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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MacDougal, Steve | SP | Hamilton Thunderbirds | 29 | 06/25/2022 | Millington | USA | Right | Right | 6' 0" | 190 lbs | - |
| MacGregor, Michael | SP | Sioux Falls Red Pandas | 27 | 02/11/2024 | Woodbridge | USA | Right | Right | 6' 6" | 200 lbs | $280,000 |
| Mae, Haechan | 2B | Calgary Lynx | 32 | 04/03/2019 | Sinpo | PRK | Right | Right | 6' 4" | 200 lbs | $280,000 |
| Mancebo, Jesús | C | Plymouth Rocks | 32 | 06/09/2019 | Ocós | GUA | Right | Right | 5' 11" | 195 lbs | - |
| Martin, Doug | RP | Plymouth Rocks | 25 | 02/20/2026 | East Rutherford | USA | Right | Right | 6' 2" | 210 lbs | $280,000 |
| Martínez, Júlio | RP | Calgary Lynx | 24 | 12/21/2027 | Queens | USA | Switch | Right | 5' 10" | 185 lbs | $280,000 |
| Martínez, Luis | 1B | Vermont Lake Monsters | 26 | 06/08/2025 | San Diego | USA | Right | Right | 6' 2" | 200 lbs | - |
| Martínez, Raúl | RP | Hamilton Thunderbirds | 29 | 05/02/2022 | Freeport | USA | Right | Right | 5' 10" | 200 lbs | $280,000 |
| Mascola, Lance | RP | Free Agent | 34 | 07/30/2017 | Slaton | USA | Right | Right | 6' 6" | 220 lbs | - |
| Mata, Armando | SP | Nashville Hot Chickens | 29 | 03/14/2022 | Antioquia | COL | Right | Left | 6' 2" | 200 lbs | - |
| McBride, Bake | CF | Ellenburg Fighting Dachshunds | 26 | 08/30/2025 | Plant City | USA | Right | Right | 6' 0" | 190 lbs | - |
| McCall, Marvin | RP | Plymouth Rocks | 25 | 01/14/2026 | Opelousas | USA | Switch | Right | 6' 4" | 200 lbs | - |
| McClellan, Robbie | SS | Free Agent | 29 | 05/02/2022 | West Jordan | USA | Right | Right | 6' 4" | 200 lbs | - |
| McDonald, Jeff | 2B | Ellenburg Fighting Dachshunds | 25 | 08/08/2026 | Cleveland | USA | Right | Right | 5' 10" | 175 lbs | - |
| McDonald, Ralph | RF | Port Huron Blitzkrieg | 25 | 02/18/2026 | Wichita | USA | Left | Left | 6' 1" | 185 lbs | - |
| McGinnity, Darwin | SP | Port Huron Blitzkrieg | 31 | 03/04/2020 | Winona | USA | Right | Right | 6' 3" | 200 lbs | - |
| McGruffin, Ruff | 1B | Free Agent | 29 | 06/28/2022 | Mountain Top | USA | Left | Left | 6' 2" | 200 lbs | - |
| McIntyre, Dan | SP | Hamilton Thunderbirds | 26 | 01/13/2025 | Palmview South | USA | Left | Right | 6' 0" | 200 lbs | $280,000 |
| Medina, José | RP | Sioux Falls Red Pandas | 26 | 05/06/2025 | Concepción | CHI | Switch | Right | 5' 11" | 180 lbs | - |
| Medrano, Jim | RF | Ellenburg Fighting Dachshunds | 28 | 08/23/2023 | Charlottesville | USA | Left | Left | 6' 2" | 200 lbs | $280,000 |
| Meierhold, Vladsislas | CL | Pawnee ParksNRec | 29 | 05/28/2022 | Penza | RUS | Right | Right | 6' 2" | 185 lbs | $280,000 |
| Mendoza, Tony | LF | Nashville Hot Chickens | 28 | 02/17/2023 | Miami Lakes | USA | Right | Right | 6' 3" | 200 lbs | $280,000 |
| Millon, Marvello | 3B | Pawnee ParksNRec | 24 | 08/02/2027 | Manila | PHI | Right | Right | 6' 4" | 205 lbs | - |
| Miura, Tatsuya | C | Port Royal Disaster | 30 | 03/15/2021 | Kitakyushu | JPN | Right | Right | 6' 0" | 215 lbs | $280,000 |
| Monteblanco, Luis Miguel | RF | Plymouth Rocks | 30 | 06/02/2021 | Havana | CUB | Right | Right | 6' 0" | 200 lbs | $280,000 |
| Montgomery, Todd | SP | Port Huron Blitzkrieg | 27 | 01/02/2024 | Sylvania | USA | Right | Right | 6' 4" | 205 lbs | - |
| Montoya, Pablo | SP | Port Huron Blitzkrieg | 29 | 05/17/2022 | Guaynabo | PUR | Right | Right | 6' 4" | 195 lbs | - |
| Montáñez, Félix | SP | Ellenburg Fighting Dachshunds | 26 | 09/12/2025 | Bremerton | USA | Right | Right | 6' 4" | 200 lbs | $280,000 |
| Montáñez, Luis | RP | Port Huron Blitzkrieg | 25 | 07/27/2026 | Philadelphia | USA | Left | Right | 6' 2" | 190 lbs | - |
| Montés, Jaime | CF | Free Agent | 32 | 05/25/2019 | Constitución | CHI | Right | Right | 6' 2" | 200 lbs | - |
| Moore, Marvin | 3B | Florida Men | 28 | 06/03/2023 | Sanatoga | USA | Left | Right | 6' 3" | 200 lbs | $280,000 |
| Moore, William | 2B | Ellenburg Fighting Dachshunds | 29 | 12/07/2022 | Omaha | USA | Right | Right | 5' 10" | 200 lbs | - |
| Morales, Alfredo | SP | Calgary Lynx | 30 | 10/18/2021 | San Rafael Abajo | CRC | Left | Left | 6' 2" | 200 lbs | - |
| Morales, Edgar | SP | Free Agent | 32 | 12/20/2019 | Concord | USA | Switch | Left | 6' 3" | 200 lbs | - |
| Morales, Lorenzo | CF | Hamilton Thunderbirds | 28 | 04/16/2023 | Virginia Beach | USA | Right | Right | 5' 11" | 200 lbs | - |
| Morgan, Travis | SP | Hartford Pride | 37 | 11/12/2014 | Deltona | USA | Switch | Right | 6' 0" | 200 lbs | $280,000 |
| Morrison, Garth | LF | Pawnee ParksNRec | 27 | 09/04/2024 | Clarendon | USA | Right | Right | 5' 10" | 190 lbs | - |
| Mullinger, Martin | 1B | Calgary Lynx | 29 | 05/25/2022 | Heswall | ENG | Right | Right | 6' 2" | 205 lbs | - |
| Myers, Greg | CF | Florida Men | 24 | 12/14/2027 | Charles City | USA | Right | Right | 6' 2" | 190 lbs | - |
| Márquez, Rafael | SP | Free Agent | 31 | 01/18/2020 | San Lorenzo | PUR | Switch | Right | 6' 2" | 215 lbs | - |
| Méndez, Matt | RF | Plymouth Rocks | 35 | 07/06/2016 | Oak Ridge | USA | Right | Right | 5' 9" | 195 lbs | $700,000 |
