| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| MacAldonich, Jared | SS | Free Agent | 27 | 09/13/1988 | Pomona | USA | Right | Right | 6' 0" | 183 lbs | - |
| MacDonald, Shawn | MR | New York Ninjas | 27 | 02/10/1988 | East Los Angeles | USA | Right | Right | 5' 10" | 200 lbs | - |
| MacGregor, Barney | 3B | Long Island Ducks | 23 | 09/25/1992 | Philadelphia | USA | Switch | Right | 6' 1" | 205 lbs | - |
| Machado, Héctor | 2B | Free Agent | 26 | 11/10/1989 | Gladstone | USA | Right | Right | 6' 1" | 190 lbs | - |
| Macías, Claudio | MR | Cincinnati Snaps | 23 | 02/10/1992 | Louisville | USA | Left | Left | 6' 0" | 214 lbs | - |
| MacPherson, Terence | MR | Free Agent | 22 | 02/19/1993 | Panama City Beach | USA | Left | Left | 6' 3" | 245 lbs | - |
| Maekawa, Shoin | SP | Prussian Marxists | 24 | 05/04/1991 | Odawara | JPN | Left | Left | 6' 4" | 200 lbs | - |
| Magana, José | MR | Madison Beehive | 23 | 02/14/1992 | San Pablo de las Salinas | MEX | Left | Left | 6' 2" | 215 lbs | - |
| Mak, Yuan | CL | San Antonio Storm Troopers | 20 | 03/21/1995 | Kaohsiung | TPE | Left | Left | 6' 4" | 225 lbs | - |
| Makaev, Badry | LF | Jacksonville Hellcats | 22 | 08/28/1993 | Troy | USA | Right | Right | 6' 2" | 200 lbs | - |
| Manning, Doug | CF | Carson City Mustang | 22 | 08/31/1993 | Pratt | USA | Left | Left | 5' 11" | 205 lbs | - |
| Márquez, Albert | RF | Free Agent | 27 | 01/02/1988 | Suisun City | USA | Left | Left | 6' 2" | 203 lbs | - |
| Márquez, Edgar | MR | Wichita Wolverines | 20 | 03/24/1995 | Guadalajara | MEX | Left | Left | 5' 10" | 240 lbs | - |
| Marsh, Blake | 2B | Free Agent | 27 | 10/03/1988 | Owatonna | USA | Switch | Right | 6' 0" | 185 lbs | - |
| Marshall, David | 1B | Free Agent | 27 | 11/04/1988 | El Paso | USA | Right | Right | 6' 1" | 181 lbs | - |
| Marte, Armando | SP | Murfreesboro Deacons | 21 | 02/10/1994 | Guaynabo | PUR | Right | Left | 6' 1" | 205 lbs | - |
| Martin, Ben | MR | Ottawa Outlaws | 27 | 05/30/1988 | Vacaville | USA | Right | Right | 5' 8" | 190 lbs | - |
| Martin, David | SP | Ottawa Outlaws | 26 | 12/30/1989 | Suffolk | USA | Right | Right | 6' 2" | 195 lbs | - |
| Martin, Eli | MR | Free Agent | 26 | 04/10/1989 | Gaffney | USA | Right | Right | 6' 2" | 225 lbs | - |
| Martin, Jonathan | SP | Sandy Springs Spartans | 22 | 10/29/1993 | Wylie | USA | Left | Right | 6' 1" | 205 lbs | - |
| Martin, Luc | CF | Blackpool Gamblers | 24 | 07/27/1991 | Granby | CAN | Left | Left | 6' 0" | 185 lbs | - |
| Martin, Stephen | C | Grand Haven Whitecaps | 22 | 10/10/1993 | Rushford | USA | Right | Right | 5' 9" | 195 lbs | - |
| Martin, Tommy | MR | Free Agent | 23 | 11/01/1992 | Bourne | USA | Left | Left | 5' 10" | 210 lbs | - |
