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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MacKey, Coy | 1B | Toledo Saboteurs | 25 | 10/26/2017 | Missoula | USA | Right | Right | 6' 2" | 240 lbs | - |
| MacKinder, Daniel | CF | Virginia Beach Whales | 21 | 01/17/2021 | Warsop | ENG | Right | Right | 6' 2" | 185 lbs | $280,000 |
| Mansvelt, Remco | SP | Virginia Beach Whales | 26 | 11/16/2016 | Willemstad | CUR | Left | Left | 6' 2" | 195 lbs | - |
| Marroquín, Héctor | SP | St. Petersburg Thunder | 29 | 11/23/2013 | Santo Domingo | DOM | Right | Right | 6' 0" | 180 lbs | - |
| Martínez, Jared | SP | Providence Pilgrims | 26 | 07/09/2016 | Milwaukee | USA | Left | Right | 6' 1" | 200 lbs | - |
| Maxwell, Jim | RP | Ottawa Nationals | 27 | 03/28/2015 | Aiken | USA | Right | Right | 6' 4" | 200 lbs | - |
| McBride, Chris | 3B | Toledo Saboteurs | 29 | 11/06/2013 | Phenix City | USA | Right | Right | 6' 0" | 215 lbs | - |
| McCoy, Jesse | SS | Providence Pilgrims | 27 | 07/12/2015 | Huntington Beach | USA | Right | Right | 6' 1" | 205 lbs | - |
| McQueen, Stephen | RP | Biloxi Shuckers | 21 | 01/03/2021 | Rosenberg | USA | Right | Right | 6' 2" | 190 lbs | - |
| Méndez, Gabriel | RF | Providence Pilgrims | 29 | 12/26/2013 | Curacaví | CHI | Right | Right | 6' 3" | 215 lbs | - |
| Méndez, Juan | 2B | Biloxi Shuckers | 21 | 06/27/2021 | San Joaquín | VEN | Right | Right | 6' 3" | 190 lbs | - |
| Mesa, Arturo | SP | Atlantic City Sonics | 28 | 09/24/2014 | Valencia | VEN | Right | Right | 6' 1" | 205 lbs | - |
| Middleton, Jason | 3B | Biloxi Shuckers | 23 | 07/08/2019 | Wichita | USA | Right | Right | 6' 2" | 190 lbs | - |
| Miniato, Costanzo | SP | Biloxi Shuckers | 21 | 08/05/2021 | Bellizzi | ITA | Right | Right | 6' 3" | 180 lbs | - |
| Miranda, Raúl | LF | Lancaster Farmers | 23 | 12/14/2019 | Caracas | VEN | Switch | Right | 6' 4" | 210 lbs | - |
| Miyata, Tetsuzan | RP | Toledo Saboteurs | 28 | 05/11/2014 | Koriyama | JPN | Right | Right | 6' 2" | 205 lbs | - |
| Moore, Curt | CL | St. Petersburg Thunder | 28 | 12/08/2014 | Florence-Roebling | USA | Left | Left | 6' 1" | 195 lbs | - |
| Moore, Randy | CF | Biloxi Shuckers | 22 | 07/10/2020 | Oceanside | USA | Right | Right | 6' 2" | 175 lbs | - |
| Mora, Fernando | RP | Atlantic City Sonics | 24 | 10/14/2018 | La Vega | DOM | Left | Left | 6' 1" | 190 lbs | - |
| Morales, Edgar | SP | Ottawa Nationals | 23 | 12/20/2019 | Concord | USA | Switch | Left | 6' 3" | 210 lbs | - |
| Moreau, Vincent | RP | Virginia Beach Whales | 28 | 12/21/2014 | Saint-Marc | HAI | Right | Right | 6' 4" | 210 lbs | - |
| Morterero, Pablo | C | Biloxi Shuckers | 22 | 09/16/2020 | Caracas | VEN | Right | Right | 6' 4" | 210 lbs | - |
| Mugglestone, Dylan | RP | Lancaster Farmers | 23 | 09/28/2019 | London | ENG | Left | Left | 6' 1" | 190 lbs | - |
