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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MacBride, Harry | RP | Erie SeaWolves | 31 | 11/11/2010 | Mississauga | CAN | Left | Left | 6' 0" | 200 lbs | - |
| MacDonald, Nate | RP | Mahoning Valley Scrappers | 24 | 12/01/2017 | South Hooksett | USA | Right | Right | 6' 2" | 200 lbs | - |
| MacGruder, Dan | RP | Erie SeaWolves | 31 | 01/30/2011 | Mansfield | USA | Right | Right | 5' 10" | 195 lbs | - |
| Makeever, Randy | SP | Hartford Yard Goats | 25 | 06/11/2017 | Toronto | CAN | Right | Right | 6' 4" | 205 lbs | - |
| Manning, Jeff | 2B | Harrisburg Senators | 27 | 04/19/2015 | Erwin | USA | Right | Right | 5' 10" | 185 lbs | - |
| Margerson, Ben | 1B | Free Agent | 27 | 07/31/2014 | Los Angeles | USA | Right | Right | 6' 9" | 205 lbs | - |
| Marino, Orlando | SP | Mahoning Valley Scrappers | 24 | 12/02/2017 | San Miguelito | PAN | Left | Left | 6' 3" | 200 lbs | - |
| Marrero, Ánibal | SP | New Hampshire Fisher Cats | 28 | 05/16/2014 | Santo Domingo | DOM | Right | Right | 6' 6" | 205 lbs | - |
| Martin, Rocky | 2B | Free Agent | 26 | 07/09/2015 | Laurel | USA | Right | Right | 6' 0" | 180 lbs | - |
| Martus, Mario | RP | Free Agent | 28 | 03/31/2014 | Maracaibo | VEN | Right | Right | 6' 8" | 205 lbs | - |
| Martínez, António | SP | Portland Sea Dogs | 22 | 06/01/2020 | Yauco | PUR | Right | Right | 6' 8" | 200 lbs | - |
| Martínez, Gilberto | 1B | Hartford Yard Goats | 23 | 11/30/2018 | Santo Domingo | DOM | Right | Right | 6' 4" | 210 lbs | - |
| Martínez, Jesús | SS | Mahoning Valley Scrappers | 23 | 12/02/2018 | Palma Soriano | CUB | Switch | Right | 6' 2" | 185 lbs | - |
| Mason, Dave | 2B | Free Agent | 26 | 03/10/2016 | Grandview | USA | Right | Right | 6' 5" | 200 lbs | - |
| Mateo, Juan | SS | Harrisburg Senators | 21 | 12/29/2020 | Oak Harbor | USA | Right | Right | 6' 1" | 175 lbs | - |
| McCarty, Bob | RP | Free Agent | 28 | 02/21/2014 | Black Earth | USA | Right | Right | 5' 10" | 195 lbs | - |
| McClellan, Bob | SP | Free Agent | 28 | 09/16/2013 | Pikesville | USA | Right | Right | 6' 1" | 200 lbs | - |
| McClenaghan, Shawn | SP | Free Agent | 28 | 01/27/2014 | Albion | USA | Right | Right | 6' 8" | 200 lbs | - |
| McNeal, Jim | LF | Akron RubberDucks | 24 | 10/28/2017 | Ft. Worth | USA | Left | Left | 6' 4" | 205 lbs | - |
| McRandal, Kevin | RF | Free Agent | 27 | 09/29/2014 | University Park | USA | Switch | Right | 6' 2" | 200 lbs | - |
| Medina, Wilson | CF | Bowie Baysox | 24 | 03/10/2018 | Guatire | VEN | Switch | Right | 6' 2" | 190 lbs | - |
| Mejía, Norberto | 1B | Free Agent | 24 | 08/06/2017 | Santo Domingo | DOM | Switch | Right | 6' 4" | 200 lbs | - |
| Meléndez, Jim | 2B | Richmond Flying Squirrels | 27 | 06/13/2015 | Burlington | USA | Left | Right | 6' 0" | 205 lbs | - |
| Mendoza, José | C | Richmond Flying Squirrels | 25 | 02/14/2017 | La Dolorita | VEN | Left | Right | 6' 2" | 200 lbs | - |
| Merritt, River | C | Harrisburg Senators | 27 | 03/27/2015 | Chesterfield | USA | Right | Right | 6' 1" | 200 lbs | - |
