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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| James, Florian | SP | Athletic Club KC | 16 | 08/22/2031 | Remire-Montjoly | GUF | Right | Right | 5' 11" | 155 lbs | - |
| James, Kenny | RP | Free Agent | 33 | 06/29/2014 | Aurora | USA | Left | Left | 6' 4" | 200 lbs | - |
| Janero, Marcos | CF | Northern Virginia Rainbow Mermaids | 25 | 08/15/2022 | Quepos | CRC | Right | Right | 6' 4" | 200 lbs | $9,600,000 |
| Janssen, Job | RP | Greenville 84s | 30 | 08/26/2017 | Montaña Rey | CUR | Right | Right | 6' 2" | 190 lbs | $2,400,000 |
| Jaraba, Branlyn | RP | St. Louis Coeur | 33 | 04/11/2014 | Envigado | COL | Right | Right | 6' 4" | 200 lbs | $7,000,000 |
| Jenkins, Brenton | SP | St. Louis Coeur | 28 | 06/17/2019 | Plainfield | USA | Right | Right | 6' 6" | 210 lbs | $580,000 |
| Joe, Byron | SP | Seattle Rocketeers | 27 | 09/16/2020 | Vallejo | USA | Right | Right | 6' 4" | 200 lbs | $1,000,000 |
| Johnson, Todd | SP | Seattle Rocketeers | 20 | 04/27/2027 | Havre | USA | Right | Right | 6' 2" | 190 lbs | $280,000 |
| Johnston, Tom | SP | Athletic Club KC | 22 | 03/25/2025 | New York | USA | Left | Left | 6' 6" | 210 lbs | $280,000 |
| Jones, Clarence | SP | Long Island Lighthouse | 31 | 07/23/2016 | Kansas City | USA | Left | Right | 6' 3" | 205 lbs | $280,000 |
| Jones, Johnny | SP | Vancouver Grey Wolves | 30 | 08/16/2017 | Houston | USA | Right | Right | 6' 0" | 200 lbs | $5,800,000 |
| Jones, Johnny | C | Athletic Club KC | 30 | 07/12/2017 | Glenn Dale | USA | Right | Right | 5' 10" | 195 lbs | $3,400,000 |
| Jones, Leslie | 3B | Free Agent | 22 | 05/07/2025 | Kendale Lakes | USA | Right | Right | 5' 10" | 180 lbs | - |
| Jones, Sean | SP | Northern Virginia Rainbow Mermaids | 26 | 03/14/2021 | Little Rock | USA | Right | Right | 6' 6" | 205 lbs | $540,000 |
| Juderías, Mariano | RF | Vancouver Grey Wolves | 28 | 08/14/2019 | Santiago de Cuba | CUB | Right | Right | 6' 1" | 185 lbs | $10,500,000 |
| Juárez, Ánibal | 3B | Vancouver Grey Wolves | 17 | 05/01/2030 | Santo Domingo | DOM | Right | Right | 6' 3" | 185 lbs | - |