| Martin, Walter | CF | New York Ninjas | 24 | 01/08/1991 | Allen | USA | Right | Left | 6' 4" | 150 lbs | - |
| Martínez, Felipe | CF | Asheville Tourists | 20 | 12/03/1995 | Barcelona | VEN | Switch | Right | 5' 11" | 175 lbs | - |
| Martínez, Héctor | 2B | Murfreesboro Deacons | 25 | 02/13/1990 | Chalco | MEX | Right | Right | 5' 10" | 200 lbs | - |
| Martínez, Manny | 2B | Rock River Rats | 21 | 09/16/1994 | David | PAN | Right | Right | 6' 1" | 180 lbs | - |
| Martínez, Pedro | MR | Spokane Bulldogs | 20 | 12/01/1995 | Punto Fijo | VEN | Right | Right | 6' 2" | 185 lbs | - |
| Maryadi, Setia | C | Free Agent | 27 | 12/10/1988 | Novato | USA | Right | Right | 5' 11" | 190 lbs | - |
| Mason, Lance | MR | Lake of the Isles Wolves | 24 | 08/21/1991 | Merrimack | USA | Right | Right | 6' 1" | 220 lbs | - |
| Mason, Wendell | 2B | New York Ninjas | 28 | 04/10/1987 | Iuka | USA | Right | Right | 6' 1" | 212 lbs | - |
| Mastroianni, Joël | SP | New York Ninjas | 23 | 01/18/1992 | Maracaibo | VEN | Right | Right | 6' 3" | 205 lbs | - |
| Mata, José Carlos | LF | Anniston Cougars | 20 | 06/19/1995 | Los Reyes | MEX | Left | Left | 6' 1" | 200 lbs | - |
| Mateo, Pablo | MR | Grand Haven Whitecaps | 22 | 04/22/1993 | Pleasant Grove | USA | Left | Left | 6' 2" | 225 lbs | - |
| Matsui, Katsumoto | 3B | Madison Beehive | 19 | 02/25/1996 | Osaka | JPN | Left | Right | 5' 9" | 200 lbs | - |
| Matsumoto, Hirokazu | RF | Long Island Ducks | 24 | 02/18/1991 | Murayama | JPN | Left | Left | 6' 1" | 215 lbs | - |
| Matthews, Paul | MR | Free Agent | 27 | 02/03/1988 | Raleigh | USA | Switch | Right | 6' 0" | 169 lbs | - |
| Mauldin, Cecil | C | Rock River Rats | 24 | 06/15/1991 | Deerfield Beach | USA | Left | Right | 6' 2" | 175 lbs | - |
| McAllister, Bob | MR | Blackpool Gamblers | 22 | 07/27/1993 | Stratmoor | USA | Right | Right | 6' 2" | 220 lbs | - |
| McBride, Nick | RF | Carson City Mustang | 23 | 10/07/1992 | Clarksville | USA | Left | Left | 5' 10" | 190 lbs | - |
| McCann, Peter | SP | Free Agent | 28 | 08/19/1987 | Virginia Beach | USA | Right | Right | 5' 10" | 208 lbs | - |
| McCauley, Brian | RF | Phoenix Lights | 23 | 06/20/1992 | Appleton | USA | Left | Left | 6' 0" | 195 lbs | - |
| McClain, Ray | MR | Riverside Red Bulls | 28 | 12/16/1987 | Brownsville | USA | Left | Left | 6' 2" | 190 lbs | - |
| McClendon, Terrence | 2B | Free Agent | 26 | 11/17/1989 | Sunrise Manor | USA | Right | Right | 6' 1" | 215 lbs | - |
| McClure, Abel | CF | Prussian Marxists | 23 | 11/07/1992 | Queens | USA | Right | Right | 6' 0" | 190 lbs | - |
| McClurkin, Ernie | 3B | Free Agent | 26 | 08/04/1989 | Inglewood | USA | Left | Right | 6' 3" | 227 lbs | - |
