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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| Mabbett, Mason | LF | Reading Rainbows | 22 | 01/29/1996 | Southbridge | USA | Left | Right | 6' 4" | 185 lbs | - |
| Madrid, Edgardo | C | Butler White Sox | 23 | 07/10/1995 | San Juan | PUR | Right | Right | 6' 4" | 195 lbs | - |
| Manning, Jonathan | MR | Free Agent | 24 | 05/04/1994 | Houston | USA | Right | Right | 6' 0" | 220 lbs | - |
| Manuel, Tomás | 1B | Mt Pleasant Bearcats | 33 | 02/24/1985 | White Sulphur Springs | USA | Right | Right | 6' 1" | 206 lbs | - |
| Márquez, Jorge | SS | Lima Oilers | 23 | 11/19/1995 | Cedar Park | USA | Right | Right | 6' 0" | 155 lbs | - |
| Martínez, Aurelio | SP | Newark Bulldogs | 26 | 02/24/1992 | Raleigh | USA | Right | Right | 6' 7" | 215 lbs | - |
| Martínez, Gilberto | MR | Newark Bulldogs | 24 | 03/17/1994 | Lzpez Mateos | MEX | Right | Right | 6' 6" | 230 lbs | - |
| Massarelli, Angelo | RF | Lima Oilers | 28 | 03/23/1990 | Acireale | ITA | Right | Right | 6' 1" | 207 lbs | - |
| Matos, Rubén | C | Newark Bulldogs | 24 | 05/16/1994 | San José de Ocoa | DOM | Right | Right | 6' 1" | 215 lbs | - |
| Matthews, Shawn | SS | Springfield Simpsons | 25 | 12/04/1993 | Brooklyn | USA | Right | Right | 5' 7" | 180 lbs | - |
| McGinley, Albert | MR | Buffalo LightSabres | 25 | 11/17/1993 | Brooklyn | USA | Right | Right | 6' 8" | 220 lbs | - |
| McKinnon, Wyatt | 3B | Reading Rainbows | 20 | 05/05/1998 | Coeur dAlene | USA | Right | Right | 6' 2" | 185 lbs | - |
| McQueen, Lonnie | MR | Reading Rainbows | 24 | 12/13/1994 | Laurel | USA | Right | Right | 6' 7" | 220 lbs | - |
| Medina, Juan | 3B | Butler White Sox | 23 | 02/09/1995 | The Bronx | USA | Left | Right | 6' 0" | 185 lbs | - |
| Mendoza, Felipe | 2B | Lima Oilers | 24 | 05/24/1994 | Camagüey | CUB | Right | Right | 6' 0" | 200 lbs | - |
| Merrit, Nick | CL | Reading Rainbows | 24 | 05/18/1994 | Lac-Lapierre | CAN | Left | Left | 6' 3" | 207 lbs | - |
| Meyer, Roger | 1B | Free Agent | 30 | 12/12/1988 | Fairway | USA | Right | Right | 6' 1" | 223 lbs | - |
| Miller, Chris | 3B | Mt Pleasant Bearcats | 32 | 02/01/1986 | Indianapolis | USA | Switch | Right | 6' 0" | 222 lbs | - |
| Moore, Howard | LF | Springfield Simpsons | 24 | 01/19/1994 | Avalon | USA | Right | Left | 6' 1" | 225 lbs | - |
| Moore, Wilford | 2B | Mt Pleasant Bearcats | 34 | 10/07/1984 | Center Point | USA | Right | Right | 6' 0" | 180 lbs | - |
| Mora, Leonel | SS | Buffalo LightSabres | 22 | 03/06/1996 | Santo Domingo | DOM | Right | Right | 6' 0" | 170 lbs | - |
| Morales, Juan | MR | Wilmington Rebels | 24 | 05/29/1994 | Panama | PAN | Right | Right | 5' 9" | 220 lbs | - |
| Morales, Pedro | C | Free Agent | 34 | 09/26/1984 | Matanzas | CUB | Switch | Right | 5' 10" | 192 lbs | - |
| Morales, Ramón | CF | Springfield Simpsons | 24 | 08/30/1994 | San Cristóbal | DOM | Right | Right | 6' 1" | 185 lbs | - |
| Morán, Juan | SP | Mt Pleasant Bearcats | 28 | 02/03/1990 | Ciales | PUR | Right | Right | 6' 1" | 207 lbs | - |
| Morán, Pablo | SS | Mt Pleasant Bearcats | 24 | 12/28/1994 | Puerto Peñasco | MEX | Right | Right | 6' 2" | 215 lbs | - |
| Morgan, Oliver | SS | Lima Oilers | 27 | 09/21/1991 | Chicago | USA | Right | Right | 5' 10" | 199 lbs | - |
| Morita, Kenko | MR | Springfield Simpsons | 24 | 05/05/1994 | Yokohama | JPN | Left | Left | 6' 3" | 208 lbs | - |
| Mosley, Joe | CF | Mt Pleasant Bearcats | 33 | 01/17/1985 | Ashwaubenon | USA | Right | Left | 6' 3" | 186 lbs | - |
| Muñíz, Paco | 3B | Wilmington Rebels | 29 | 01/24/1989 | Maracay | VEN | Right | Right | 6' 0" | 191 lbs | - |
| Muñóz, José | 1B | Buffalo LightSabres | 27 | 10/02/1991 | Cayey | PUR | Switch | Right | 5' 10" | 197 lbs | - |
| Murayama, Kenji | 3B | Newark Bulldogs | 23 | 06/12/1995 | Owariashi | JPN | Right | Right | 6' 2" | 186 lbs | - |
| Murphy, Desi | SS | Springfield Simpsons | 28 | 01/22/1990 | Ashland | USA | Right | Right | 6' 1" | 202 lbs | - |
| Murphy, Jimmy | SS | Mt Pleasant Bearcats | 37 | 03/01/1981 | San Jose | USA | Right | Right | 6' 0" | 203 lbs | - |
| Myers, Ray | LF | Free Agent | 31 | 10/31/1987 | Westmont | USA | Right | Right | 6' 1" | 187 lbs | - |
