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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackson, Daniel | LF | Frederick Keys | 19 | 05/31/2025 | Laurens | USA | Right | Right | 6' 4" | 215 lbs | - |
| Jackson, Eric | CF | Frederick Keys | 20 | 03/29/2024 | Lawrence | USA | Left | Left | 6' 1" | 195 lbs | - |
| Jackson, Graham | SP | Salem Red Sox | 19 | 08/06/2025 | Toronto | CAN | Switch | Right | 6' 2" | 185 lbs | - |
| Jacobo, Jordan | RP | Dunedin Blue Jays | 22 | 01/05/2022 | Maracay | VEN | Right | Right | 6' 0" | 200 lbs | - |
| Jacobs, Bill | SP | Lake Elsinore Storm | 22 | 07/21/2022 | King City | USA | Left | Right | 6' 3" | 190 lbs | - |
| Jacobsen, Trevor | RP | Bakersfield Blaze | 22 | 08/31/2022 | Keller | USA | Left | Right | 6' 1" | 195 lbs | - |
| Jamison, Kevon | SP | Bakersfield Blaze | 21 | 05/18/2023 | Los Angeles | USA | Switch | Right | 6' 7" | 205 lbs | - |
| Jenifer, Adonis | RF | Carolina Mudcats | 21 | 07/07/2023 | Menomonie | USA | Right | Left | 6' 0" | 190 lbs | - |
| Jennings, Ben | 3B | Tampa Yankees | 20 | 06/09/2024 | Kingston | JAM | Right | Right | 6' 2" | 195 lbs | - |
| Joe, Yeong-hun | SS | Palm Beach Cardinals | 23 | 01/22/2021 | Pyongyang | PRK | Left | Right | 6' 1" | 185 lbs | - |
| Joe, Zhao-ying | SP | St. Lucie Mets | 19 | 11/06/2025 | Hsinchuang | TPE | Right | Right | 6' 1" | 165 lbs | - |
| Johnson, Jaylen | RP | Clearwater Threshers | 24 | 11/10/2020 | Chantilly | USA | Right | Right | 6' 0" | 180 lbs | - |
| Johnston, Bryan | LF | Daytona Tortugas | 21 | 10/12/2023 | Tampa | USA | Switch | Right | 6' 2" | 200 lbs | - |
| Johnston, Jamie | RP | Bakersfield Blaze | 22 | 10/14/2022 | Tuolumne City | USA | Switch | Right | 6' 1" | 185 lbs | - |
| Johnston, Ryan | SS | Richmond Flying Squirrels | 26 | 09/30/2018 | New York | USA | Right | Right | 6' 1" | 200 lbs | - |
| Jones, Cory | RP | Potomac Nationals | 20 | 02/16/2024 | Maryland Heights | USA | Right | Right | 6' 2" | 185 lbs | - |
| Jones, Davion | CL | High Desert Mavericks | 25 | 01/31/2019 | Hesperia | USA | Right | Right | 6' 4" | 200 lbs | - |
| Jones, Josh | 2B | St. Lucie Mets | 19 | 08/07/2025 | Brooklyn | USA | Right | Right | 6' 1" | 185 lbs | - |
| Jones, Kelvin | RF | Lancaster JetHawks | 21 | 08/17/2023 | San Rafael | USA | Left | Left | 6' 0" | 185 lbs | - |
| Jones, Mark | 2B | Winston-Salem Dash | 20 | 05/23/2024 | Victoria | USA | Right | Right | 6' 1" | 200 lbs | - |
| Jones, Oren | 1B | Inland Empire 66ers | 22 | 07/29/2022 | Belfast | NIR | Right | Right | 6' 0" | 195 lbs | - |
| Joy, Chase | RP | Richmond Flying Squirrels | 24 | 05/07/2020 | Killeen | USA | Right | Right | 6' 0" | 195 lbs | - |
| Juarez, Jon | RP | Frederick Keys | 24 | 07/01/2020 | The Colony | USA | Right | Right | 5' 11" | 180 lbs | - |
| Julien, Chris | SP | Bakersfield Blaze | 21 | 04/28/2023 | Youngstown | USA | Right | Right | 6' 2" | 200 lbs | - |
| Jung, Yoo-chul | SS | Jupiter Hammerheads | 27 | 07/22/2017 | Ochon | KOR | Switch | Right | 6' 2" | 200 lbs | - |
| Justice, Rich | 3B | Lake Elsinore Storm | 22 | 04/08/2022 | Los Angeles | USA | Right | Right | 6' 5" | 195 lbs | - |
