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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackson, Chris | SP | Thunder Bay Northern Lions BC | 25 | 10/24/2023 | Dubuque | USA | Right | Right | 6' 2" | 205 lbs | $280,000 |
| Jackson, Ron | SS | Buckhead Bowties | 27 | 05/05/2021 | Central Heights-Midland City | USA | Right | Right | 6' 4" | 200 lbs | $280,000 |
| Jacobson, Jeff | LF | Free Agent | 26 | 12/15/2022 | Toms River | USA | Left | Left | 6' 0" | 200 lbs | - |
| Jefferson, Millard | SS | Free Agent | 17 | 04/04/2031 | Astumbo | GUM | Right | Right | 6' 4" | 180 lbs | - |
| Jennings, Ken | RP | Free Agent | 28 | 04/29/2020 | Santa Ana | USA | Left | Left | 6' 2" | 200 lbs | - |
| Jerger, Fred | RP | Thunder Bay Northern Lions BC | 28 | 01/03/2020 | Lake Charles | USA | Right | Right | 6' 1" | 200 lbs | $500,000 |
| Jianbua, Zhen-ying | C | Nashville Outlaws | 16 | 02/10/2032 | Taipei | TPE | Right | Right | 6' 1" | 185 lbs | - |
| Johns, Denis | RP | Free Agent | 26 | 11/06/2022 | Inglewood | USA | Right | Right | 6' 0" | 205 lbs | - |
| Johnson, Eli | 2B | Oakland Oaks | 26 | 08/09/2022 | Savannah | USA | Right | Right | 6' 0" | 200 lbs | $280,000 |
| Johnson, John | 2B | Oakland Oaks | 25 | 10/10/2023 | Wichita Falls | USA | Right | Right | 6' 2" | 195 lbs | $3,000,000 |
| Johnson, Nathan | RP | Free Agent | 25 | 07/29/2023 | San Diego | USA | Switch | Right | 6' 4" | 200 lbs | - |
| Johnson, Peter | RF | Free Agent | 23 | 06/17/2025 | Rocky Mount | USA | Right | Right | 6' 2" | 200 lbs | - |
| Jokinen, Kimmo-Mikka | RP | Nashville Outlaws | 28 | 01/18/2020 | Babolna | HUN | Right | Right | 6' 1" | 190 lbs | $280,000 |
| Jongenelen, Denis | RP | Charleston Battery | 24 | 06/14/2024 | Labadera | CUR | Switch | Right | 5' 9" | 160 lbs | $280,000 |
| Jortikka, Manu | RP | Kingston Township Knights | 32 | 09/02/2016 | Zsombó | HUN | Right | Left | 6' 1" | 200 lbs | $460,000 |
| Joseph, King | SP | Nashville Outlaws | 27 | 09/06/2021 | Foothill Farms | USA | Right | Right | 6' 2" | 190 lbs | $630,000 |
| Joseph, Nick | SP | Oakland Oaks | 29 | 12/28/2019 | Audubon | USA | Left | Left | 6' 4" | 200 lbs | $950,000 |
| Jusino, Rubén | C | Buckhead Bowties | 25 | 07/15/2023 | Esperanza | DOM | Right | Right | 6' 3" | 210 lbs | $12,862,500 |
