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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackson, Doug | SP | Washington Eagles | 28 | 06/09/2026 | Fall River | USA | Left | Left | 6' 4" | 200 lbs | $1,298,400 |
| Jackson, Jeff | 1B | Washington Eagles | 34 | 01/27/2021 | Ionia | USA | Left | Left | 6' 2" | 200 lbs | $550,000 |
| Jalili, Gene | CF | South Fork Frogs | 29 | 03/29/2026 | Nashua | USA | Switch | Right | 6' 3" | 200 lbs | $8,015,000 |
| James, Aidan | SS | Washington Eagles | 18 | 11/29/2036 | Portmore | JAM | Right | Right | 6' 1" | 170 lbs | - |
| James, Alan | RF | Washington Eagles | 32 | 01/04/2023 | Gray | USA | Right | Right | 6' 4" | 200 lbs | $1,600,000 |
| Jaramillo, José | RP | Seattle Reign | 31 | 01/16/2024 | San José de las Matas | DOM | Right | Right | 6' 0" | 190 lbs | $3,750,000 |
| Jaramillo, José | SP | Macon Bacon | 17 | 09/07/2037 | La Vega | DOM | Right | Right | 6' 2" | 175 lbs | - |
| Jennings, David | RP | Potomac Double O's | 36 | 09/05/2018 | Weigelstown | USA | Left | Left | 6' 4" | 200 lbs | $1,200,000 |
| Jiménez, Emílio | LF | Free Agent | 16 | 10/16/2038 | Havana | CUB | Right | Right | 6' 2" | 185 lbs | - |
| Jiménez, José | RF | San Jose Quakes | 18 | 08/08/2036 | Maracaibo | VEN | Left | Left | 6' 1" | 185 lbs | - |
| Jiménez, Pablo | SP | Seattle Reign | 17 | 07/04/2037 | Calabozo | VEN | Right | Right | 6' 2" | 175 lbs | - |
| Johns, Marvin | C | South Fork Frogs | 24 | 02/08/2031 | Clyde Hill | USA | Switch | Right | 6' 1" | 200 lbs | $350,000 |
| Johns, Oliver | 3B | Austin Aces | 31 | 05/23/2023 | Creedmoor | USA | Switch | Right | 6' 0" | 205 lbs | $7,500,000 |
| Johnson, Chris | CF | Free Agent | 38 | 04/20/2017 | Indianapolis | USA | Right | Right | 6' 4" | 200 lbs | - |
| Johnson, Ryan | RP | Free Agent | 37 | 01/28/2018 | Scottsdale | USA | Right | Right | 6' 2" | 195 lbs | - |
| Johnston, Jason | CF | Greenfield Cougars | 26 | 01/18/2029 | Grand Prairie | USA | Right | Right | 6' 3" | 205 lbs | $350,000 |
| Johnston, Pat | RP | Virginia Beach Stars | 35 | 05/27/2019 | Sparks | USA | Switch | Right | 5' 9" | 190 lbs | $790,000 |
| Jones, Allen | SP | Greenfield Cougars | 34 | 02/28/2021 | Kaufman | USA | Right | Right | 6' 0" | 190 lbs | $350,000 |
| Jones, Justin | 3B | Virginia Beach Stars | 36 | 04/26/2019 | Dallas | USA | Right | Right | 5' 10" | 180 lbs | $2,500,000 |
| Jones, Quinn | CF | San Diego Storm | 27 | 08/01/2027 | Daly City | USA | Right | Right | 6' 0" | 200 lbs | $17,000,000 |
| Jones, Ray | 2B | Free Agent | 32 | 05/30/2022 | Swansea | USA | Right | Right | 6' 0" | 200 lbs | - |
| Jordan, Fred | SP | San Diego Storm | 37 | 03/10/2018 | Mercer Island | USA | Right | Right | 6' 1" | 205 lbs | $17,000,000 |
| Jorisz, Peer | 1B | South Fork Frogs | 32 | 10/01/2022 | Kralendijk | ANT | Right | Right | 6' 4" | 200 lbs | $10,000,000 |
| Juarros, Juan | CF | Free Agent | 32 | 08/24/2022 | Santiago | DOM | Left | Left | 6' 3" | 200 lbs | - |
| Juárez, Pedro | RP | Virginia Beach Stars | 33 | 05/13/2021 | Barquisimeto | VEN | Right | Right | 6' 3" | 200 lbs | $1,300,000 |
