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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| Ma, Chang-lit | LF | Free Agent | 28 | 10/22/1990 | Taipei | TPE | Left | Left | 6' 1" | 204 lbs | - |
| MacGruder, Dave | MR | Free Agent | 24 | 03/06/1994 | Escondido | USA | Right | Right | 5' 9" | 180 lbs | - |
| Maez, José | MR | Free Agent | 32 | 01/05/1986 | Vallejo | USA | Right | Right | 5' 7" | 182 lbs | - |
| Major, Bud | LF | Riverside Red Bulls | 22 | 10/06/1996 | Long Beach | USA | Right | Right | 5' 10" | 200 lbs | - |
| Maloney, Terry | LF | Red Deer Wranglers | 20 | 09/08/1998 | Halifax | CAN | Left | Left | 5' 11" | 180 lbs | - |
| Mark, Bill | SS | La Crosse Loggers | 20 | 06/23/1998 | Joshua | USA | Right | Right | 5' 10" | 210 lbs | - |
| Martin, Ronnie | 1B | Culver City Extras | 25 | 01/11/1993 | Dennis Port | USA | Left | Left | 6' 0" | 210 lbs | - |
| Martínez, Carlos | MR | Free Agent | 30 | 09/30/1988 | Mexico City | MEX | Left | Right | 6' 5" | 220 lbs | - |
| Martínez, Edgardo | SP | Bismark Border Guards | 23 | 10/10/1995 | Puerto Cabezas | NCA | Right | Right | 6' 1" | 210 lbs | - |
| Martínez, Félix | MR | San Diego Smashers | 25 | 12/07/1993 | Norwalk | USA | Left | Left | 6' 1" | 193 lbs | - |
| Martínez, Jorge | 2B | Free Agent | 29 | 08/14/1989 | Havana | CUB | Right | Right | 6' 3" | 227 lbs | - |
| Martínez, Jorge | 3B | Free Agent | 30 | 04/26/1988 | Querétaro | MEX | Right | Right | 6' 0" | 211 lbs | - |
| Martínez, José | CF | Free Agent | 32 | 06/28/1986 | San Francisco de Macorís | DOM | Right | Right | 6' 0" | 182 lbs | - |
| Martínez, Júlio | MR | Moose Jaw Ghostbusters | 24 | 10/08/1994 | San José de Guanipa | VEN | Right | Right | 6' 0" | 205 lbs | - |
| Martínez, Pedro | SP | San Diego Smashers | 23 | 02/08/1995 | Rincón | DOM | Right | Right | 6' 1" | 245 lbs | - |
| Martínez, Quinton | SS | La Crosse Loggers | 25 | 10/24/1993 | Omaha | USA | Right | Right | 6' 2" | 200 lbs | - |
| Mathews, Teddy | MR | Balzac Rams | 23 | 10/13/1995 | New York | USA | Right | Right | 5' 9" | 205 lbs | - |
| Matos, Domingo | 1B | Menlo Maniacs | 22 | 06/06/1996 | Dearborn | USA | Right | Right | 6' 2" | 190 lbs | - |
| McCain, Jonathan | SP | San Diego Smashers | 24 | 10/23/1994 | North Yelm | USA | Right | Right | 6' 0" | 225 lbs | - |
| McDonald, Michael | 1B | La Crosse Loggers | 21 | 12/24/1997 | Naguabo | PUR | Switch | Right | 6' 2" | 235 lbs | - |
| McDonald, Ray | RF | Red Deer Wranglers | 27 | 08/02/1991 | Hanover Township | USA | Right | Right | 6' 3" | 220 lbs | - |
| McGee, Mike | MR | Free Agent | 22 | 07/02/1996 | Fresno | USA | Left | Left | 6' 0" | 200 lbs | - |
| McKinney, Nathan | 2B | Culver City Extras | 25 | 07/02/1993 | Denver | USA | Switch | Right | 6' 4" | 200 lbs | - |
| McLeod, Dan | SP | Free Agent | 32 | 07/06/1986 | Wilmington | USA | Left | Left | 5' 11" | 219 lbs | - |
