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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackson, Lindsay | 2B | Free Agent | 32 | 09/08/2002 | La Crosse | USA | Right | Right | 6' 0" | 200 lbs | - |
| Jackson, Lou | C | Seattle Pilots | 25 | 11/15/2009 | Los Angeles | USA | Right | Right | 6' 2" | 215 lbs | $300,000 |
| James, Jeffery | 3B | Rochester Redbirds | 32 | 03/30/2002 | Ocala | USA | Right | Right | 6' 3" | 210 lbs | - |
| Jareño, Carlos | LF | Chicago Whales | 27 | 04/22/2007 | Unknown | MEX | Right | Right | 6' 2" | 200 lbs | $1,040,000 |
| Jenkins, Brad | RP | Chicago Whales | 25 | 01/15/2010 | Bakersfield | USA | Right | Right | 6' 5" | 225 lbs | $300,000 |
| Jiménez, Víctor | SP | Seattle Pilots | 17 | 07/29/2017 | Pinar del Rio | CUB | Right | Right | 6' 0" | 165 lbs | - |
| Johnson, Charlie | RF | Seattle Pilots | 30 | 09/10/2004 | Los Angeles | USA | Left | Right | 6' 2" | 210 lbs | $530,000 |
| Johnson, Clinton | RP | Cleveland Spiders | 25 | 09/27/2009 | Indianapolis | USA | Left | Left | 6' 2" | 210 lbs | $300,000 |
| Johnson, Donald | C | Free Agent | 34 | 06/08/2000 | Albany | USA | Right | Right | 6' 4" | 250 lbs | - |
| Johnson, Rick | SP | Seattle Pilots | 31 | 11/04/2003 | Archer City | USA | Left | Left | 6' 3" | 230 lbs | $494,000 |
| Johnson, Wes | RP | Chicago Whales | 27 | 11/05/2007 | San Diego | USA | Right | Right | 5' 11" | 190 lbs | $520,000 |
| Johnston, Denny | RP | Chicago Whales | 26 | 02/03/2008 | Clearwater | USA | Right | Right | 6' 0" | 195 lbs | $1,100,000 |
| Johnston, Tim | SP | Seattle Pilots | 30 | 10/15/2004 | Hermiston | USA | Left | Right | 6' 0" | 195 lbs | $16,800,000 |
| Jones, Jason | C | Miami X Giants | 27 | 03/03/2007 | Wonder Lake | USA | Right | Right | 5' 10" | 205 lbs | $300,000 |
| Jones, Mike | LF | Brooklyn Superbas | 32 | 05/15/2002 | Edina | USA | Right | Right | 5' 9" | 260 lbs | $22,400,000 |
| Joo, Yu-wei | SP | Cleveland Spiders | 17 | 04/17/2017 | Altay | CHN | Right | Left | 6' 0" | 165 lbs | - |
