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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MacAldonich, Perry | RP | Biloxi Shuckers | 24 | 10/01/2015 | Tulsa | USA | Right | Right | 6' 1" | 205 lbs | - |
| Mack, Craig | RP | Belvedere Park Rawhides | 25 | 03/25/2014 | Camarillo | USA | Right | Right | 6' 0" | 200 lbs | - |
| Manchester, Eric | 2B | Marquette Miners | 25 | 07/19/2014 | Hammond | USA | Left | Right | 6' 1" | 200 lbs | - |
| Marín, Luis | C | Marquette Miners | 26 | 04/26/2013 | Las Tunas | CUB | Right | Right | 6' 0" | 205 lbs | - |
| Marshall, Mike | SS | Bethesda Atoms | 27 | 10/24/2012 | Morada | USA | Right | Right | 5' 10" | 190 lbs | - |
| Martin, Jamie | RP | Richland Rails | 27 | 06/22/2012 | Lucea | JAM | Left | Left | 5' 11" | 185 lbs | - |
| Martínez, Víctor | 1B | Akron Blimps | 24 | 01/02/2015 | San Juan | PUR | Right | Right | 6' 2" | 225 lbs | - |
| Maxwell, Jim | RP | Ottawa Nationals | 24 | 03/28/2015 | Aiken | USA | Right | Right | 6' 4" | 190 lbs | - |
| McBride, Jeff | RP | Ottawa Nationals | 26 | 02/06/2013 | Chicago | USA | Left | Left | 6' 4" | 200 lbs | - |
| McConnell, Sam | 3B | Billings Polar Bears | 24 | 09/10/2015 | Washington | USA | Right | Right | 6' 3" | 205 lbs | - |
| McFadden, Larry | RP | Billings Polar Bears | 24 | 06/30/2015 | Annandale | USA | Right | Right | 6' 2" | 195 lbs | - |
| McIndeor, Kevin | RF | Asheville Highlanders | 28 | 07/06/2011 | Ft. Worth | USA | Left | Left | 6' 1" | 195 lbs | - |
| McKendrick, Ray | SP | Athletic Club KC Academy | 23 | 11/12/2016 | Rutherford | USA | Left | Right | 6' 0" | 195 lbs | - |
| McSriff, Rey | 1B | Ottawa Nationals | 28 | 05/09/2011 | Salem | USA | Right | Right | 6' 4" | 225 lbs | - |
| Meaker, Mo | RF | Biloxi Shuckers | 24 | 06/05/2015 | Belize | BLZ | Switch | Right | 5' 11" | 185 lbs | - |
| Méndez, Jesús | SS | Marquette Miners | 24 | 05/27/2015 | Bayamón | PUR | Right | Right | 6' 2" | 205 lbs | - |
| Merenda, Jessie | SS | Biloxi Shuckers | 24 | 09/17/2015 | Lochearn | USA | Right | Right | 6' 1" | 190 lbs | - |
| Middleton, Joe | C | Richland Rails | 23 | 02/06/2016 | Denver | USA | Switch | Right | 6' 1" | 215 lbs | - |
| Miller, Victor | 2B | Billings Polar Bears | 24 | 08/26/2015 | Melvindale | USA | Switch | Right | 6' 0" | 195 lbs | - |
| Mo, De-wei | SS | San Antonio BC | 27 | 07/01/2012 | Taipei | TPE | Right | Right | 6' 2" | 205 lbs | - |
| Moreau, Vincent | RP | Tacoma Fur Traders | 25 | 12/21/2014 | Saint-Marc | HAI | Right | Right | 6' 4" | 205 lbs | - |
| Morel, Franck | 1B | Belvedere Park Rawhides | 20 | 10/28/2019 | Guérande | FRA | Right | Right | 6' 3" | 215 lbs | - |
| Moreno, Júlio | RF | Ottawa Nationals | 28 | 02/28/2011 | Valencia | VEN | Switch | Right | 6' 1" | 195 lbs | - |
| Morris, Frank | RF | Asheville Highlanders | 24 | 01/11/2015 | Zephyrhills South | USA | Left | Left | 6' 5" | 215 lbs | - |
| Moy, Jang-lu | RP | Belvedere Park Rawhides | 22 | 07/07/2017 | Taipei | TPE | Left | Left | 6' 2" | 190 lbs | - |
| Mud, Eddo | RP | Free Agent | 29 | 11/25/2010 | Little Bay | SIM | Right | Right | 6' 7" | 210 lbs | - |
| Mullen, Matt | C | Bethesda Atoms | 22 | 03/11/2017 | Mentor | USA | Left | Right | 6' 0" | 210 lbs | - |
| Muñóz, Ramón | C | Bethesda Atoms | 25 | 04/12/2014 | Arraijan | PAN | Switch | Right | 6' 2" | 200 lbs | - |
