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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackson, Billy | 3B | Lakeland Flying Tigers | 23 | 10/11/2018 | Overland Park | USA | Right | Right | 6' 2" | 200 lbs | - |
| Jackson, Don | RP | Clearwater Threshers | 25 | 11/17/2016 | Indianapolis | USA | Right | Right | 6' 5" | 200 lbs | - |
| Jackson, Jeremy | RP | Clearwater Threshers | 28 | 06/22/2014 | Grand Chute | USA | Left | Right | 6' 0" | 190 lbs | - |
| Jefferson, Artie | RP | Dunedin Blue Jays | 23 | 05/14/2019 | Gorham | USA | Right | Right | 5' 11" | 180 lbs | - |
| Jefferson, Sam | CL | Lakeland Flying Tigers | 34 | 01/19/2008 | Antioch | USA | Right | Right | 6' 4" | 195 lbs | - |
| Jenkins, Chris | SP | Clearwater Threshers | 20 | 07/10/2021 | Shelley | USA | Right | Right | 6' 5" | 195 lbs | - |
| Jiménez, Iván | SP | Free Agent | 25 | 05/19/2017 | Santo Domingo | DOM | Right | Right | 6' 4" | 200 lbs | - |
| Jiménez, Norberto | RP | Bradenton Marauders | 22 | 02/02/2020 | San Francisco de Macorís | DOM | Right | Right | 6' 5" | 200 lbs | - |
| Johnson, Artie | RP | Bradenton Marauders | 20 | 08/06/2021 | Anchorage | USA | Right | Right | 6' 2" | 175 lbs | - |
| Johnston, Josh | CF | Bradenton Marauders | 22 | 09/21/2019 | Sacramento | USA | Switch | Right | 6' 0" | 175 lbs | - |
| Johnston, Sean | SP | Fort Myers Mighty Mussels | 22 | 04/23/2020 | Yonkers | USA | Right | Right | 6' 7" | 195 lbs | - |
| Johnstone, Hugh | LF | Tampa Tarpons | 27 | 06/10/2015 | Opelika | USA | Right | Right | 5' 10" | 190 lbs | - |
| Jokela, Uolevi | SS | Clearwater Threshers | 24 | 06/16/2018 | Camden | USA | Left | Right | 6' 2" | 200 lbs | - |
| Jones, Brad | CF | Daytona Tortugas | 24 | 05/04/2018 | New York | USA | Left | Left | 5' 9" | 190 lbs | - |
| Jones, Jeff | RP | Free Agent | 30 | 01/01/2012 | Wilbraham | USA | Left | Right | 6' 0" | 200 lbs | - |
| Jones, Jon | 2B | Clearwater Threshers | 24 | 07/25/2017 | Vallejo | USA | Right | Right | 5' 11" | 180 lbs | - |
| Jones, Tim | SP | Charlotte Stone Crabs | 23 | 10/03/2018 | Hardin | USA | Right | Right | 6' 8" | 200 lbs | - |
| Justice, Ken | RP | Dunedin Blue Jays | 23 | 10/21/2018 | LaPlace | USA | Right | Right | 6' 5" | 185 lbs | - |