| McCord, Howard | SS | Free Agent | 26 | 04/12/1989 | Manhattan | USA | Right | Right | 6' 0" | 218 lbs | - |
| McCoy, Craig | CF | Free Agent | 26 | 04/25/1989 | Delano | USA | Right | Right | 5' 11" | 220 lbs | - |
| McCoy, Steve | C | Sandy Springs Spartans | 29 | 04/28/1986 | Bangor | USA | Right | Right | 6' 0" | 183 lbs | - |
| McCullough, Kevin | 2B | Free Agent | 27 | 05/12/1988 | He'eia | USA | Right | Right | 6' 0" | 200 lbs | - |
| McDonald, Terry | 1B | Madison Beehive | 24 | 02/06/1991 | Needville | USA | Right | Right | 6' 1" | 205 lbs | - |
| McGahaln, Bobby | RF | San Antonio Storm Troopers | 26 | 01/28/1989 | Thornton | USA | Right | Left | 6' 1" | 201 lbs | - |
| McGeoch, Ralph | 3B | Murfreesboro Deacons | 30 | 08/21/1985 | Staten Island | USA | Left | Right | 6' 2" | 227 lbs | - |
| McGillis, Herb | LF | Riverside Red Bulls | 20 | 10/31/1995 | St. John's | CAN | Left | Right | 5' 10" | 170 lbs | - |
| McGinnis, John | MR | Free Agent | 23 | 03/13/1992 | Scottsdale | USA | Left | Left | 6' 0" | 210 lbs | - |
| McIlmoyle, Hank | SP | San Antonio Storm Troopers | 20 | 10/03/1995 | Vancouver | CAN | Left | Left | 6' 4" | 225 lbs | - |
| McIlrevie, Mike | CF | Wichita Wolverines | 23 | 09/01/1992 | Summersville | USA | Right | Right | 6' 0" | 150 lbs | - |
| McKenzie, Lou | C | Free Agent | 24 | 09/26/1991 | Morganville | USA | Right | Right | 6' 0" | 220 lbs | - |
| McKinney, Malcolm | SP | Free Agent | 30 | 08/15/1985 | Tuskegee | USA | Left | Left | 6' 0" | 195 lbs | - |
| McLaughlin, Nick | 1B | San Antonio Storm Troopers | 24 | 09/03/1991 | Mendota | USA | Right | Right | 6' 0" | 188 lbs | - |
| McLaughlin, Pete | SS | Rock River Rats | 25 | 06/17/1990 | Palmdale | USA | Right | Right | 5' 11" | 195 lbs | - |
| McLean, Jack | MR | Sandy Springs Spartans | 24 | 08/02/1991 | Biloxi | USA | Left | Right | 5' 11" | 205 lbs | - |
| McLean, Scott | RF | Spokane Bulldogs | 23 | 11/29/1992 | Missouri City | USA | Right | Left | 6' 1" | 220 lbs | - |
| McLernon, Joe | SP | Silicon Valley Hackers | 25 | 10/09/1990 | Tuskegee | USA | Left | Left | 5' 11" | 195 lbs | - |
| McLernon, Ron | RF | Blackpool Gamblers | 21 | 06/24/1994 | Hermiston | USA | Left | Left | 6' 1" | 220 lbs | - |
| McMillan, Clay | MR | Free Agent | 29 | 06/28/1986 | Kincardine | CAN | Right | Right | 6' 1" | 201 lbs | - |
| Medellín, Rafael | MR | Carson City Mustang | 25 | 02/24/1990 | Sandy | USA | Right | Right | 6' 6" | 205 lbs | - |
| Medina, Jesús | MR | San Antonio Storm Troopers | 21 | 08/26/1994 | San Juan | PUR | Left | Left | 5' 11" | 235 lbs | - |
| Medina, Juan | SP | Newark Jail Birds | 25 | 12/08/1990 | Cabimas | VEN | Right | Right | 6' 0" | 190 lbs | - |
| Medrano, Andrés | C | Free Agent | 30 | 03/07/1985 | Santo Domingo | DOM | Right | Right | 6' 2" | 194 lbs | - |
