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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackson, Todd | RP | Vancouver Grey Wolves | 31 | 08/18/2025 | Norwalk | USA | Right | Right | 6' 2" | 205 lbs | $5,000,000 |
| Jackson, Wayne | LF | Vancouver Grey Wolves | 30 | 12/24/2026 | Pittsburgh | USA | Left | Right | 6' 2" | 200 lbs | $3,900,000 |
| Jen, Ze-dong | CF | Free Agent | 16 | 11/16/2040 | Hsintien | TPE | Right | Right | 6' 0" | 160 lbs | - |
| Jenkins, Matt | RP | Long Island Lighthouse | 34 | 06/28/2022 | Boulder | USA | Right | Right | 6' 3" | 200 lbs | $280,000 |
| Jensen, Allan | CF | Seattle Rocketeers | 25 | 11/17/2031 | Harlingen | USA | Right | Right | 6' 0" | 200 lbs | $280,000 |
| Jian, Ning | RP | Free Agent | 19 | 05/08/2037 | Sanhsia | TPE | Right | Right | 6' 1" | 165 lbs | - |
| Johnson, Jason | 1B | New Orleans Voodoo | 27 | 08/19/2029 | Brooklyn | USA | Right | Right | 6' 2" | 205 lbs | $280,000 |
| Johnson, John | CF | Seattle Rocketeers | 33 | 10/10/2023 | Wichita Falls | USA | Right | Right | 6' 2" | 200 lbs | $1,000,000 |
| Johnson, Todd | CL | Seattle Rocketeers | 29 | 04/27/2027 | Havre | USA | Right | Right | 6' 2" | 200 lbs | $3,500,000 |
| Johnston, Alex | C | Athletic Club KC | 32 | 09/28/2024 | Plympton | USA | Switch | Right | 6' 0" | 205 lbs | $600,000 |
| Johnston, Tom | SP | Seattle Rocketeers | 31 | 03/25/2025 | New York | USA | Left | Left | 6' 6" | 210 lbs | $28,000,000 |
| Johnston, Wes | SP | New Orleans Voodoo | 31 | 10/16/2025 | San Diego | USA | Left | Left | 6' 0" | 195 lbs | $12,000,000 |
| Jones, Ernie | RP | Vancouver Grey Wolves | 32 | 08/31/2024 | Monee | USA | Left | Left | 6' 0" | 200 lbs | $2,100,000 |
| Jones, Kel | RF | Boston Patriots | 29 | 02/13/2027 | Monroe | USA | Left | Left | 6' 1" | 200 lbs | $280,000 |
| Jones, Martin | C | Seattle Rocketeers | 26 | 08/24/2030 | McAlmont | USA | Left | Right | 6' 0" | 215 lbs | $280,000 |
| Jongenelen, Denis | RP | D.C. Divided | 32 | 06/14/2024 | Labadera | CUR | Switch | Right | 5' 9" | 170 lbs | $1,200,000 |
| Joseph, Bill | RP | D.C. Divided | 24 | 03/12/2032 | Roselle Park | USA | Right | Right | 6' 7" | 210 lbs | $280,000 |
| Juderías, Mariano | RF | Vancouver Grey Wolves | 37 | 08/14/2019 | Santiago de Cuba | CUB | Right | Right | 6' 1" | 205 lbs | $10,000,000 |
| Jusino, Rubén | C | Vancouver Grey Wolves | 33 | 07/15/2023 | Esperanza | DOM | Right | Right | 6' 3" | 205 lbs | $8,750,000 |
| Juárez, Paul | 2B | Buffalo White Walkers | 17 | 04/24/2039 | Belmopan | BLZ | Right | Right | 6' 0" | 170 lbs | - |
