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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MacBrayne, Daniel | LF | Yakima Hops | 21 | 09/07/2020 | San Diego | USA | Left | Left | 6' 5" | 215 lbs | - |
| Macías, Manuel | RP | Squirrel Hill Pierogis | 20 | 06/24/2021 | Santo Domingo | DOM | Right | Right | 5' 10" | 175 lbs | - |
| Magana, Domingo | C | Athletic Club KC Academy | 21 | 04/21/2020 | El Tocuyo | VEN | Right | Right | 6' 2" | 195 lbs | - |
| Magee, Aubrey | RF | Squirrel Hill Pierogis | 21 | 04/24/2020 | Sterling Heights | USA | Switch | Right | 6' 4" | 200 lbs | - |
| Manchester, Eric | 2B | Marquette Miners | 27 | 07/19/2014 | Hammond | USA | Left | Right | 6' 1" | 205 lbs | - |
| Martin, Donald | CF | Barton Springs Blues | 24 | 07/25/2017 | Shrewsbury | USA | Right | Right | 6' 4" | 210 lbs | - |
| Martin, Pat | CL | Squirrel Hill Pierogis | 22 | 09/19/2019 | Walpole | USA | Left | Right | 6' 5" | 225 lbs | - |
| Martínez, Jared | SP | Providence Pilgrims | 25 | 07/09/2016 | Milwaukee | USA | Left | Right | 6' 1" | 200 lbs | - |
| Matsui, Hyosuke | RP | Asheville Highlanders | 25 | 04/13/2016 | Nachikatsuura | JPN | Right | Right | 6' 3" | 200 lbs | - |
| Maxwell, Jim | RP | Ottawa Nationals | 26 | 03/28/2015 | Aiken | USA | Right | Right | 6' 4" | 200 lbs | - |
| Maynard, Roy | RF | Billings Polar Bears | 23 | 01/21/2018 | Tempe | USA | Switch | Left | 6' 6" | 220 lbs | - |
| McBride, Jeff | RP | Ottawa Nationals | 28 | 02/06/2013 | Chicago | USA | Left | Left | 6' 4" | 195 lbs | - |
| McCoy, Jesse | SS | Providence Pilgrims | 26 | 07/12/2015 | Huntington Beach | USA | Right | Right | 6' 1" | 195 lbs | - |
| McDonald, Chris | SP | Yakima Hops | 25 | 11/21/2016 | Duarte | USA | Right | Right | 6' 2" | 210 lbs | - |
| McGee, Anthony | 3B | Bethesda Atoms | 23 | 04/29/2018 | Carson City | USA | Right | Right | 6' 5" | 220 lbs | - |
| McGrady, Bobby | LF | Richland Rails | 26 | 04/29/2015 | Salisbury | USA | Left | Left | 6' 1" | 205 lbs | - |
| Mears, Mark | 3B | Asheville Highlanders | 22 | 03/14/2019 | Newburgh | USA | Left | Right | 5' 9" | 170 lbs | - |
| Medina, Manny | 1B | Bethesda Atoms | 24 | 08/21/2017 | Managua | NCA | Left | Left | 5' 10" | 195 lbs | - |
| Méndez, Gabriel | RF | Providence Pilgrims | 28 | 12/26/2013 | Curacaví | CHI | Right | Right | 6' 3" | 210 lbs | - |
| Méndez, Jesús | SS | Marquette Miners | 26 | 05/27/2015 | Bayamón | PUR | Right | Right | 6' 2" | 200 lbs | - |
| Menéndez, Carlos | RP | Billings Polar Bears | 24 | 07/31/2017 | Sixaola | CRC | Left | Left | 6' 7" | 220 lbs | - |
| Milic, Milos | 1B | Athletic Club KC Academy | 23 | 08/08/2018 | Sivacevo | BUL | Right | Right | 6' 1" | 210 lbs | - |
| Mireles, Juan | LF | Free Agent | 24 | 01/13/2017 | Mexico City | MEX | Right | Right | 6' 3" | 200 lbs | - |
| Molina, Alfredo | SP | Richland Rails | 23 | 10/22/2018 | Bogota | COL | Right | Right | 6' 2" | 185 lbs | - |
| Molina, Vicente | SP | Asheville Highlanders | 22 | 07/17/2019 | Brooklyn | USA | Right | Right | 6' 1" | 185 lbs | - |
| Molina, Wilson | SP | Bethesda Atoms | 23 | 01/02/2018 | Richfield | USA | Right | Right | 6' 2" | 185 lbs | - |
| Montgomery, Alvin | LF | Billings Polar Bears | 23 | 04/16/2018 | Mesa | USA | Left | Left | 6' 4" | 205 lbs | - |
| Morel, Franck | 1B | Squirrel Hill Pierogis | 22 | 10/28/2019 | Guérande | FRA | Right | Right | 6' 3" | 220 lbs | - |
| Moreno, António | SP | Richland Rails | 27 | 08/22/2014 | Santiago | DOM | Left | Left | 6' 6" | 210 lbs | - |
| Morris, Frank | RF | Asheville Highlanders | 26 | 01/11/2015 | Zephyrhills South | USA | Left | Left | 6' 5" | 220 lbs | - |
| Mouland, Asher | SP | Minnesota Loons | 23 | 04/09/2018 | Montreal | CAN | Right | Right | 6' 4" | 220 lbs | - |
| Moy, Jang-lu | RP | Squirrel Hill Pierogis | 24 | 07/07/2017 | Taipei | TPE | Left | Left | 6' 2" | 195 lbs | - |
| Moy, Kai-ge | SP | Yakima Hops | 25 | 10/14/2016 | Hsinchuang | TPE | Right | Right | 6' 5" | 215 lbs | - |
| Mullins, Shawn | CF | Barton Springs Blues | 25 | 05/29/2016 | Kissimmee | USA | Right | Right | 6' 0" | 190 lbs | - |
| Murphy, Ted | C | Richland Rails | 25 | 04/30/2016 | Tracy | USA | Right | Right | 5' 11" | 220 lbs | - |
