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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MacGregor, Darrell | LF | Mississippi Mockingbirds | 29 | 06/04/2021 | Monrovia | USA | Right | Right | 6' 1" | 200 lbs | $280,000 |
| MacKinder, Daniel | CF | Hollywood Shredders | 29 | 01/17/2021 | Warsop | ENG | Right | Right | 6' 2" | 200 lbs | $1,700,000 |
| Macías, António | 3B | Mississippi Mockingbirds | 31 | 02/22/2019 | San Nicolas | CRC | Right | Right | 6' 1" | 195 lbs | $19,000,000 |
| Madrid, Ramón | 2B | Free Agent | 21 | 08/30/2029 | Torrance | USA | Switch | Right | 5' 9" | 165 lbs | - |
| Mamchenko, Sasha | RF | San Mateo Dirty Reds | 22 | 05/01/2028 | Baranchinskiy | RUS | Left | Left | 6' 3" | 185 lbs | $280,000 |
| Maneilli, Gian-Carlo | SP | Hollywood Shredders | 27 | 10/14/2023 | Caracas | VEN | Switch | Right | 6' 6" | 200 lbs | $500,000 |
| Mann, Hugh | RP | Northern Virginia Rainbow Mermaids | 25 | 06/13/2025 | Columbus | USA | Right | Right | 6' 0" | 190 lbs | $280,000 |
| Mansilha, Marços | C | Nova Scotia Leviathan | 29 | 09/06/2021 | Jequié | BRA | Switch | Right | 6' 3" | 200 lbs | $19,800,000 |
| March, Conor | SP | Athletic Club KC | 27 | 02/12/2023 | Edmonton | CAN | Right | Right | 6' 0" | 195 lbs | $870,000 |
| Marley, Daniel | RF | Buffalo White Walkers | 29 | 03/28/2021 | Bath | ENG | Right | Right | 6' 4" | 200 lbs | $16,000,000 |
| Martínez, Alfredo | SS | Mississippi Mockingbirds | 16 | 12/07/2034 | Barranca | PER | Switch | Right | 6' 1" | 170 lbs | - |
| Martínez, Francisco | RP | Free Agent | 18 | 02/27/2032 | Pullman | USA | Left | Left | 6' 9" | 200 lbs | - |
| Martínez, Jorge | SS | San Mateo Dirty Reds | 25 | 06/26/2025 | Ipís | CRC | Right | Right | 6' 2" | 180 lbs | $280,000 |
| Mason, Alan | RP | Mississippi Mockingbirds | 35 | 07/02/2015 | Wheeling | USA | Left | Right | 6' 3" | 220 lbs | $700,000 |
| Matos, Juan Luis | RP | Buffalo White Walkers | 28 | 12/26/2022 | San Andrés | GUA | Switch | Right | 6' 2" | 200 lbs | $8,125,000 |
| McCusker, Jack | CF | Hollywood Shredders | 31 | 03/03/2019 | Newark | USA | Left | Left | 6' 4" | 200 lbs | $700,000 |
| Mendoza, Vicente | C | Nova Scotia Leviathan | 27 | 11/04/2023 | Tegucigalpa | HON | Right | Right | 6' 4" | 200 lbs | $280,000 |
| Menéndez, Armando | SP | Athletic Club KC | 17 | 11/15/2033 | Nueva San Salvador | SLV | Left | Right | 6' 2" | 180 lbs | - |
| Meyers, Jeffery | CL | Hollywood Shredders | 35 | 03/07/2015 | Manchester Center | USA | Left | Left | 6' 1" | 200 lbs | $14,200,000 |
| Michel, Erwan | 2B | Mississippi Mockingbirds | 29 | 08/05/2021 | Saint-Just | FRA | Right | Right | 6' 3" | 200 lbs | $280,000 |
| Milatovic, Boris | RP | Mississippi Mockingbirds | 30 | 06/24/2020 | Asenovgrad | BUL | Right | Right | 5' 10" | 180 lbs | $5,750,000 |
| Milliken, David | 2B | Buffalo White Walkers | 35 | 10/22/2015 | Cody | USA | Right | Right | 6' 2" | 220 lbs | $700,000 |
| Miniato, Costanzo | SP | Mississippi Mockingbirds | 29 | 08/05/2021 | Bellizzi | ITA | Right | Right | 6' 3" | 195 lbs | $700,000 |
| Mitchell, Bill | RP | Northern Virginia Rainbow Mermaids | 25 | 11/14/2025 | Eau Claire | USA | Left | Right | 6' 0" | 195 lbs | $280,000 |
| Mndoyants, Tosya | SS | Athletic Club KC | 28 | 10/16/2022 | Gorelki | RUS | Switch | Right | 6' 4" | 200 lbs | $17,000,000 |
| Moonfall, Colton | SP | New Orleans Voodoo | 31 | 01/08/2019 | Killeen | USA | Right | Right | 6' 1" | 200 lbs | $14,000,000 |
| Morales, Roberto | CL | Colorado Billy Goats | 30 | 07/21/2020 | San Felipe | CRC | Right | Right | 6' 8" | 225 lbs | $3,500,000 |
| Morgan, Travis | SP | Greenville 84s | 36 | 11/12/2014 | Deltona | USA | Switch | Right | 6' 0" | 195 lbs | $2,400,000 |
| Morín, Miguel | C | Greenville 84s | 25 | 08/06/2025 | Santo Domingo | DOM | Left | Right | 6' 2" | 200 lbs | $280,000 |
| Murphy, Sean | SP | Northern Virginia Rainbow Mermaids | 30 | 02/27/2020 | Tempe | USA | Right | Right | 6' 6" | 205 lbs | $280,000 |
| Muñóz, Júlio | 2B | Free Agent | 27 | 10/25/2023 | Los Teques | VEN | Right | Right | 6' 0" | 200 lbs | - |
| Møller, Johan | SS | Athletic Club KC | 24 | 07/26/2026 | Aasiaat | GRL | Right | Right | 6' 1" | 185 lbs | $280,000 |
