| 12/31/2018 | ||||||
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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| MacDonald, Michael | 2B | Key West Barracudas | 24 | 02/26/1994 | Redan | USA | Right | Right | 5' 11" | 170 lbs | - |
| Marín, Juan | SP | West Virginia Power | 26 | 05/21/1992 | Evanston | USA | Right | Right | 6' 0" | 200 lbs | - |
| Marsh, Chris | MR | Key West Barracudas | 30 | 11/16/1988 | Buena Park | USA | Right | Right | 6' 2" | 194 lbs | - |
| Martin, Grady | SS | West Virginia Power | 25 | 09/14/1993 | Youngsville | USA | Left | Right | 6' 2" | 213 lbs | - |
| Martínez, Arturo | SP | New Hampshire Fisher Cats | 23 | 04/26/1995 | Sanctórum | MEX | Left | Right | 6' 0" | 240 lbs | - |
| Martínez, Juan | SS | Free Agent | 36 | 06/15/1982 | San Diego | USA | Right | Right | 5' 11" | 183 lbs | - |
| Martínez, Pedro | 3B | Memphis Blues | 25 | 12/15/1993 | Artemisa | CUB | Right | Right | 6' 1" | 190 lbs | - |
| Martínez, Wil | SS | New Hampshire Fisher Cats | 31 | 02/01/1987 | Mansfield | USA | Right | Right | 5' 11" | 215 lbs | - |
| Matos, José | 3B | BlackIron Dragons | 23 | 10/25/1995 | Santiago | DOM | Switch | Right | 5' 10" | 170 lbs | - |
| May, Marc | 1B | Montgomery Biscuits | 26 | 11/11/1992 | San Antonio | USA | Left | Left | 6' 1" | 207 lbs | - |
| McBride, Kel | MR | Free Agent | 33 | 11/02/1985 | Moorpark | USA | Switch | Right | 6' 6" | 212 lbs | - |
| McBride, Ryan | 1B | Gainesville Guidos | 23 | 11/19/1995 | Phoenix | USA | Right | Right | 6' 2" | 195 lbs | - |
| McIndoe, Luke | C | West Palm Reds | 26 | 02/02/1992 | Raeford | USA | Right | Right | 6' 0" | 195 lbs | - |
| McNeill, Ray | MR | New Hampshire Fisher Cats | 29 | 02/07/1989 | Petersburg | USA | Left | Left | 6' 5" | 223 lbs | - |
| Medina, Rafael | SP | Montgomery Biscuits | 23 | 05/12/1995 | Maracay | VEN | Right | Right | 5' 10" | 235 lbs | - |
| Medina, Salvador | SP | Wichita Wranglers | 28 | 04/26/1990 | Santo Domingo | DOM | Right | Right | 6' 0" | 207 lbs | - |
| Medrano, Manuel | MR | West Virginia Power | 30 | 06/10/1988 | Acapulco | MEX | Right | Right | 6' 3" | 210 lbs | - |
| Mejía, Manny | CF | West Virginia Power | 25 | 02/03/1993 | El Estor | GUA | Left | Left | 6' 2" | 180 lbs | - |
| Menéndez, Ángel | 3B | Montgomery Biscuits | 23 | 02/27/1995 | Valencia | VEN | Left | Right | 6' 1" | 200 lbs | - |
| Miller, Blake | C | Key West Barracudas | 28 | 01/13/1990 | Portland | USA | Right | Right | 6' 1" | 192 lbs | - |
| Miller, Mark | MR | Key West Barracudas | 30 | 02/03/1988 | Rowland Heights | USA | Left | Left | 6' 7" | 212 lbs | - |
| Miller, Paul | 1B | New Hampshire Fisher Cats | 34 | 11/24/1984 | San Sebastian | PUR | Right | Left | 5' 10" | 188 lbs | - |
| Miller, Tim | CL | Wichita Wranglers | 21 | 11/12/1997 | Columbus | USA | Right | Left | 6' 6" | 240 lbs | - |
| Milley, Carl | SS | Montgomery Biscuits | 24 | 07/09/1994 | Hobart | AUS | Right | Right | 6' 1" | 150 lbs | - |
| Miranda, Gabriel | 3B | Montgomery Biscuits | 21 | 10/12/1997 | Managua | NCA | Right | Right | 6' 0" | 180 lbs | - |
| Mitchell, Trevor | 1B | West Palm Reds | 32 | 07/04/1986 | West Palm Beach | USA | Left | Left | 6' 3" | 214 lbs | - |
| Montero, Salvador | RF | Montgomery Biscuits | 29 | 08/22/1989 | San Martín | ARG | Right | Right | 6' 4" | 209 lbs | - |
| Montoya, Manny | 3B | Montgomery Biscuits | 25 | 06/30/1993 | Río Verde Arriba | DOM | Right | Right | 6' 0" | 185 lbs | - |
| Morales, Carlos | MR | Free Agent | 30 | 10/02/1988 | Zacatelco | MEX | Right | Right | 5' 9" | 202 lbs | - |
| Morales, José | LF | Santa Fe Diablos | 29 | 12/27/1989 | Sibanicú | CUB | Left | Right | 6' 5" | 193 lbs | - |
| Morán, Fernando | 3B | Free Agent | 31 | 12/02/1987 | Santiago | CHI | Left | Right | 6' 0" | 200 lbs | - |
| Morín, Norberto | MR | Free Agent | 32 | 09/21/1986 | East Brunswick | USA | Right | Left | 6' 3" | 207 lbs | - |
| Morkam, Francis | MR | BlackIron Dragons | 35 | 11/26/1983 | Kingston | JAM | Left | Left | 5' 11" | 188 lbs | - |
| Muñóz, Enrique | CL | West Palm Reds | 23 | 09/26/1995 | Santo Domingo | DOM | Left | Left | 6' 4" | 195 lbs | - |
| Muñóz, Mario | 2B | West Virginia Power | 21 | 06/05/1997 | Cancún | MEX | Right | Right | 6' 3" | 185 lbs | - |
