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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Janssen, Lex | RP | Irving Blue Sox | 28 | 01/28/2014 | Princess Quarter | SIM | Left | Left | 6' 5" | 210 lbs | $280,000 |
| Jiménez, José | SP | Bethesda Atoms | 21 | 06/29/2021 | Santo Domingo | DOM | Right | Right | 6' 7" | 210 lbs | - |
| Jiménez, Rodrigo | LF | Yakima Hops | 23 | 01/16/2019 | Rubio | VEN | Right | Right | 6' 4" | 195 lbs | - |
| Jobse, Ger | SS | Barton Springs Blues | 27 | 12/24/2015 | Willemstad | CUR | Right | Right | 5' 11" | 185 lbs | $280,000 |
| Johnson, Edward | CF | Billings Polar Bears | 25 | 05/22/2017 | Davenport | USA | Right | Right | 6' 0" | 200 lbs | - |
| Johnson, Kelly | C | Billings Polar Bears | 24 | 06/15/2018 | Seymour | USA | Right | Right | 6' 1" | 195 lbs | - |
| Johnston, George | RF | Billings Polar Bears | 23 | 02/28/2019 | Mesa | USA | Right | Left | 6' 7" | 225 lbs | - |
| Johnston, Ralph | RP | Bethesda Atoms | 28 | 09/09/2014 | Burnsville | USA | Right | Right | 6' 7" | 250 lbs | - |
| Jones, Derrick | RP | Minnesota Loons | 23 | 01/26/2019 | Hemet | USA | Left | Left | 6' 1" | 175 lbs | - |
| Joo, Tso-i | C | Minnesota Loons | 22 | 01/26/2020 | Tainan | TPE | Right | Right | 6' 3" | 215 lbs | - |
| Joseph, John | 1B | Yakima Hops | 24 | 08/28/2018 | Athol | USA | Switch | Right | 6' 2" | 220 lbs | - |
| Joseph, King | SP | Irving Blue Sox | 21 | 09/06/2021 | Foothill Farms | USA | Right | Right | 6' 2" | 185 lbs | - |
| Juderías, Tony | 2B | Richland Rails | 26 | 08/23/2016 | San Antonio | CHI | Right | Right | 6' 3" | 210 lbs | - |
