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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackson, Chris | SP | Northern Virginia Rainbow Mermaids | 37 | 10/24/2023 | Dubuque | USA | Right | Right | 6' 2" | 200 lbs | $9,500,000 |
| Jackson, Rob | LF | Buffalo White Walkers | 29 | 02/05/2032 | St. Petersburg | USA | Right | Left | 6' 2" | 195 lbs | $280,000 |
| Jackson, Tony | RF | Toledo Stingers | 24 | 01/30/2037 | Brooklyn | USA | Right | Right | 6' 1" | 200 lbs | $280,000 |
| Jacobson, Justin | LF | Mexico City Blue Demons | 27 | 06/12/2034 | Sheridan | USA | Right | Left | 6' 2" | 200 lbs | $8,700,000 |
| Jarvis, Mark | C | Seattle Rocketeers | 25 | 04/16/2036 | New York | USA | Right | Right | 6' 1" | 200 lbs | $280,000 |
| Jessup, Bart | RP | Free Agent | 16 | 12/13/2044 | Spanish Town | JAM | Right | Right | 6' 2" | 175 lbs | - |
| Johnson, Todd | SP | Mexico City Blue Demons | 34 | 04/27/2027 | Havre | USA | Right | Right | 6' 2" | 200 lbs | $750,000 |
| Johnston, Chris | SP | Hollywood Shredders | 23 | 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 | $2,400,000 |
| Johnston, Tom | SP | Mexico City Blue Demons | 36 | 03/25/2025 | New York | USA | Left | Left | 6' 6" | 210 lbs | $7,200,000 |
| Johnston, Wes | SP | Northern Virginia Rainbow Mermaids | 35 | 10/16/2025 | San Diego | USA | Left | Left | 6' 0" | 195 lbs | $6,500,000 |
| Jokinen, Jami | RP | Toronto Thunder | 33 | 12/07/2027 | Gyal | HUN | Right | Right | 6' 3" | 205 lbs | $3,000,000 |
| Jones, Ernie | RP | Mexico City Blue Demons | 36 | 08/31/2024 | Monee | USA | Left | Left | 6' 0" | 200 lbs | $700,000 |
| Jones, Vincent | SP | Buffalo White Walkers | 27 | 08/01/2034 | Casselberry | USA | Left | Left | 6' 1" | 195 lbs | $280,000 |
| Jong, Xi-ku | SS | New Orleans Voodoo | 16 | 11/05/2044 | Tanggu | CHN | Right | Right | 6' 4" | 200 lbs | - |
| Joseph, Mike | LF | Northern Virginia Rainbow Mermaids | 30 | 05/28/2031 | San Ramon | USA | Left | Left | 6' 3" | 200 lbs | $3,200,000 |
| Jouon, Nori | SP | Mexico City Blue Demons | 16 | 03/10/2045 | Kurume | JPN | Right | Right | 6' 3" | 185 lbs | - |
