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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackowski, Marcus | SP | Grand Island Islanders | 16 | 12/17/2018 | College Station | USA | Right | Right | 6' 0" | 160 lbs | - |
| Jackson, Dante | CL | Grand Island Islanders | 17 | 10/02/2017 | Ocoee | USA | Left | Left | 5' 10" | 155 lbs | - |
| Jackson, Tyler | RP | Jefferson Indians | 16 | 04/14/2018 | Ridgeland | USA | Right | Right | 6' 2" | 165 lbs | - |
| Jacobson, Mike | RP | Kearny High Cardinals | 16 | 10/12/2018 | Milton | USA | Left | Left | 6' 3" | 175 lbs | - |
| Janney, Jim | SP | Canby Lancers | 16 | 11/18/2018 | New York | USA | Right | Left | 6' 3" | 180 lbs | - |
| Jeffery, Jim | RP | Canby Lancers | 14 | 03/31/2020 | Laval | CAN | Left | Left | 6' 3" | 175 lbs | - |
| Jeffrey, Tim | 2B | San Marin Mustangs | 15 | 03/22/2019 | Richmond | USA | Right | Right | 6' 1" | 170 lbs | - |
| Jensen, Dave | RP | Tenafly Tigers | 16 | 05/15/2018 | Austintown | USA | Right | Right | 6' 2" | 175 lbs | - |
| Jerabek, Kiefer | 1B | Riverside Poly | 16 | 06/27/2018 | Leeds | USA | Right | Right | 6' 5" | 210 lbs | - |
| Jessee, Ben | LF | Montreal Cardinals | 16 | 07/11/2018 | Queens | USA | Right | Right | 6' 5" | 210 lbs | - |
| Jimenez, Hector | RP | Carl Albert Titans | 14 | 04/04/2020 | Las Charcas | DOM | Left | Left | 6' 6" | 185 lbs | - |
| Jimenez, Raul | RP | Downsview Mustangs | 14 | 03/12/2020 | Santo Domingo | DOM | Switch | Right | 6' 0" | 160 lbs | - |
| Jimenez, Victor | SP | Topeka West Chargers | 14 | 04/12/2020 | Conway | USA | Right | Right | 6' 5" | 180 lbs | - |
| Johannesen, Andy | SS | Lerna Lions | 16 | 10/25/2018 | Great Neck | USA | Right | Right | 6' 1" | 160 lbs | - |
| Johnson, Andy | 1B | Kearny High Cardinals | 14 | 01/05/2020 | Chattanooga | USA | Right | Right | 6' 2" | 190 lbs | - |
| Johnson, Jaylin | C | Derby Panthers | 16 | 06/29/2018 | Sachse | USA | Right | Right | 6' 0" | 170 lbs | - |
| Johnson, Josh | SS | Seminole Warhawks | 16 | 01/08/2018 | Highlands Ranch | USA | Right | Right | 6' 2" | 180 lbs | - |
| Johnson, Josh | C | Riverside Poly | 15 | 08/18/2019 | Arlington | USA | Right | Right | 5' 11" | 175 lbs | - |
| Johnson, Randy | 1B | Downsview Mustangs | 15 | 05/10/2019 | Denver | USA | Right | Right | 6' 0" | 185 lbs | - |
| Johnson, Tom | SP | Grand Island Islanders | 18 | 08/29/2016 | Ft. Lauderdale | USA | Left | Left | 6' 2" | 175 lbs | - |
| Jones, Bill | SS | Lerna Lions | 15 | 04/09/2019 | Northglenn | USA | Right | Right | 6' 4" | 175 lbs | - |
| Jones, Jeremy | SP | George Washington Patriots | 15 | 07/19/2019 | Houston | USA | Left | Left | 6' 2" | 165 lbs | - |
| Jones, Nick | LF | Pitman High Panthers | 15 | 07/29/2019 | Lowell | USA | Right | Right | 6' 4" | 195 lbs | - |
| Jones, Vince | RP | Kearny High Cardinals | 15 | 08/01/2019 | Clovis | USA | Right | Right | 6' 5" | 180 lbs | - |
| Joy, Adam | 1B | Enterprise Hornets | 16 | 07/02/2018 | Raynham | USA | Right | Left | 6' 3" | 210 lbs | - |
| Judkins, Jeremy | RP | Jacksonville State Jaguars | 16 | 11/05/2018 | Washington | USA | Right | Left | 6' 4" | 175 lbs | - |
| Jun, In-kwon | RP | Downsview Mustangs | 16 | 09/05/2018 | Seoul | KOR | Left | Left | 5' 9" | 145 lbs | - |
