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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Macías, Carlos | CF | Pontiac Godfathers | 20 | 06/24/2027 | Puente Alto | CHI | Left | Left | 5' 10" | 170 lbs | - |
| Mak, Qing-lai | CF | Laredo Hawks | 24 | 08/22/2023 | Taichung | TPE | Switch | Left | 6' 3" | 200 lbs | - |
| Marino, Carlos | RF | Smoky Mountain Hobeaus | 22 | 08/05/2025 | Tipitapa | NCA | Right | Right | 5' 10" | 175 lbs | - |
| Martinez, Bastien | CL | Laredo Hawks | 22 | 08/22/2025 | Port-au-Prince | HAI | Right | Right | 6' 4" | 200 lbs | - |
| Martínez, Julian | C | Put-In-Bay Commodores | 21 | 04/26/2026 | Belize | BLZ | Right | Right | 6' 0" | 185 lbs | - |
| Martínez, Manny | SP | Washington Generals | 24 | 06/15/2023 | Guatire | VEN | Right | Right | 6' 0" | 180 lbs | - |
| Marín, Cris | 3B | Washington Generals | 23 | 01/16/2024 | Delta del Tigre | CRC | Switch | Right | 6' 1" | 200 lbs | - |
| Matsuura, Senzo | CF | Smoky Mountain Hobeaus | 21 | 03/15/2026 | Kitakyushu | JPN | Right | Left | 6' 1" | 175 lbs | - |
| Mayes, George | C | Huntington Hermit Crabs | 24 | 10/20/2023 | Spokane | USA | Left | Right | 6' 4" | 215 lbs | - |
| McAfee, Richard | RP | Put-In-Bay Commodores | 23 | 06/23/2024 | Toronto | CAN | Left | Left | 6' 4" | 200 lbs | - |
| McBride, Bake | CF | Put-In-Bay Commodores | 22 | 08/30/2025 | Plant City | USA | Right | Right | 6' 0" | 175 lbs | - |
| McCord, Richard | RP | Monroeville Yinzers | 22 | 03/17/2025 | Newport News | USA | Switch | Left | 6' 8" | 210 lbs | - |
| McCoy, Bo | CF | Washington Generals | 21 | 03/03/2026 | Somerville | USA | Right | Right | 6' 2" | 190 lbs | - |
| McCreedy, Rob | RP | Free Agent | 24 | 02/23/2023 | Schererville | USA | Right | Right | 6' 1" | 205 lbs | - |
| McGill, Oscar | SS | Yucca Valley Yellows | 22 | 10/22/2025 | San Francisco | USA | Right | Right | 6' 1" | 190 lbs | - |
| McLaughlin, Donatas | CF | Laredo Hawks | 22 | 02/04/2025 | Valdosta | USA | Switch | Right | 6' 2" | 185 lbs | - |
| Medina, José | RP | Grand Forks Caterpillars | 22 | 05/06/2025 | Concepción | CHI | Switch | Right | 5' 11" | 165 lbs | - |
| Medina, Rafael | RP | Delmarva Gallos | 24 | 11/21/2023 | Lincolnia | USA | Left | Left | 6' 4" | 205 lbs | - |
| Melanson, Jon | SS | Laredo Hawks | 21 | 06/05/2026 | Toronto | CAN | Left | Right | 6' 5" | 200 lbs | - |
| Meza, Paco | SP | Washington Generals | 22 | 10/17/2025 | New York | USA | Right | Right | 6' 4" | 200 lbs | - |
| Middlemiss, Carl | RP | Free Agent | 22 | 01/14/2025 | Kingswood | ENG | Switch | Right | 5' 10" | 165 lbs | - |
| Middleton, Walt | SP | Delmarva Gallos | 21 | 03/26/2026 | Tulsa | USA | Right | Left | 6' 2" | 190 lbs | - |
| Miller, Fred | RP | Monroeville Yinzers | 22 | 06/07/2025 | Largo | USA | Right | Right | 6' 0" | 175 lbs | - |
| Millon, Marvello | 3B | Washington Generals | 20 | 08/02/2027 | Manila | PHI | Right | Right | 6' 4" | 200 lbs | - |
| Montáñez, Félix | SP | Put-In-Bay Commodores | 22 | 09/12/2025 | Bremerton | USA | Right | Right | 6' 4" | 200 lbs | - |
| Moore, Cal | 3B | Yucca Valley Yellows | 23 | 08/02/2024 | Woodmere | USA | Right | Right | 6' 3" | 205 lbs | - |
| Moorhouse, Ed | CF | Free Agent | 24 | 02/13/2023 | Los Angeles | USA | Right | Right | 6' 1" | 185 lbs | - |
| Morris, Joe | SP | Put-In-Bay Commodores | 24 | 09/04/2023 | Staten Island | USA | Switch | Right | 6' 6" | 225 lbs | - |
| Morris, Mike | SP | Pontiac Godfathers | 24 | 01/11/2023 | Suisun City | USA | Right | Right | 6' 0" | 190 lbs | - |
| Morrison, Garth | CF | Washington Generals | 23 | 09/04/2024 | Clarendon | USA | Right | Right | 5' 10" | 175 lbs | - |
| Morán, Mateo | C | Delmarva Gallos | 21 | 02/25/2026 | Pinar del Rio | CUB | Right | Right | 5' 10" | 170 lbs | - |
| Muijen, Gerjan | SP | Smoky Mountain Hobeaus | 21 | 02/26/2026 | Rincon | ANT | Switch | Right | 6' 2" | 195 lbs | - |
| Murphy, John | RP | Free Agent | 25 | 11/16/2022 | Indianapolis | USA | Switch | Right | 6' 0" | 200 lbs | - |
| Murphy, Matt | C | Free Agent | 24 | 07/11/2023 | West Springfield | USA | Right | Right | 6' 1" | 215 lbs | - |
| Murphy, William | CF | Monroeville Yinzers | 23 | 04/23/2024 | Madison | USA | Right | Right | 6' 4" | 205 lbs | - |
