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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Macías, Diego | SP | Buffalo White Walkers | 18 | 08/19/2035 | San Antonio de Desamparados | CRC | Left | Left | 6' 1" | 180 lbs | - |
| Mamchenko, Sasha | RF | Buffalo White Walkers | 25 | 05/01/2028 | Baranchinskiy | RUS | Left | Left | 6' 3" | 200 lbs | $280,000 |
| Manalo, Marvello | SP | Panama City Piranhas | 30 | 06/20/2023 | Anuling | PHI | Switch | Right | 5' 11" | 185 lbs | $10,050,000 |
| Manley, John | C | Free Agent | 31 | 01/24/2022 | Jasper | USA | Left | Right | 6' 2" | 205 lbs | - |
| Mann, Hugh | SP | Montana Pandas | 28 | 06/13/2025 | Columbus | USA | Right | Right | 6' 0" | 190 lbs | $850,000 |
| Mansilha, Marços | C | Mississippi Mockingbirds | 32 | 09/06/2021 | Jequié | BRA | Switch | Right | 6' 3" | 200 lbs | $14,000,000 |
| March, Conor | SP | Athletic Club KC | 30 | 02/12/2023 | Edmonton | CAN | Right | Right | 6' 0" | 195 lbs | $12,100,000 |
| Martínez, Francisco | SP | Free Agent | 21 | 02/27/2032 | Pullman | USA | Left | Left | 6' 9" | 200 lbs | - |
| Martínez, Jorge | SS | Free Agent | 28 | 06/26/2025 | Ipís | CRC | Right | Right | 6' 2" | 185 lbs | - |
| Mason, Eric | RP | Greenville 84s | 35 | 12/14/2018 | Bakersfield | USA | Right | Right | 6' 3" | 200 lbs | $280,000 |
| Matos, Javier | C | Athletic Club KC | 16 | 01/14/2037 | Temuco | CHI | Left | Right | 6' 2" | 185 lbs | - |
| Matos, Juan Luis | RP | Buffalo White Walkers | 31 | 12/26/2022 | San Andrés | GUA | Switch | Right | 6' 2" | 195 lbs | $8,000,000 |
| Matsumoto, Tetsu | 3B | Athletic Club KC | 37 | 11/04/2016 | Tokyo | JPN | Switch | Right | 6' 1" | 200 lbs | $16,700,000 |
| McCord, Richard | RP | Pittsburgh Kingfishers | 28 | 03/17/2025 | Newport News | USA | Switch | Left | 6' 8" | 200 lbs | $280,000 |
| McFadden, Kenny | CL | Montana Pandas | 32 | 02/20/2021 | Manhattan | USA | Right | Right | 6' 1" | 190 lbs | $7,600,000 |
| McLean, George | RF | San Mateo Dirty Reds | 32 | 11/10/2021 | South Miami | USA | Left | Left | 6' 2" | 195 lbs | $280,000 |
| Mejía, Alonso | SP | Mississippi Mockingbirds | 16 | 03/10/2037 | San Pedro de Macorís | DOM | Right | Right | 6' 8" | 200 lbs | - |
| Melanson, Jon | SS | San Mateo Dirty Reds | 27 | 06/05/2026 | Toronto | CAN | Left | Right | 6' 5" | 200 lbs | $280,000 |
| Mendoza, Carlos | SP | Greenville 84s | 16 | 11/19/2037 | San Ignacio | BLZ | Right | Left | 6' 2" | 175 lbs | - |
| Meyers, Jeffery | CL | Pittsburgh Kingfishers | 38 | 03/07/2015 | Manchester Center | USA | Left | Left | 6' 1" | 200 lbs | $11,000,000 |
| Michel, Erwan | 2B | Free Agent | 32 | 08/05/2021 | Saint-Just | FRA | Right | Right | 6' 3" | 200 lbs | - |
| Miller, Al | C | Athletic Club KC | 29 | 06/23/2024 | Carmel | USA | Switch | Right | 6' 3" | 200 lbs | $1,150,000 |
| Miller, Stephan | C | Montana Pandas | 16 | 08/12/2037 | San Antonio | NMI | Right | Right | 6' 0" | 190 lbs | - |
| Miniato, Costanzo | SP | Mississippi Mockingbirds | 32 | 08/05/2021 | Bellizzi | ITA | Right | Right | 6' 3" | 190 lbs | $700,000 |
| Mirrin, Kaula | SP | San Mateo Dirty Reds | 16 | 04/26/2037 | Koror | PAU | Left | Left | 6' 2" | 175 lbs | - |
| Mo, Yuan | DH | New Orleans Voodoo | 24 | 01/03/2029 | Chiayi | TPE | Switch | Left | 6' 6" | 200 lbs | $280,000 |
| Molina, Vicente | SP | Panama City Piranhas | 34 | 07/17/2019 | Brooklyn | USA | Right | Right | 6' 1" | 200 lbs | $6,000,000 |
| Montgomery, Lee | SS | San Mateo Dirty Reds | 31 | 12/05/2022 | Miami | USA | Right | Right | 6' 0" | 190 lbs | $280,000 |
| Moore, Charlie | CF | New Orleans Voodoo | 31 | 08/31/2022 | New York | USA | Left | Left | 6' 3" | 200 lbs | $280,000 |
| Moore, Dennis | 1B | Montana Pandas | 30 | 07/05/2023 | Mt. Vernon | USA | Left | Left | 6' 1" | 200 lbs | $16,400,000 |
| Morales, Luis | SP | San Mateo Dirty Reds | 16 | 03/29/2037 | Puerto Cortés | CRC | Left | Left | 6' 4" | 190 lbs | - |
| Morales, Roberto | RP | Panama City Piranhas | 33 | 07/21/2020 | San Felipe | CRC | Right | Right | 6' 8" | 225 lbs | $4,240,000 |
| Morín, Miguel | C | Greenville 84s | 28 | 08/06/2025 | Santo Domingo | DOM | Left | Right | 6' 2" | 200 lbs | $1,400,000 |
| Muñóz, António | SS | Mississippi Mockingbirds | 16 | 11/29/2037 | La Guaira | VEN | Right | Right | 6' 3" | 170 lbs | - |
| Møller, Johan | SS | Free Agent | 27 | 07/26/2026 | Aasiaat | GRL | Right | Right | 6' 1" | 190 lbs | - |