| Meilaart, Erik | 3B | Phoenix Lights | 26 | 02/25/1989 | Oranjestad | ARU | Right | Right | 6' 1" | 195 lbs | - |
| Mendoza, Pedro | SP | Cincinnati Snaps | 25 | 10/07/1990 | Aledo | USA | Right | Right | 5' 8" | 200 lbs | - |
| Meyer, Alexandre | CF | Blackpool Gamblers | 20 | 10/22/1995 | Mississauga | CAN | Left | Left | 6' 0" | 180 lbs | - |
| Michael, Ronald | SP | Carson City Mustang | 25 | 10/10/1990 | Ord | USA | Left | Right | 6' 1" | 205 lbs | - |
| Michael, Ryan | RF | Free Agent | 29 | 09/03/1986 | Brooklyn | USA | Left | Left | 6' 2" | 223 lbs | - |
| Mifflen, Bryan | MR | Long Island Ducks | 26 | 10/29/1989 | Surrey | CAN | Right | Right | 5' 9" | 190 lbs | - |
| Miller, Ed | MR | Wichita Wolverines | 25 | 10/06/1990 | Logansport | USA | Left | Right | 6' 0" | 200 lbs | - |
| Miller, Gary | MR | Free Agent | 24 | 06/13/1991 | Yorba Linda | USA | Left | Left | 6' 0" | 190 lbs | - |
| Miller, Stan | MR | Free Agent | 26 | 05/02/1989 | Owasso | USA | Right | Right | 6' 1" | 215 lbs | - |
| Millman, Jeff | LF | Jacksonville Hellcats | 28 | 05/15/1987 | Lamont | USA | Left | Right | 6' 3" | 205 lbs | - |
| Mills, Alan | SP | Prussian Marxists | 23 | 08/23/1992 | Dallas | USA | Left | Left | 5' 9" | 210 lbs | - |
| Mills, Billy | MR | Lake of the Isles Wolves | 26 | 04/13/1989 | San Jose | USA | Right | Right | 5' 10" | 195 lbs | - |
| Miranda, Guillermo | SP | Asheville Tourists | 23 | 03/21/1992 | Ensenada | MEX | Switch | Right | 6' 4" | 245 lbs | - |
| Miranda, Rafael | SP | Madison Beehive | 24 | 05/13/1991 | Orlando | USA | Right | Right | 6' 1" | 205 lbs | - |
| Mitchell, Carl | 1B | Blackpool Gamblers | 22 | 10/22/1993 | Pulaski | USA | Right | Right | 6' 3" | 250 lbs | - |
| Mitchell, Nathan | MR | San Antonio Storm Troopers | 25 | 03/13/1990 | Mesquite | USA | Right | Right | 6' 2" | 188 lbs | - |
| Mitchell, Tommy | SP | Asheville Tourists | 24 | 11/29/1991 | San Anselmo | USA | Right | Right | 5' 11" | 225 lbs | - |
| Miyamoto, Suezo | SP | Silicon Valley Hackers | 26 | 12/30/1989 | Kyoto | JPN | Right | Right | 5' 11" | 185 lbs | - |
| Mizuno, Sosa | 2B | Cincinnati Snaps | 20 | 05/09/1995 | Moroyama | JPN | Left | Right | 6' 2" | 195 lbs | - |
| Montañio, Ovidio | CL | Rock River Rats | 21 | 03/10/1994 | Mexico City | MEX | Right | Right | 5' 11" | 205 lbs | - |
| Montgomery, Myles | LF | Phoenix Lights | 24 | 07/01/1991 | Hawthorne | USA | Left | Right | 6' 4" | 225 lbs | - |
| Mooney, Eddie | C | Spokane Bulldogs | 25 | 09/06/1990 | Santa Ana | USA | Right | Right | 6' 4" | 205 lbs | - |
| Moore, Aaron | LF | Free Agent | 22 | 09/16/1993 | Cookeville | USA | Left | Left | 6' 4" | 205 lbs | - |
