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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| Jackson, Ed | LF | Free Agent | 31 | 02/17/1987 | Simonton Lake | USA | Left | Left | 5' 9" | 196 lbs | - |
| Jackson, Eddie | RF | New York Knights | 28 | 07/28/1990 | New York | USA | Right | Right | 6' 1" | 222 lbs | - |
| Jackson, Jarred | RF | Baffin Island Beavers | 26 | 04/11/1992 | Nutley | USA | Left | Left | 6' 1" | 200 lbs | $2,300,000 |
| Jackson, Jason | 2B | San Francisco Bandits | 34 | 07/05/1984 | Killeen | USA | Right | Right | 6' 0" | 183 lbs | $11,610,000 |
| Jackson, Larry | MR | Cleveland Monsters | 31 | 08/13/1987 | Lakewood | USA | Right | Right | 6' 0" | 203 lbs | $950,000 |
| Jackson, Larry | CF | Free Agent | 31 | 11/21/1987 | Clarkston | USA | Right | Right | 6' 1" | 196 lbs | - |
| Jacobson, Tom | SS | Indianapolis Lions | 30 | 03/25/1988 | Westborough | USA | Right | Right | 6' 3" | 223 lbs | $1,250,000 |
| James, Brody | SP | Greenville 84s | 24 | 09/08/1994 | Fajardo | PUR | Left | Left | 6' 5" | 255 lbs | $1,000,000 |
| James, Sloan | C | St. Louis Browns | 27 | 11/11/1991 | Northfield | USA | Switch | Right | 6' 0" | 209 lbs | - |
| James, Todd | RF | Free Agent | 29 | 08/01/1989 | Detroit | USA | Left | Left | 6' 1" | 213 lbs | - |
| Jefferson, Lewis | CL | Chicago Machine | 39 | 12/26/1979 | Havelock | USA | Left | Right | 5' 11" | 191 lbs | $3,000,000 |
| Jennings, Steven | SS | Free Agent | 30 | 01/28/1988 | Buffalo | USA | Right | Right | 6' 1" | 178 lbs | - |
| Jijón, Ernesto | CL | San Francisco Bandits | 34 | 09/03/1984 | Portland | USA | Right | Right | 6' 2" | 221 lbs | $6,740,000 |
| Jiménez, Alonso | MR | Niagara Falls Frenzy | 30 | 02/25/1988 | Manhattan | USA | Right | Right | 5' 11" | 220 lbs | $1,200,000 |
| Jiménez, Carlos | 2B | Los Cabos Cartel | 23 | 06/08/1995 | Bonao | DOM | Right | Right | 5' 11" | 180 lbs | $400,000 |
| Jiménez, Estefan | MR | Los Cabos Cartel | 31 | 06/25/1987 | Guarne | COL | Right | Right | 5' 11" | 199 lbs | $3,500,000 |
| Jiménez, Ramiro | SP | Los Angeles Bruins | 22 | 06/07/1996 | Santo Domingo | DOM | Left | Left | 6' 1" | 230 lbs | $5,000,000 |
| Johnston, Dave | LF | Austin River Sharks | 25 | 06/13/1993 | Pasadena | USA | Right | Right | 6' 3" | 225 lbs | - |
| Johnston, Elliott | 1B | Cleveland Monsters | 27 | 09/25/1991 | Bloomington | USA | Right | Right | 6' 0" | 215 lbs | $400,000 |
| Johnstone, David | 3B | Hendersonville Hitmen | 23 | 04/25/1995 | Bowie | USA | Switch | Right | 5' 11" | 195 lbs | $400,000 |
| Jones, Jacob | MR | Seattle Pikes | 37 | 12/28/1981 | Catalina Foothills | USA | Switch | Right | 6' 0" | 177 lbs | $4,200,000 |
| Jones, Max | MR | Free Agent | 33 | 10/31/1985 | Coram | USA | Left | Left | 6' 1" | 186 lbs | - |
| Jones, Pat | RF | Maui Tropics | 26 | 11/10/1992 | Summit | USA | Left | Left | 6' 2" | 205 lbs | $400,000 |
| Joo, Ching | SP | New York Knights | 22 | 03/08/1996 | Tainan | TPE | Left | Right | 6' 2" | 190 lbs | $750,000 |
| Jordan, Eddie | LF | Reno Cards | 30 | 05/27/1988 | Charlotte | USA | Left | Left | 6' 2" | 213 lbs | $400,000 |
| Juárez, António | CL | St Charles Sheens | 28 | 03/10/1990 | Dulce Nombre | CRC | Switch | Right | 6' 1" | 215 lbs | $6,250,000 |
| Juárez, Esteban | CL | Niagara Falls Frenzy | 24 | 03/11/1994 | Santa Cruz de Rosales | MEX | Left | Right | 6' 7" | 195 lbs | $400,000 |
