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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MacColl, Emery | 3B | Santa Barbara Golden Cranes | 26 | 11/28/2023 | Merced | USA | Right | Right | 5' 11" | 200 lbs | - |
| MacGlasrich, Bill | CF | Sunset District Fog | 22 | 01/11/2027 | Garden City | USA | Left | Left | 6' 0" | 185 lbs | - |
| MacGregor, Michael | SP | Sioux Falls Red Pandas | 25 | 02/11/2024 | Woodbridge | USA | Right | Right | 6' 6" | 200 lbs | $280,000 |
| Magee, Aubrey | RF | Monongahela Monsters | 29 | 04/24/2020 | Sterling Heights | USA | Switch | Right | 6' 4" | 205 lbs | - |
| Marino, Ramón | 3B | Monongahela Monsters | 25 | 02/28/2024 | Cardenas | CUB | Switch | Right | 6' 0" | 195 lbs | - |
| Martin, Pat | RP | Free Agent | 30 | 09/19/2019 | Walpole | USA | Left | Right | 6' 5" | 215 lbs | - |
| Martínez, Rodrigo | CF | Ellenburg Fighting Dachsunds | 27 | 04/26/2022 | Grand Prairie | USA | Right | Left | 5' 11" | 195 lbs | - |
| Martínez, Sam | RP | Hamilton Coyotes | 28 | 11/11/2021 | Indianapolis | USA | Right | Right | 6' 4" | 200 lbs | $440,000 |
| Mascola, Lance | RP | Sioux Falls Red Pandas | 32 | 07/30/2017 | Slaton | USA | Right | Right | 6' 6" | 225 lbs | - |
| May, Nathan | RP | Monongahela Monsters | 26 | 09/26/2023 | Front Royal | USA | Right | Right | 6' 3" | 195 lbs | $280,000 |
| McBride, Bake | CF | Ellenburg Fighting Dachsunds | 24 | 08/30/2025 | Plant City | USA | Right | Right | 6' 0" | 180 lbs | - |
| McCoy, Carl | RP | Monongahela Monsters | 25 | 06/26/2024 | Akron | USA | Switch | Right | 5' 10" | 180 lbs | $280,000 |
| McDonald, Ronald | RP | Sioux Falls Red Pandas | 28 | 02/21/2021 | Dix Hills | USA | Right | Right | 6' 1" | 200 lbs | $280,000 |
| McIntyre, Dan | SP | Hamilton Coyotes | 24 | 01/13/2025 | Palmview South | USA | Left | Right | 6' 0" | 195 lbs | - |
| McLeod, Ryan | LF | Santa Barbara Golden Cranes | 27 | 02/06/2022 | Leon Valley | USA | Right | Left | 6' 1" | 195 lbs | - |
| McNeil, Nelson | SP | Santa Barbara Golden Cranes | 25 | 02/22/2024 | North Atlanta | USA | Right | Right | 6' 2" | 195 lbs | $280,000 |
| Mears, Mark | DH | Milton Dogfish Head | 30 | 03/14/2019 | Newburgh | USA | Left | Right | 5' 9" | 185 lbs | $280,000 |
| Medina, Alfonso | RP | Pawnee ParksNRec | 28 | 05/12/2021 | San Antonio Ilotenango | GUA | Right | Right | 6' 0" | 185 lbs | $280,000 |
| Medrano, Jim | RF | Ellenburg Fighting Dachsunds | 26 | 08/23/2023 | Charlottesville | USA | Left | Left | 6' 2" | 200 lbs | - |
| Messer, Jacob | RP | Free Agent | 33 | 06/08/2016 | Saratoga Springs | USA | Right | Right | 6' 8" | 215 lbs | - |
| Michielsen, Hildebrand | SP | Sioux Falls Red Pandas | 35 | 07/27/2014 | Princess Quarter | SIM | Left | Left | 6' 5" | 200 lbs | - |
| Miller, Ron | C | Nolensville Knights | 24 | 01/03/2025 | Bakersfield | USA | Right | Right | 6' 0" | 200 lbs | - |
| Minor, Ralph | RP | Sioux Falls Red Pandas | 33 | 07/24/2016 | Southlake | USA | Switch | Right | 6' 2" | 200 lbs | - |
| Montáñez, Félix | SP | Ellenburg Fighting Dachsunds | 24 | 09/12/2025 | Bremerton | USA | Right | Right | 6' 4" | 200 lbs | - |
| Montés, Dave | SS | Monongahela Monsters | 27 | 11/15/2022 | South Hill | USA | Right | Right | 6' 2" | 200 lbs | - |
| Moon, Wally | SP | Pawnee ParksNRec | 28 | 06/04/2021 | Brooklyn | USA | Right | Right | 6' 4" | 205 lbs | - |
| Mooney, David | 2B | Port Royal Disaster | 30 | 10/13/2019 | Chicago | USA | Right | Right | 6' 4" | 200 lbs | $280,000 |
| Moore, Howard | C | Florida Men | 25 | 02/26/2024 | West Odessa | USA | Right | Right | 6' 1" | 200 lbs | - |
| Moore, Marvin | 3B | Florida Men | 26 | 06/03/2023 | Sanatoga | USA | Left | Right | 6' 3" | 200 lbs | - |
| Moore, Randy | CF | Hamilton Coyotes | 29 | 07/10/2020 | Oceanside | USA | Right | Right | 6' 2" | 195 lbs | - |
| Moore, Tommy | RP | Monongahela Monsters | 27 | 05/12/2022 | Kailua (Hawai'i County) | USA | Right | Right | 6' 4" | 200 lbs | - |
| Moran, Kevin | RP | Nolensville Knights | 29 | 02/08/2020 | Livonia | USA | Right | Right | 6' 2" | 200 lbs | - |
| Morel, Franck | 1B | Monongahela Monsters | 30 | 10/28/2019 | Guérande | FRA | Right | Right | 6' 3" | 230 lbs | $280,000 |
| Moreno, Cristián | SP | Sioux Falls Red Pandas | 38 | 10/27/2011 | Granadilla | CRC | Right | Right | 6' 0" | 210 lbs | $790,000 |
| Morgan, Marcus | RP | Nolensville Knights | 33 | 05/21/2016 | Spanish Town | JAM | Right | Right | 6' 9" | 215 lbs | - |
| Morrison, Garth | CF | Pawnee ParksNRec | 25 | 09/04/2024 | Clarendon | USA | Right | Right | 5' 10" | 185 lbs | - |
| Morse, Ethan | RP | Hamilton Coyotes | 24 | 04/03/2025 | Somerset | USA | Right | Right | 6' 2" | 200 lbs | - |
| Moy, Jang-lu | RP | Nolensville Knights | 32 | 07/07/2017 | Taipei | TPE | Left | Left | 6' 2" | 205 lbs | - |
| Mullins, Bud | CF | Ellenburg Fighting Dachsunds | 30 | 02/27/2019 | Manhattan | USA | Right | Right | 6' 1" | 195 lbs | - |
| Murray, Jim | SP | Santa Barbara Golden Cranes | 28 | 03/10/2021 | Setauket-East Setauket | USA | Right | Right | 5' 11" | 200 lbs | $280,000 |
| Márquez, Rafael | RP | Florida Men | 29 | 01/18/2020 | San Lorenzo | PUR | Switch | Right | 6' 2" | 215 lbs | - |
| Méndez, Ricardo | SP | Sunset District Fog | 23 | 01/29/2026 | Los Angeles | USA | Right | Right | 6' 2" | 190 lbs | - |
