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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| MacBride, Lloyd | CL | Wisconsin Rapids Rangers | 33 | 08/06/1985 | Hamilton | CAN | Left | Left | 6' 2" | 217 lbs | - |
| MacKnight, Tommy | C | Erie Jaxx | 25 | 12/22/1993 | Minneapolis | USA | Left | Right | 6' 0" | 188 lbs | - |
| Maldonado, Alberto | SP | Plumstead Eagles | 22 | 02/22/1996 | Maracaibo | VEN | Left | Left | 6' 3" | 225 lbs | - |
| Manning, Michael | MR | Manhatten Meatheads | 20 | 08/12/1998 | Orlando | USA | Left | Left | 6' 1" | 220 lbs | - |
| Martin, Roland | SP | Manhatten Meatheads | 20 | 06/09/1998 | Cloquet | USA | Right | Right | 6' 2" | 200 lbs | - |
| Martínez, Alfonso | MR | Manhatten Meatheads | 18 | 06/04/2000 | Managua | NCA | Right | Right | 6' 2" | 205 lbs | - |
| Martínez, António | 1B | Erie Jaxx | 23 | 07/09/1995 | Roseville | USA | Right | Right | 6' 4" | 220 lbs | - |
| Martínez, Esteban | 3B | Free Agent | 23 | 02/02/1995 | Havana | CUB | Right | Right | 6' 6" | 180 lbs | - |
| Martínez, Jorge | RF | Columbia 08s | 23 | 01/19/1995 | Belpre | USA | Left | Left | 6' 3" | 215 lbs | - |
| Martínez, Juan | MR | Free Agent | 25 | 08/30/1993 | San Juan | PUR | Left | Left | 6' 3" | 258 lbs | - |
| Martínez, Luis | C | Free Agent | 25 | 08/12/1993 | Bayamón | PUR | Right | Right | 6' 2" | 200 lbs | - |
| Martínez, Ricardo | RF | Bemidji Benders | 23 | 01/02/1995 | New York | USA | Right | Right | 6' 2" | 205 lbs | - |
| Massey, Wayne | CF | Erie Jaxx | 22 | 04/28/1996 | Fairview | USA | Right | Right | 6' 2" | 210 lbs | - |
| Massuthe, Thorsten | SP | Bemidji Benders | 24 | 11/24/1994 | Berlin | GER | Right | Right | 6' 0" | 200 lbs | - |
| Matoza, Roberto | SP | Cincinnati Pride | 23 | 04/05/1995 | Comerío | PUR | Right | Right | 6' 0" | 215 lbs | - |
| Mayfield, Daniel | 2B | Lee's Summit Tigers | 29 | 10/24/1989 | Reno | USA | Left | Right | 5' 11" | 192 lbs | - |
| McDaniel, George | LF | Free Agent | 25 | 02/20/1993 | Phoenix | USA | Right | Left | 5' 8" | 175 lbs | - |
| McDaniel, Greg | RF | Bemidji Benders | 25 | 11/27/1993 | Midvale | USA | Right | Right | 5' 11" | 202 lbs | - |
| McDonald, Tim | MR | Plumstead Eagles | 20 | 01/06/1998 | Lynn | USA | Right | Right | 6' 0" | 220 lbs | - |
| McDowell, Earl | MR | Minnesota Death Stars | 24 | 09/08/1994 | New Brunswick | USA | Left | Right | 6' 5" | 230 lbs | - |
| McGinnity, Matt | SP | Manhatten Meatheads | 20 | 04/22/1998 | Waterville | USA | Right | Right | 5' 11" | 220 lbs | - |
| McIntyre, Travis | MR | Erie Jaxx | 26 | 05/18/1992 | Arlington | USA | Left | Left | 6' 0" | 215 lbs | - |
| McLaughlin, Ronald | C | Wisconsin Rapids Rangers | 25 | 01/23/1993 | Fontana | USA | Right | Right | 6' 2" | 190 lbs | - |
| Medina, Leonardo | LF | Manhatten Meatheads | 19 | 08/06/1999 | Camagüey | CUB | Left | Right | 6' 5" | 215 lbs | $2,830,000 |
| Mejía, Felipe | MR | Lee's Summit Tigers | 23 | 05/29/1995 | Caguas | PUR | Right | Right | 5' 9" | 227 lbs | - |
| Memoto, Nobuhiko | 2B | Free Agent | 20 | 07/16/1998 | Tsuruoka | JPN | Right | Right | 6' 2" | 175 lbs | - |
| Mendoza, Fernando | SS | Manhatten Meatheads | 22 | 04/07/1996 | San Juan | PUR | Right | Right | 6' 0" | 190 lbs | - |
| Mendoza, Jorge | SP | Bemidji Benders | 23 | 10/10/1995 | Farmington Hills | USA | Right | Right | 6' 2" | 240 lbs | - |
| Meyer, Jeremy | MR | Barry's Bay Orioles | 22 | 06/20/1996 | Fox Lake | USA | Left | Left | 6' 1" | 210 lbs | - |
| Michael, Lonnie | MR | Bemidji Benders | 22 | 10/01/1996 | Dayton | USA | Left | Left | 6' 2" | 235 lbs | - |
| Miller, John | 3B | Barry's Bay Orioles | 23 | 04/26/1995 | Antioch | USA | Switch | Right | 5' 9" | 190 lbs | - |
| Mitchell, Jason | LF | Free Agent | 23 | 09/02/1995 | Glenview | USA | Switch | Right | 5' 10" | 180 lbs | - |
| Moore, Bill | SP | Manhatten Meatheads | 21 | 12/01/1997 | Poway | USA | Right | Left | 6' 0" | 205 lbs | - |
| Moore, Kevin | LF | Cincinnati Pride | 24 | 09/11/1994 | Tacoma | USA | Left | Left | 6' 1" | 180 lbs | - |
| Moreno, Ánibal | LF | Free Agent | 22 | 06/04/1996 | Escuinapa | MEX | Left | Left | 6' 0" | 185 lbs | - |
| Moser, Jerry | SS | Free Agent | 22 | 11/26/1996 | Virginia Beach | USA | Switch | Right | 6' 0" | 205 lbs | - |
| Mullins, Stanley | LF | Cincinnati Pride | 20 | 08/08/1998 | Lynn | USA | Left | Left | 6' 2" | 175 lbs | - |
| Muñíz, Augusto | CL | Lee's Summit Tigers | 20 | 12/11/1998 | Santiago | DOM | Right | Right | 6' 6" | 210 lbs | - |
| Muñóz, Bartolo | MR | Plumstead Eagles | 24 | 11/08/1994 | Hondo Valle | DOM | Left | Right | 6' 0" | 205 lbs | - |
| Murphy, David | LF | Manhatten Meatheads | 19 | 02/14/1999 | Livonia | USA | Left | Left | 6' 0" | 205 lbs | - |
