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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackson, Don | RP | Beloit Snappers | 27 | 10/28/2014 | Lincroft | USA | Right | Right | 6' 8" | 205 lbs | - |
| Jackson, Ken | 3B | Free Agent | 29 | 05/28/2013 | Rowland Heights | USA | Right | Right | 6' 3" | 200 lbs | - |
| Jarvis, Jerry | CF | West Michigan Whitecaps | 25 | 11/12/2016 | Virginia Beach | USA | Right | Right | 6' 0" | 190 lbs | - |
| Jefferson, Jimmy | CL | Fort Wayne TinCaps | 25 | 06/01/2017 | Coventry | USA | Left | Left | 6' 4" | 200 lbs | - |
| Jenkins, Mike | RF | Dayton Dragons | 20 | 08/27/2021 | Rochester | USA | Left | Left | 6' 7" | 190 lbs | - |
| Jenkins, Steve | SP | Lansing Lugnuts | 24 | 08/09/2017 | Winooski | USA | Right | Right | 5' 11" | 170 lbs | - |
| Jennings, Ken | RP | South Bend Cubs | 21 | 10/05/2020 | Toronto | CAN | Left | Left | 6' 6" | 200 lbs | - |
| Johnson, Bobby | RP | Cedar Rapids Kernels | 23 | 09/06/2018 | St. Louis | USA | Right | Right | 6' 2" | 200 lbs | - |
| Johnson, Chris | RP | Beloit Snappers | 25 | 06/09/2017 | Town 'n' Country | USA | Right | Right | 6' 4" | 200 lbs | - |
| Johnson, Max | RP | Cedar Rapids Kernels | 25 | 05/27/2017 | San Antonio | USA | Right | Right | 6' 4" | 200 lbs | - |
| Jones, Cal | RP | Beloit Snappers | 24 | 11/23/2017 | Bloomington | USA | Right | Right | 6' 4" | 200 lbs | - |
| Jones, Derek | C | Lansing Lugnuts | 23 | 11/02/2018 | Sioux Falls | USA | Right | Right | 6' 4" | 210 lbs | - |
| Jones, Jake | RP | South Bend Cubs | 23 | 03/30/2019 | Leawood | USA | Left | Right | 5' 10" | 170 lbs | - |
| Jones, Ron | SS | West Michigan Whitecaps | 30 | 11/29/2011 | Columbus | USA | Right | Right | 6' 2" | 200 lbs | - |
| Jones, Wally | SS | Lansing Lugnuts | 23 | 07/27/2018 | Palm Valley | USA | Right | Right | 6' 1" | 190 lbs | - |
| Jonne, Lineu | CF | Great Lakes Loons | 23 | 12/07/2018 | Maracaibo | VEN | Right | Right | 6' 4" | 200 lbs | - |
| Jordan, Brad | RP | South Bend Cubs | 24 | 02/04/2018 | Town 'n' Country | USA | Left | Right | 6' 2" | 190 lbs | - |
| Joseph, Joe | RP | Lake County Captains | 26 | 07/10/2015 | Madisonville | USA | Left | Left | 5' 10" | 195 lbs | - |
| Juárez, Jesús | RP | Lansing Lugnuts | 23 | 03/08/2019 | Coro | VEN | Right | Right | 6' 2" | 185 lbs | - |
