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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackson, Alan | SP | Free Agent | 28 | 10/18/2026 | New York | USA | Right | Right | 6' 4" | 195 lbs | - |
| Jaguar, John | 2B | Monongahela Monsters | 23 | 05/17/2031 | Los Trujillos-Gabaldon | USA | Right | Right | 6' 1" | 190 lbs | - |
| Jarvi, Kauto | 2B | Sioux Falls Red Pandas | 29 | 04/03/2025 | Suomussalmi | FIN | Right | Right | 6' 0" | 180 lbs | - |
| Jenkins, Matt | RP | Baton Rouge Brass | 32 | 06/28/2022 | Boulder | USA | Right | Right | 6' 3" | 200 lbs | - |
| Johnson, Bob | LF | Monongahela Monsters | 26 | 03/20/2028 | Ft. Worth | USA | Right | Right | 5' 10" | 200 lbs | - |
| Johnson, Jason | 1B | Sioux Falls Red Pandas | 25 | 08/19/2029 | Brooklyn | USA | Right | Right | 6' 2" | 205 lbs | $280,000 |
| Johnson, Rodney | RP | Sioux Falls Red Pandas | 33 | 01/23/2021 | Santa Maria | USA | Right | Right | 6' 2" | 200 lbs | $280,000 |
| Johnston, Alex | C | Athletic Club KC Reserves | 30 | 09/28/2024 | Plympton | USA | Switch | Right | 6' 0" | 210 lbs | - |
| Jones, Chris | 2B | Monongahela Monsters | 30 | 08/25/2024 | Pewaukee Village | USA | Right | Right | 6' 0" | 205 lbs | - |
| Jones, Kel | RF | Bakersfield Nobles | 27 | 02/13/2027 | Monroe | USA | Left | Left | 6' 1" | 200 lbs | $280,000 |
| Jones, Sean | SP | Sioux Falls Red Pandas | 33 | 03/14/2021 | Little Rock | USA | Right | Right | 6' 6" | 200 lbs | - |
| Joo, Tso-i | C | Sioux Falls Red Pandas | 34 | 01/26/2020 | Tainan | TPE | Right | Right | 6' 3" | 205 lbs | - |
| Jordan, Jim | SP | Alaskan Humpbacks | 32 | 04/07/2022 | New York | USA | Switch | Right | 6' 7" | 200 lbs | - |
| Judkins, Damien | RF | Sioux Falls Red Pandas | 28 | 08/19/2026 | San Ignacio | BLZ | Right | Right | 6' 0" | 200 lbs | - |