| Meser, Torsten | CL | Akron RubberDucks | 22 | 10/11/2019 | Delaware | USA | Right | Right | 6' 5" | 200 lbs | - |
| Mickens, Kevin | SP | Mahoning Valley Scrappers | 25 | 07/26/2016 | Largo | USA | Right | Right | 6' 2" | 200 lbs | - |
| Miller, Ben | 3B | New Hampshire Fisher Cats | 28 | 07/30/2013 | Ward | USA | Right | Right | 6' 2" | 200 lbs | $750,000 |
| Miller, Danny | CL | Reading Fightin Phils | 23 | 11/07/2018 | Anchorage | USA | Right | Right | 5' 10" | 185 lbs | - |
| Miller, Doug | C | New Hampshire Fisher Cats | 28 | 03/06/2014 | Bullhead City | USA | Right | Right | 6' 0" | 200 lbs | - |
| Miller, Ethan | SP | Reading Fightin Phils | 22 | 10/28/2019 | Superior | USA | Right | Right | 6' 3" | 190 lbs | - |
| Miller, Greg | SP | Hartford Yard Goats | 23 | 12/14/2018 | Rancho Cucamonga | USA | Right | Right | 6' 3" | 205 lbs | - |
| Miller, Josh | RF | Somerset Patriots | 23 | 11/11/2018 | Citrus | USA | Left | Left | 6' 4" | 200 lbs | - |
| Miller, Sid | RP | Portland Sea Dogs | 25 | 09/07/2016 | Cascade-Fairwood | USA | Left | Right | 6' 0" | 190 lbs | - |
| Milligan, Joe | CF | Erie SeaWolves | 34 | 08/10/2007 | Milwaukee | USA | Right | Right | 6' 0" | 205 lbs | - |
| Mitchell, Al | CF | Somerset Patriots | 25 | 07/28/2016 | Silver Spring | USA | Right | Right | 6' 2" | 205 lbs | - |
| Monroe, Duane | LF | Reading Fightin Phils | 26 | 07/18/2015 | Haubstadt | USA | Right | Right | 6' 4" | 200 lbs | - |
| Montés, Adrián | RP | Free Agent | 28 | 09/19/2013 | Barahona | DOM | Switch | Right | 6' 2" | 185 lbs | - |
| Moore, Claude | SP | Free Agent | 29 | 02/17/2013 | Pedley | USA | Right | Right | 6' 4" | 200 lbs | - |
| Moore, Stan | 1B | Hartford Yard Goats | 24 | 11/25/2017 | Norco | USA | Right | Left | 6' 6" | 215 lbs | - |
| Morales, Víctor | C | Portland Sea Dogs | 23 | 05/05/2019 | Parkland | USA | Right | Right | 6' 0" | 190 lbs | - |
| Morris, Chad | 3B | Bowie Baysox | 26 | 05/28/2016 | San Jose | USA | Right | Right | 6' 5" | 200 lbs | - |
| Morris, Phil | SP | Harrisburg Senators | 28 | 04/23/2014 | Duxbury | USA | Right | Right | 6' 2" | 205 lbs | - |
| Morris, Tony | 1B | Free Agent | 28 | 09/16/2013 | Missoula | USA | Right | Right | 6' 0" | 200 lbs | - |
| Murphy, Dave | RP | Free Agent | 29 | 04/01/2013 | Rutherford | USA | Left | Left | 6' 0" | 185 lbs | - |
| Murphy, Erik | 2B | Akron RubberDucks | 23 | 09/22/2018 | San Dimas | USA | Right | Right | 5' 10" | 175 lbs | - |
| Muñóz, Rubén | C | Free Agent | 28 | 02/10/2014 | Laguna Salada | DOM | Left | Right | 6' 0" | 205 lbs | - |
| Muñóz, Tony | RP | Erie SeaWolves | 28 | 11/01/2013 | Santiago | DOM | Left | Left | 6' 4" | 200 lbs | - |
| Myers, Dan | 3B | Akron RubberDucks | 25 | 08/29/2016 | Brewster | USA | Right | Right | 6' 4" | 200 lbs | - |
| Méndez, Ernesto | 2B | Akron RubberDucks | 21 | 02/07/2021 | Santiago | DOM | Switch | Right | 6' 0" | 190 lbs | - |
| Méndez, José | SP | New Hampshire Fisher Cats | 28 | 10/13/2013 | Cotuí | DOM | Right | Right | 6' 4" | 200 lbs | - |
