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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Madaev, Leo | SP | Ballard Beavers | 18 | 02/20/2019 | Moscow | RUS | Right | Right | 6' 1" | 170 lbs | - |
| Makepeace, Zak | 3B | Franklin Fire | 20 | 11/10/2017 | Kingston | JAM | Left | Right | 6' 1" | 185 lbs | - |
| Malik, Alois | CF | Franklin Fire | 22 | 12/29/2015 | Bronx | USA | Right | Right | 6' 4" | 205 lbs | - |
| Marino, Bernardo | 2B | Tulsa Otters | 20 | 11/20/2017 | San Pedro de Macorís | DOM | Right | Right | 6' 2" | 180 lbs | - |
| Marrero, Ricardo | SP | Ellesmere Island Snowpeople | 20 | 05/03/2017 | Chichicastenango | GUA | Switch | Right | 6' 3" | 180 lbs | - |
| Martínez, José | SP | Franklin Fire | 21 | 04/19/2016 | Misantla | MEX | Right | Right | 6' 0" | 180 lbs | - |
| Martínez, Mario | RP | Capital Hill Interns | 19 | 04/04/2018 | Mexicali | MEX | Switch | Right | 6' 4" | 190 lbs | - |
| Martínez, Roberto | 2B | Free Agent | 21 | 03/21/2016 | San Juan | PUR | Right | Right | 6' 1" | 185 lbs | - |
| Mateu, Jorge | 2B | Franklin Fire | 20 | 05/25/2017 | Santa Barbara | GUA | Left | Right | 6' 3" | 185 lbs | - |
| Matsunaga, Kiyotaka | SP | Ballard Beavers | 18 | 10/28/2019 | Katano | JPN | Left | Left | 6' 1" | 170 lbs | - |
| McClellan, Rodney | RF | Montgomery Biscuits | 19 | 02/19/2018 | Coconut Creek | USA | Left | Left | 6' 8" | 210 lbs | - |
| McGhee, Nick | CF | Franklin Fire | 19 | 11/17/2018 | Security-Widefield | USA | Right | Right | 6' 0" | 175 lbs | - |
| McIlduy, Hugh | 3B | Free Agent | 20 | 07/11/2017 | Lebanon | USA | Right | Right | 6' 1" | 180 lbs | - |
| Méndez, Ricardo | SP | Free Agent | 18 | 06/14/2019 | Santo Domingo | DOM | Left | Left | 6' 6" | 200 lbs | - |
| Mendoza, Doug | C | Free Agent | 20 | 07/12/2017 | Lake Morton-Berrydale | USA | Left | Right | 6' 2" | 195 lbs | - |
| Menéndez, Alberto | 3B | Moose Jaw Canucks | 20 | 12/24/2017 | Mérida | VEN | Right | Right | 6' 0" | 180 lbs | - |
| Milatovic, Boris | RP | Montgomery Biscuits | 17 | 06/24/2020 | Asenovgrad | BUL | Right | Right | 5' 10" | 155 lbs | - |
| Miller, Aubrey | 1B | Montgomery Biscuits | 20 | 02/18/2017 | Bloomington | USA | Right | Right | 6' 2" | 220 lbs | - |
| Mitchell, Chris | RP | Free Agent | 25 | 07/05/2012 | Bells | USA | Right | Left | 6' 4" | 210 lbs | - |
| Miyake, Jiro | 1B | Moose Jaw Canucks | 18 | 10/02/2019 | Higashikurume | JPN | Left | Right | 6' 0" | 190 lbs | - |
| Montaño, Víctor | CF | Quebec City Baby Blues | 20 | 10/02/2017 | Santo Domingo | DOM | Right | Right | 6' 2" | 185 lbs | - |
| Montgomery, Alvin | CF | Free Agent | 19 | 04/16/2018 | Mesa | USA | Left | Left | 6' 4" | 190 lbs | - |
| Montgomery, John | SS | Tulsa Otters | 19 | 09/25/2018 | New York | USA | Right | Right | 6' 0" | 175 lbs | - |
| Moore, John | SP | Capital Hill Interns | 21 | 01/10/2016 | King of Prussia | USA | Left | Left | 6' 6" | 215 lbs | - |
| Moran, Floyd | RP | Capital Hill Interns | 20 | 08/21/2017 | New York | USA | Right | Right | 6' 2" | 190 lbs | - |
| Moreno, Jorge | SP | Ballard Beavers | 22 | 08/22/2015 | Santo Domingo | DOM | Left | Left | 6' 1" | 175 lbs | - |
| Morillo, Jesús | CL | Moose Jaw Canucks | 20 | 10/23/2017 | San Marcos | SLV | Right | Right | 6' 1" | 185 lbs | - |
| Moy, Kai-ge | SP | Ballard Beavers | 21 | 10/14/2016 | Hsinchuang | TPE | Right | Right | 6' 5" | 205 lbs | - |
| Muñóz, Jorge | SS | Montgomery Biscuits | 19 | 11/11/2018 | Maracaibo | VEN | Right | Right | 6' 2" | 180 lbs | - |
| Mutahi, Yakobo | SP | Franklin Fire | 20 | 05/25/2017 | Elliot | RSA | Left | Left | 6' 8" | 215 lbs | - |
