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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Machen, Michael | SP | Hialeah Dodos | 35 | 03/19/2006 | Quincy | USA | Right | Right | 6' 0" | 240 lbs | $21,000,000 |
| Magee, Jerry | RP | Tortolita Drummers | 30 | 03/11/2011 | Oceanside | USA | Switch | Right | 6' 3" | 220 lbs | $280,000 |
| Magowan, Arnold | C | Nolensville Knights | 34 | 06/09/2007 | The Colony | USA | Right | Right | 6' 4" | 250 lbs | - |
| Maksimenov, Badry | 3B | Free Agent | 34 | 10/06/2007 | Jamesburg | USA | Left | Right | 6' 1" | 215 lbs | - |
| Manzanedo, Ignacio | SP | Alaskan Humpbacks | 23 | 12/17/2018 | Santa Cruz | ARG | Right | Right | 6' 1" | 180 lbs | - |
| Marinero, León | CL | Nolensville Knights | 31 | 05/15/2010 | Guayaquil | ECU | Right | Right | 6' 2" | 185 lbs | $600,000 |
| Marrero, Pedro | C | Plymouth Rocks | 23 | 04/30/2018 | Vilafranca del Penedès | ESP | Left | Right | 6' 0" | 205 lbs | - |
| Martic, Pacu | C | Free Agent | 32 | 09/11/2009 | Ruse | BUL | Right | Right | 6' 2" | 245 lbs | - |
| Martin, Kent | SP | Pawnee ParksNRec | 25 | 03/02/2016 | Holladay | USA | Right | Right | 6' 1" | 210 lbs | - |
| Martínez, Enrique | RF | Vermont Lake Monsters | 20 | 03/16/2021 | San Cristóbal Verapaz | GUA | Switch | Right | 6' 2" | 180 lbs | - |
| Martínez, Eric | C | Santa Barbara Golden Cranes | 28 | 07/05/2013 | La Habra | USA | Right | Right | 6' 0" | 210 lbs | - |
| Martínez, Ricardo | SP | Alaskan Humpbacks | 27 | 04/14/2014 | Panama | PAN | Right | Right | 5' 11" | 155 lbs | - |
| Mawdesley, Josh | RF | Pawnee ParksNRec | 32 | 06/27/2009 | Claydon | ENG | Right | Right | 6' 1" | 195 lbs | - |
| Maxwell, Dave | 1B | Nolensville Knights | 32 | 09/17/2009 | Rancho Cordova | USA | Right | Right | 6' 3" | 265 lbs | - |
| Maxwell, Kent | LF | Nolensville Knights | 28 | 10/04/2013 | South Euclid | USA | Left | Left | 6' 6" | 240 lbs | - |
| McBride, Chris | 3B | Plymouth Rocks | 28 | 11/06/2013 | Phenix City | USA | Right | Right | 6' 0" | 215 lbs | $280,000 |
| McFillin, Bobby | C | Alaskan Humpbacks | 30 | 05/11/2011 | Shreveport | USA | Right | Right | 6' 1" | 235 lbs | $280,000 |
| McFly, Marty | SP | Florida Men | 26 | 01/17/2015 | Crescent Hill | USA | Right | Right | 6' 2" | 195 lbs | - |
| McMurran, Dallas | 2B | Hialeah Dodos | 30 | 01/16/2011 | Waipahu | USA | Left | Right | 6' 0" | 205 lbs | - |
| Mercier, Xavier | C | Hialeah Dodos | 30 | 02/16/2011 | Torcy | FRA | Switch | Right | 6' 0" | 225 lbs | - |
| Metellus, Peter | C | Florida Men | 33 | 02/27/2008 | New York | USA | Left | Right | 5' 10" | 220 lbs | - |
| Miyake, Jiro | 1B | Vermont Lake Monsters | 22 | 10/02/2019 | Higashikurume | JPN | Left | Right | 6' 0" | 195 lbs | - |
| Montés, Javier | SP | Alaskan Humpbacks | 23 | 12/10/2018 | Somoto | NCA | Right | Right | 6' 6" | 220 lbs | $280,000 |
| Moore, Ken | CF | Tortolita Drummers | 32 | 02/14/2009 | New York | USA | Right | Right | 6' 2" | 210 lbs | - |
| Morgan, Clint | 2B | Santa Barbara Golden Cranes | 27 | 07/14/2014 | Andover | USA | Right | Right | 6' 2" | 210 lbs | - |
| Morterero, António | RP | Alaskan Humpbacks | 25 | 05/08/2016 | Quillón | CHI | Right | Left | 6' 7" | 220 lbs | - |
| Morterero, Ramón | LF | Hialeah Dodos | 32 | 02/11/2009 | Iquitos | PER | Left | Left | 6' 5" | 225 lbs | - |
| Mullens, Kyle | SS | Santa Barbara Golden Cranes | 27 | 11/23/2014 | North Shore | NZL | Left | Right | 6' 4" | 215 lbs | - |
| Murdock, Steve | LF | Santa Barbara Golden Cranes | 24 | 03/13/2017 | Waukesha | USA | Left | Left | 6' 4" | 205 lbs | - |
| Murphy, Abel | 3B | Pawnee ParksNRec | 29 | 04/12/2012 | Medford | USA | Right | Right | 6' 1" | 220 lbs | $280,000 |
| Myung, Jin-yong | LF | Tortolita Drummers | 31 | 03/14/2010 | Gangneung | KOR | Left | Left | 6' 5" | 245 lbs | - |