| Medina, Eduardo | MR | Free Agent | 24 | 01/27/1994 | Tempe | USA | Switch | Right | 5' 7" | 220 lbs | - |
| Medro, Mario | C | Red Deer Wranglers | 30 | 12/28/1988 | San Salvador | SLV | Right | Right | 6' 0" | 201 lbs | - |
| Melanson, Ray | C | Riverside Red Bulls | 32 | 03/22/1986 | Toronto | CAN | Right | Right | 5' 11" | 200 lbs | - |
| Memoto, Masaaki | LF | Balzac Rams | 27 | 06/23/1991 | Yokohama | JPN | Right | Right | 6' 1" | 185 lbs | - |
| Méndez, Armando | SS | San Diego Smashers | 24 | 05/05/1994 | Baltimore | USA | Right | Right | 6' 1" | 200 lbs | - |
| Mesa, Roberto | RF | La Crosse Loggers | 25 | 07/22/1993 | Lower Merion | USA | Right | Right | 6' 1" | 213 lbs | - |
| Mifune, Takehide | MR | Free Agent | 31 | 11/09/1987 | Chichibu | JPN | Right | Right | 6' 2" | 221 lbs | - |
| Miller, Brandon | CF | Riverside Red Bulls | 25 | 03/27/1993 | Hampton | USA | Right | Left | 6' 1" | 192 lbs | - |
| Miller, Dan | MR | Menlo Maniacs | 28 | 01/19/1990 | Moultrie | USA | Right | Right | 6' 2" | 217 lbs | - |
| Miller, Ken | RF | Menlo Maniacs | 23 | 08/27/1995 | Brooklyn | USA | Left | Left | 6' 0" | 170 lbs | - |
| Minardi, Benito | 2B | Oakland Giants | 22 | 09/10/1996 | Petare | VEN | Right | Right | 6' 0" | 195 lbs | - |
| Miners, Drew | MR | La Crosse Loggers | 27 | 04/24/1991 | Sydney | AUS | Right | Left | 5' 11" | 200 lbs | - |
| Miranda, Cipriano | 3B | Culver City Extras | 25 | 06/11/1993 | Fairmount | USA | Left | Right | 6' 0" | 205 lbs | - |
| Montoya, David | SP | San Diego Smashers | 24 | 07/05/1994 | North Wilkesboro | USA | Left | Left | 6' 1" | 240 lbs | - |
| Montoya, Marcos | MR | Free Agent | 24 | 02/23/1994 | Santo Domingo | DOM | Left | Left | 6' 2" | 215 lbs | - |
| Moore, Malcolm | SP | Culver City Extras | 24 | 01/10/1994 | Douglas | USA | Left | Left | 6' 7" | 235 lbs | - |
| Morán, Miguel | 3B | Balzac Rams | 33 | 05/13/1985 | Twentynine Palms | USA | Right | Right | 6' 0" | 208 lbs | - |
| Morgan, Sean | C | Balzac Rams | 23 | 03/18/1995 | Honolulu | USA | Right | Right | 6' 0" | 205 lbs | - |
| Moser, Jesse | MR | Bismark Border Guards | 24 | 04/14/1994 | Buffalo | USA | Right | Right | 6' 1" | 215 lbs | - |
| Muñíz, Carlos | MR | Oakland Giants | 30 | 12/04/1988 | Collierville | USA | Right | Right | 6' 1" | 228 lbs | - |
| Muñóz, Javier | 3B | Free Agent | 32 | 12/24/1986 | Santo Domingo | DOM | Right | Right | 6' 2" | 217 lbs | - |
| Murakami, Norogumi | LF | Riverside Red Bulls | 23 | 03/27/1995 | Kagoshima | JPN | Right | Left | 6' 2" | 210 lbs | - |
| Murgatroyd, Carl | CL | Menlo Maniacs | 28 | 11/27/1990 | Nassau | BAH | Right | Right | 6' 2" | 220 lbs | - |
| Murray, Foster | SS | Red Deer Wranglers | 25 | 03/17/1993 | Port Arthur | USA | Right | Right | 5' 11" | 200 lbs | - |
| Murray, Pete | MR | Free Agent | 25 | 04/24/1993 | Dublin | USA | Right | Right | 6' 0" | 210 lbs | - |
