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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Machehin, Leonid | LF | Bloomington Longnecks | 21 | 02/09/2019 | Salsk | RUS | Left | Left | 6' 1" | 185 lbs | - |
| Mais, John A. | SP | Baton Rouge Brass | 29 | 04/02/2011 | Koblenz | GER | Right | Right | 6' 5" | 220 lbs | $11,000,000 |
| Malone, Gary | RF | Syracuse Starks | 34 | 08/10/2006 | San Diego | USA | Left | Left | 6' 2" | 240 lbs | - |
| Manshert, Ewan | 1B | Syracuse Starks | 29 | 03/07/2011 | Willemstad | CUR | Left | Right | 6' 5" | 225 lbs | - |
| Manzanedo, Ignacio | SP | Alaskan Humpbacks | 22 | 12/17/2018 | Santa Cruz | ARG | Right | Right | 6' 1" | 170 lbs | - |
| Márquez, Manuel | 2B | Jersey City Tritons | 23 | 02/04/2017 | Havana | CUB | Right | Right | 6' 1" | 190 lbs | $280,000 |
| Martí, Tomás | 3B | Port Royal Disaster | 25 | 09/30/2015 | Santiago | DOM | Right | Right | 6' 2" | 195 lbs | $280,000 |
| Martin, Kylian | RP | Texas Bronze Sox | 20 | 03/25/2020 | Lunel | FRA | Right | Right | 6' 7" | 200 lbs | - |
| Martínez, Ricardo | SP | Alaskan Humpbacks | 26 | 04/14/2014 | Panama | PAN | Right | Right | 5' 11" | 155 lbs | - |
| Maughan, Kevin | SP | Texas Bronze Sox | 31 | 03/22/2009 | Mauldin | USA | Right | Right | 6' 2" | 210 lbs | $280,000 |
| May, Derek | RP | Alaskan Humpbacks | 23 | 08/31/2017 | Woodstock | USA | Left | Right | 5' 10" | 180 lbs | - |
| Mayasich, John | RF | Bakersfield Nobles | 28 | 07/07/2012 | Minneapolis | USA | Right | Right | 6' 2" | 205 lbs | $280,000 |
| McAlear, Dave | SP | Syracuse Starks | 30 | 05/27/2010 | St. Albert | CAN | Left | Left | 6' 0" | 215 lbs | - |
| McBride, Albert | CF | Sacramento Redlegs | 25 | 09/16/2015 | Pacifica | USA | Right | Right | 6' 1" | 190 lbs | - |
| McDaniell, Ollie | SP | Syracuse Starks | 33 | 09/27/2007 | Norwalk | USA | Right | Left | 6' 3" | 210 lbs | - |
| McFillin, Bobby | C | Alaskan Humpbacks | 29 | 05/11/2011 | Shreveport | USA | Right | Right | 6' 1" | 230 lbs | $280,000 |
| Melena, Currito | RP | Texas Bronze Sox | 34 | 03/02/2006 | Santo Domingo | DOM | Right | Right | 6' 1" | 185 lbs | - |
| Mi, Yu-eh | RP | Santa Barbara Golden Cranes | 32 | 12/12/2008 | Keelung | TPE | Left | Left | 6' 7" | 255 lbs | - |
| Mingo, Ron | RP | Bloomington Longnecks | 26 | 01/10/2014 | Indian Springs | USA | Left | Right | 6' 7" | 215 lbs | $280,000 |
| Miranda, Carlos | SS | Bakersfield Nobles | 27 | 11/10/2013 | Palmerton | USA | Right | Right | 6' 3" | 210 lbs | - |
| Moctar, Omara | RP | Bloomington Longnecks | 30 | 02/15/2010 | Nassau | BAH | Left | Right | 6' 2" | 200 lbs | - |
| Molina, Gustavo | SP | Sacramento Redlegs | 23 | 11/10/2017 | Granada | NCA | Right | Right | 6' 2" | 190 lbs | - |
| Montémayor, Domingo | SP | Bloomington Longnecks | 30 | 02/25/2010 | Santo Domingo | DOM | Left | Left | 5' 11" | 205 lbs | - |
| Montés, Javier | SP | Alaskan Humpbacks | 22 | 12/10/2018 | Somoto | NCA | Right | Right | 6' 6" | 215 lbs | - |
| Moon, Jon | LF | Alaskan Humpbacks | 32 | 12/28/2008 | New York | USA | Right | Left | 6' 1" | 205 lbs | - |
| Moran, Rocky | RF | Bakersfield Nobles | 21 | 01/01/2019 | Austin | USA | Right | Right | 6' 3" | 185 lbs | - |
| Moreau, Érik | RP | Texas Bronze Sox | 31 | 01/14/2009 | Paris | FRA | Switch | Right | 6' 4" | 235 lbs | - |
| Morgan, Clint | 2B | Santa Barbara Golden Cranes | 26 | 07/14/2014 | Andover | USA | Right | Right | 6' 2" | 205 lbs | - |
| Moyer, Kevin | RP | Jersey City Tritons | 25 | 11/13/2015 | Montgomery Village | USA | Switch | Right | 6' 7" | 240 lbs | - |
| Mullaney, Chip | CF | Free Agent | 29 | 10/03/2011 | Indianapolis | USA | Right | Right | 6' 1" | 200 lbs | - |
| Mullens, Kyle | SS | Santa Barbara Golden Cranes | 26 | 11/23/2014 | North Shore | NZL | Left | Right | 6' 4" | 210 lbs | - |
| Muñóz, Paco | C | Port Royal Disaster | 35 | 04/16/2005 | Armenia | SLV | Right | Right | 6' 4" | 240 lbs | $672,000 |
| Muñóz, Roberto | SP | Texas Bronze Sox | 33 | 06/18/2007 | Maracaibo | VEN | Left | Left | 6' 0" | 175 lbs | - |
| Murdock, Steve | LF | Santa Barbara Golden Cranes | 23 | 03/13/2017 | Waukesha | USA | Left | Left | 6' 4" | 200 lbs | - |
| Murguia, Víctor | SS | Texas Bronze Sox | 31 | 06/27/2009 | Campo Gobierno | MEX | Right | Right | 6' 3" | 230 lbs | - |
| Myers, Clay | SS | Bloomington Longnecks | 23 | 11/01/2017 | Phillipsburg | USA | Right | Right | 6' 1" | 195 lbs | - |
