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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MacDonald, Cornell | CF | Bloomington Longnecks | 26 | 10/02/2013 | Lawton | USA | Right | Right | 6' 0" | 195 lbs | - |
| Macías, António | 3B | Alaskan Humpbacks | 20 | 02/22/2019 | San Nicolas | CRC | Right | Right | 6' 1" | 175 lbs | - |
| MacIntosh, Cam | SS | Bakersfield Nobles | 34 | 08/26/2005 | New York | USA | Right | Right | 6' 2" | 205 lbs | - |
| MacPherson, Carl | SP | Texas Bronze Sox | 28 | 11/24/2011 | North York | USA | Right | Right | 6' 0" | 195 lbs | $280,000 |
| MacRach, Jim | 1B | Brinkley Belugas | 29 | 09/29/2010 | Chicago | USA | Right | Right | 5' 10" | 210 lbs | $280,000 |
| Madris, Bligh | RP | Scranton Supernovas | 26 | 03/22/2013 | Cave Spring | USA | Switch | Right | 5' 9" | 170 lbs | $280,000 |
| Mahusay, Onye | SS | Bloomington Longnecks | 28 | 04/12/2011 | Parang | PHI | Left | Right | 6' 1" | 190 lbs | - |
| Malone, Kevin | C | Calgary Lynx | 33 | 08/29/2006 | Unknown | ENG | Right | Right | 6' 1" | 230 lbs | - |
| Márquez, Manuel | 2B | Jersey City Tritons | 22 | 02/04/2017 | Havana | CUB | Right | Right | 6' 1" | 180 lbs | - |
| Marshall, Darby | RP | Free Agent | 30 | 07/19/2009 | North Fair Oaks | USA | Switch | Right | 6' 3" | 210 lbs | - |
| Martí, Juan Andrés | 3B | Bakersfield Nobles | 20 | 08/03/2019 | Santiago | DOM | Left | Right | 6' 0" | 170 lbs | $280,000 |
| Martin, Kylian | RP | Texas Bronze Sox | 19 | 03/25/2020 | Lunel | FRA | Right | Right | 6' 7" | 195 lbs | - |
| Martínez, Ricardo | SP | Alaskan Humpbacks | 25 | 04/14/2014 | Panama | PAN | Right | Right | 5' 11" | 155 lbs | - |
| Masuda, Takejiro | CL | Santa Barbara Golden Cranes | 21 | 05/20/2018 | Omagari | JPN | Left | Left | 5' 9" | 165 lbs | - |
| Mata'afa, Hercules | SP | Texas Bronze Sox | 30 | 07/07/2009 | Glen Avon | USA | Left | Left | 6' 0" | 195 lbs | - |
| Maughan, Kevin | SP | Texas Bronze Sox | 30 | 03/22/2009 | Mauldin | USA | Right | Right | 6' 2" | 210 lbs | $280,000 |
| Mayasich, John | CF | Bakersfield Nobles | 27 | 07/07/2012 | Minneapolis | USA | Right | Right | 6' 2" | 200 lbs | $280,000 |
| McCrimmon, Aubrey | RP | Calgary Lynx | 33 | 05/23/2006 | St. Charles | USA | Right | Right | 6' 0" | 200 lbs | - |
| Melena, Currito | RP | Texas Bronze Sox | 33 | 03/02/2006 | Santo Domingo | DOM | Right | Right | 6' 1" | 185 lbs | - |
| Méndez, Matt | CF | Scranton Supernovas | 23 | 07/06/2016 | Oak Ridge | USA | Right | Right | 5' 9" | 185 lbs | - |
| Milliken, David | 2B | Bloomington Longnecks | 24 | 10/22/2015 | Cody | USA | Right | Right | 6' 2" | 210 lbs | - |
| Montés, Javier | SP | Alaskan Humpbacks | 21 | 12/10/2018 | Somoto | NCA | Right | Right | 6' 6" | 210 lbs | - |
| Moon, Jon | LF | Alaskan Humpbacks | 31 | 12/28/2008 | New York | USA | Right | Left | 6' 1" | 210 lbs | - |
| Moonglampers, Dino | RP | Santa Barbara Golden Cranes | 33 | 04/08/2006 | El Paso | USA | Right | Right | 6' 4" | 215 lbs | - |
| Moons, Manny | CF | Calgary Lynx | 27 | 11/10/2012 | Springfield | USA | Right | Right | 6' 0" | 205 lbs | - |
| Moreau, Érik | RP | Texas Bronze Sox | 30 | 01/14/2009 | Paris | FRA | Switch | Right | 6' 4" | 230 lbs | - |
| Mullens, Kyle | SS | Santa Barbara Golden Cranes | 25 | 11/23/2014 | North Shore | NZL | Left | Right | 6' 4" | 200 lbs | - |
| Muñóz, Roberto | SP | Texas Bronze Sox | 32 | 06/18/2007 | Maracaibo | VEN | Left | Left | 6' 0" | 175 lbs | $280,000 |
| Murguia, Víctor | SS | Texas Bronze Sox | 30 | 06/27/2009 | Campo Gobierno | MEX | Right | Right | 6' 3" | 230 lbs | - |
