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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Maldonado, Roberto | RP | Lake Minnetonka Love Boats | 28 | 07/24/2012 | Caracas | VEN | Right | Right | 6' 4" | 200 lbs | - |
| Martínez, Eric | C | Lake Minnetonka Love Boats | 27 | 07/05/2013 | La Habra | USA | Right | Right | 6' 0" | 210 lbs | - |
| Martínez, Jorge | CL | Crescent City Krewe | 26 | 03/17/2014 | Conroe | USA | Left | Left | 6' 0" | 185 lbs | - |
| Martínez, José | SP | Westwood Sixshooters | 27 | 07/29/2013 | Los Palacios | CUB | Left | Left | 6' 2" | 200 lbs | - |
| Mason, Eric | CL | Olympia Ogres | 22 | 12/14/2018 | Bakersfield | USA | Right | Right | 6' 3" | 205 lbs | - |
| Massingham, Sterling | SS | Westwood Sixshooters | 25 | 11/26/2015 | Sydney | AUS | Right | Right | 6' 3" | 195 lbs | - |
| Matos, Luis | RP | Ithaca Fighting Imps | 26 | 01/06/2014 | Tulsa | USA | Left | Left | 6' 0" | 185 lbs | - |
| Matthews, Tom | 3B | Virginia Palladium Sox | 28 | 04/10/2012 | Brooklyn | USA | Right | Right | 5' 11" | 180 lbs | - |
| McElroy, Charles | RP | Mercer Island Screaming Eagles | 21 | 10/25/2019 | Margate | USA | Right | Right | 6' 3" | 185 lbs | - |
| McIntosh, Clinton | SP | Chesapeake Continentals | 25 | 07/12/2015 | Carmel | USA | Right | Left | 5' 10" | 180 lbs | - |
| McJannett, Donald | RF | Ithaca Fighting Imps | 27 | 08/29/2013 | South Bend | USA | Left | Left | 6' 0" | 205 lbs | - |
| Mejía, Jorge | CF | Olympia Ogres | 22 | 12/24/2018 | North Atlanta | USA | Left | Left | 6' 1" | 190 lbs | - |
| Melin, Kristoffer | LF | Crescent City Krewe | 28 | 04/16/2012 | Tampere | FIN | Right | Right | 6' 2" | 200 lbs | - |
| Melis, Pjotr | SP | Westwood Sixshooters | 28 | 04/26/2012 | Sint Nicolas | ARU | Right | Right | 6' 2" | 195 lbs | - |
| Mihalushkin, Adrik | SP | Mercer Island Screaming Eagles | 26 | 10/17/2014 | St. Petersburg | RUS | Left | Left | 6' 3" | 205 lbs | - |
| Miller, Jason | SP | Mercer Island Screaming Eagles | 22 | 02/25/2018 | Lawton | USA | Switch | Right | 5' 9" | 175 lbs | - |
| Miller, Lawrence | CF | Olympia Ogres | 24 | 12/07/2016 | Reminderville | USA | Right | Left | 6' 2" | 205 lbs | - |
| Mireles, Ricardo | RF | Virginia Palladium Sox | 27 | 03/01/2013 | San Pedro de Macorís | DOM | Right | Right | 6' 2" | 210 lbs | $280,000 |
| Miyata, Tetsuzan | RP | Virginia Palladium Sox | 26 | 05/11/2014 | Koriyama | JPN | Right | Right | 6' 2" | 200 lbs | - |
| Mona, Bharti | RF | Mercer Island Screaming Eagles | 22 | 01/18/2018 | Bhiwandi | IND | Left | Left | 6' 3" | 185 lbs | - |
| Morgan, Marcus | SP | Crescent City Krewe | 24 | 05/21/2016 | Spanish Town | JAM | Right | Right | 6' 9" | 225 lbs | - |
| Morgan, Mark | RP | Crescent City Krewe | 28 | 11/26/2012 | Jefferson | USA | Left | Left | 6' 0" | 185 lbs | $280,000 |
| Morterero, António | RP | Ft. Polk South Thunder Hawks | 24 | 05/08/2016 | Quillón | CHI | Right | Left | 6' 7" | 220 lbs | - |
| Muijlwijk, Riccardo | RP | Chesapeake Continentals | 24 | 04/02/2016 | Willemstad | CUR | Left | Left | 6' 3" | 185 lbs | - |
| Muñóz, Jorge | SS | Crescent City Krewe | 22 | 11/11/2018 | Maracaibo | VEN | Right | Right | 6' 2" | 185 lbs | - |
| Muñóz, Pedro | CF | Mercer Island Screaming Eagles | 23 | 05/02/2017 | Tinley Park | USA | Left | Right | 6' 4" | 200 lbs | - |
| Murciano, León | C | Lake Minnetonka Love Boats | 22 | 09/02/2018 | Medellín | COL | Right | Right | 6' 4" | 205 lbs | - |
