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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Mack, Craig | RP | Belvedere Park Rawhides | 24 | 03/25/2014 | Camarillo | USA | Right | Right | 6' 0" | 195 lbs | - |
| Madris, Bligh | RP | Akron Blimps | 25 | 03/22/2013 | Cave Spring | USA | Switch | Right | 5' 9" | 175 lbs | - |
| Magee, Donnie | 3B | Akron Blimps | 28 | 08/09/2010 | Salina | USA | Switch | Right | 6' 0" | 210 lbs | - |
| Manchester, Eric | 2B | Marquette Miners | 24 | 07/19/2014 | Hammond | USA | Left | Right | 6' 1" | 195 lbs | - |
| Marín, Luis | C | Marquette Miners | 25 | 04/26/2013 | Las Tunas | CUB | Right | Right | 6' 0" | 205 lbs | - |
| Marroquín, Héctor | RP | Durham Rapiers | 25 | 11/23/2013 | Santo Domingo | DOM | Right | Right | 6' 0" | 175 lbs | - |
| Marshall, Mike | SS | Bethesda Atoms | 26 | 10/24/2012 | Morada | USA | Right | Right | 5' 10" | 185 lbs | - |
| Martin, Jamie | RP | Richland Rails | 26 | 06/22/2012 | Lucea | JAM | Left | Left | 5' 11" | 185 lbs | - |
| Martínez, Claudio | RP | Bethesda Atoms | 26 | 12/14/2012 | Chinandega | NCA | Left | Right | 6' 0" | 200 lbs | - |
| Martínez, Freddy | RP | Marquette Miners | 27 | 07/30/2011 | Chetumal | MEX | Right | Right | 6' 3" | 200 lbs | - |
| Mata, Tomás | SP | Casper Ghosts | 25 | 05/13/2013 | Araure | VEN | Right | Right | 6' 7" | 225 lbs | - |
| Maxwell, Jim | RP | Ottawa Nationals | 23 | 03/28/2015 | Aiken | USA | Right | Right | 6' 4" | 195 lbs | - |
| McBride, Jeff | RP | Ottawa Nationals | 25 | 02/06/2013 | Chicago | USA | Left | Left | 6' 4" | 200 lbs | - |
| McDermott, Jeff | SP | Marquette Miners | 24 | 07/08/2014 | Santa Ana | USA | Left | Left | 6' 7" | 220 lbs | - |
| McFly, Marty | SP | Casper Ghosts | 23 | 01/17/2015 | Crescent Hill | USA | Right | Right | 6' 2" | 185 lbs | - |
| McIndeor, Kevin | RF | Asheville Highlanders | 27 | 07/06/2011 | Ft. Worth | USA | Left | Left | 6' 1" | 190 lbs | - |
| McSriff, Rey | 1B | Ottawa Nationals | 27 | 05/09/2011 | Salem | USA | Right | Right | 6' 4" | 220 lbs | - |
| Medranda, Manuel | SP | Asheville Highlanders | 28 | 07/24/2010 | Santo Domingo | DOM | Right | Right | 6' 4" | 210 lbs | - |
| Mehoff, Walke | RF | Casper Ghosts | 21 | 05/09/2017 | Kapelle | NED | Right | Right | 6' 1" | 190 lbs | - |
| Mejía, Javier | RP | Billings Polar Bears | 26 | 04/01/2012 | Gravilias | CRC | Right | Right | 5' 11" | 190 lbs | - |
| Méndez, Jesús | SS | Marquette Miners | 23 | 05/27/2015 | Bayamón | PUR | Right | Right | 6' 2" | 200 lbs | - |
| Mielke, Brant | RP | Billings Polar Bears | 24 | 04/17/2014 | Hines | USA | Left | Left | 6' 4" | 205 lbs | - |
| Mitchell, Wilson | 2B | Bethesda Atoms | 26 | 03/02/2012 | Sunnyvale | USA | Right | Right | 6' 1" | 210 lbs | - |
| Mo, De-wei | SS | San Antonio BC | 26 | 07/01/2012 | Taipei | TPE | Right | Right | 6' 2" | 205 lbs | - |
| Moore, Curt | CL | Durham Rapiers | 24 | 12/08/2014 | Florence-Roebling | USA | Left | Left | 6' 1" | 190 lbs | - |
| Morales, César | SP | Durham Rapiers | 25 | 07/04/2013 | Damas | CRC | Right | Right | 6' 0" | 175 lbs | - |
| Morán, Sergio | 1B | Marquette Miners | 22 | 10/17/2016 | Chicago | USA | Left | Left | 6' 3" | 225 lbs | - |
| Moreno, Carlos | CF | Casper Ghosts | 25 | 08/21/2013 | Boca Chica | DOM | Right | Right | 6' 2" | 190 lbs | - |
| Moreno, Júlio | RF | Ottawa Nationals | 27 | 02/28/2011 | Valencia | VEN | Switch | Right | 6' 1" | 195 lbs | - |
| Moy, Jang-lu | RP | Belvedere Park Rawhides | 21 | 07/07/2017 | Taipei | TPE | Left | Left | 6' 2" | 180 lbs | - |
| Muñóz, Gabriel | 1B | Billings Polar Bears | 24 | 07/14/2014 | Santiago | CHI | Left | Left | 6' 3" | 205 lbs | - |
| Muñóz, Ramón | C | Bethesda Atoms | 24 | 04/12/2014 | Arraijan | PAN | Switch | Right | 6' 2" | 200 lbs | - |
