26 | 10/22/2035 | Ontario | USA | Right | Right | 6' 1" | 220 lbs | $280,000 |
| Jones, Vincent | SP | Buffalo White Walkers | 27 | 08/01/2034 | Casselberry | USA | Left | Left | 6' 1" | 195 lbs | $669,000 |
| Joseph, Damon | LF | Buffalo White Walkers | 35 | 08/01/2026 | Victorville | USA | Right | Right | 6' 1" | 200 lbs | - |