| Moore, Bob | MR | Anniston Cougars | 22 | 07/24/1993 | Holladay | USA | Left | Right | 5' 11" | 205 lbs | - |
| Moore, Don | SS | Newark Jail Birds | 24 | 04/30/1991 | Shreveport | USA | Right | Right | 6' 3" | 210 lbs | - |
| Moore, Edmund | C | Lake of the Isles Wolves | 24 | 10/28/1991 | Kansas City | USA | Right | Right | 6' 0" | 195 lbs | - |
| Moore, Rusty | SP | Madison Beehive | 24 | 08/30/1991 | Manhattan | USA | Right | Right | 6' 0" | 220 lbs | - |
| Morán, Manuel | MR | Free Agent | 28 | 09/18/1987 | Williamstown | USA | Right | Right | 6' 0" | 224 lbs | - |
| Moreno, Armando | 3B | Anniston Cougars | 17 | 11/09/1998 | Guadalajara | MEX | Left | Right | 6' 0" | 185 lbs | - |
| Morrison, Mike | C | Cincinnati Snaps | 25 | 01/19/1990 | South Bend | USA | Right | Right | 6' 3" | 195 lbs | - |
| Moser, Brian | CF | Free Agent | 27 | 03/22/1988 | Marinette | USA | Left | Left | 6' 1" | 192 lbs | - |
| Mosley, Carl | SS | Free Agent | 26 | 02/18/1989 | Toledo | USA | Left | Right | 6' 3" | 222 lbs | - |
| Moss, Melvin | C | San Antonio Storm Troopers | 23 | 08/03/1992 | Indianapolis | USA | Right | Right | 6' 1" | 205 lbs | - |
| Moya, Carlos | CL | Prussian Marxists | 20 | 04/12/1995 | Santiago de Cuba | CUB | Right | Right | 5' 10" | 220 lbs | - |
| Mrazek, Herb | CF | Cincinnati Snaps | 21 | 07/21/1994 | Guelph | CAN | Switch | Right | 6' 0" | 185 lbs | - |
| Msrah, Zewdie | RF | Free Agent | 26 | 12/02/1989 | Watertown | USA | Left | Left | 6' 3" | 220 lbs | - |
| Mullins, Brendan | SS | New York Ninjas | 27 | 07/20/1988 | Kettering | USA | Left | Right | 6' 3" | 202 lbs | - |
| Muñóz, Alberto | MR | Free Agent | 23 | 02/24/1992 | Stockton | USA | Right | Right | 6' 6" | 224 lbs | - |
| Muñóz, Arturo | MR | Free Agent | 28 | 01/02/1987 | Oakley | USA | Left | Right | 6' 0" | 187 lbs | - |
| Muñóz, Eduardo | MR | Sandy Springs Spartans | 31 | 07/30/1984 | Santiago | DOM | Left | Right | 6' 0" | 199 lbs | - |
| Murakami, Sozui | C | Free Agent | 27 | 09/06/1988 | Champaign | USA | Right | Right | 5' 10" | 190 lbs | - |
| Murillo, Fernando | RF | New York Ninjas | 18 | 07/26/1997 | Cotuí | DOM | Left | Left | 6' 0" | 205 lbs | - |
| Murphy, Alfonso | MR | Ottawa Outlaws | 28 | 07/20/1987 | South Gate | USA | Switch | Right | 6' 1" | 180 lbs | - |
| Murphy, Earnest | MR | Free Agent | 26 | 06/10/1989 | Grapevine | USA | Switch | Right | 5' 11" | 190 lbs | - |
| Murphy, Eskil | CF | Prussian Marxists | 24 | 01/22/1991 | Lincoln | USA | Right | Right | 5' 9" | 165 lbs | - |
| Murray, Will | MR | Murfreesboro Deacons | 26 | 08/24/1989 | Rockford | USA | Right | Right | 6' 0" | 200 lbs | - |
| Murtagh, Mike | 3B | Free Agent | 30 | 03/12/1985 | Painesville | USA | Left | Left | 6' 2" | 218 lbs | - |
