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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MacGrewar, Mark | CF | Ithaca Fighting Imps | 22 | 09/29/2026 | Rancho Palos Verdes | USA | Right | Right | 6' 2" | 195 lbs | - |
| Magee, Aubrey | RF | Squirrel Hill Pierogis | 28 | 04/24/2020 | Sterling Heights | USA | Switch | Right | 6' 4" | 200 lbs | $280,000 |
| Mallaganee, Teriieroo | 2B | Bethesda Atoms | 21 | 09/25/2027 | Tafuna | ASA | Right | Right | 6' 4" | 190 lbs | - |
| Marino, Ramón | 3B | Squirrel Hill Pierogis | 24 | 02/28/2024 | Cardenas | CUB | Switch | Right | 6' 0" | 190 lbs | - |
| Marquis, José | RP | Gwinnett Guinea Pigs | 23 | 12/27/2025 | Santiago | DOM | Right | Right | 6' 4" | 190 lbs | - |
| Martin, Brian | C | Free Agent | 29 | 10/27/2019 | Queens | USA | Right | Right | 6' 2" | 200 lbs | - |
| Martin, Joey | RP | Bethesda Atoms | 22 | 09/10/2026 | Orlando | USA | Right | Right | 6' 1" | 200 lbs | - |
| Martínez, Albert | SS | Squirrel Hill Pierogis | 25 | 12/16/2023 | Spokane | USA | Right | Right | 6' 0" | 185 lbs | - |
| Martínez, Armando | C | Ithaca Fighting Imps | 26 | 06/25/2022 | David | PAN | Left | Right | 6' 1" | 205 lbs | - |
| Martínez, Carlos | RP | Bethesda Atoms | 23 | 12/17/2025 | Santo Domingo | DOM | Right | Right | 6' 2" | 180 lbs | - |
| Martínez, Robinson | RP | Barton Springs Blues | 28 | 04/26/2020 | Tipitapa | NCA | Left | Left | 6' 2" | 200 lbs | - |
| Mayes, George | C | Gwinnett Guinea Pigs | 25 | 10/20/2023 | Spokane | USA | Left | Right | 6' 4" | 215 lbs | - |
| Mayes, Jack | CF | Squirrel Hill Pierogis | 26 | 02/06/2022 | Buffalo | USA | Right | Right | 6' 1" | 195 lbs | - |
| McCarthy, Gil | SP | Providence Pilgrims | 24 | 07/18/2024 | Los Angeles | USA | Switch | Right | 6' 1" | 195 lbs | - |
| McGee, Chris | SP | Squirrel Hill Pierogis | 25 | 01/07/2023 | Northview | USA | Left | Left | 6' 7" | 200 lbs | - |
| McGinnity, Darwin | SP | Toledo Saboteurs | 28 | 03/04/2020 | Winona | USA | Right | Right | 6' 3" | 200 lbs | - |
| McKee, Dusty | SP | Providence Pilgrims | 23 | 03/03/2025 | Long View | USA | Left | Left | 6' 4" | 195 lbs | - |
| Medina, José | RP | Billings Polar Bears | 23 | 05/06/2025 | Concepción | CHI | Switch | Right | 5' 11" | 175 lbs | - |
| Middleton, Walt | SP | Chesapeake Cangrejos Fantasmas | 22 | 03/26/2026 | Tulsa | USA | Right | Left | 6' 2" | 190 lbs | - |
| Mills, Dave | SP | Barton Springs Blues | 28 | 06/20/2020 | Palatine | USA | Right | Right | 6' 6" | 220 lbs | - |
| Monje, Edgardo | LF | Akron Blimps | 24 | 08/26/2024 | Lincoln | USA | Left | Left | 6' 2" | 200 lbs | - |
| Monnet, Alain | RP | Akron Blimps | 23 | 07/05/2025 | Bonchamp-lès-Laval | FRA | Right | Right | 6' 2" | 180 lbs | - |
| Montoya, Pablo | SP | Toledo Saboteurs | 26 | 05/17/2022 | Guaynabo | PUR | Right | Right | 6' 4" | 200 lbs | - |
| Moon, Will | CF | Barton Springs Blues | 19 | 06/01/2029 | Tulsa | USA | Right | Right | 5' 11" | 165 lbs | - |
| Moore, Al | SP | Akron Blimps | 23 | 02/15/2025 | Melrose Park | USA | Right | Right | 6' 6" | 215 lbs | - |
| Morehead, Jeff | SP | Gwinnett Guinea Pigs | 23 | 01/16/2025 | Ft. Worth | USA | Right | Right | 6' 3" | 200 lbs | - |
