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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MacDougal, Steve | SP | Hamilton Thunderbirds | 32 | 06/25/2022 | Millington | USA | Right | Right | 6' 0" | 185 lbs | - |
| MacKinder, Daniel | CF | Hialeah Dodos | 33 | 01/17/2021 | Warsop | ENG | Right | Right | 6' 2" | 200 lbs | $1,700,000 |
| MacKissock, Tom | SP | Free Agent | 31 | 02/21/2023 | Rexburg | USA | Left | Left | 6' 1" | 190 lbs | - |
| Maejima, Koryusai | 1B | Hartford Pride | 33 | 04/29/2021 | Fujisawa | JPN | Right | Right | 6' 0" | 200 lbs | - |
| Manning, Rex | SP | Pennsauken Flyers | 23 | 04/05/2031 | Neenah | USA | Right | Right | 6' 1" | 200 lbs | - |
| Martin, Doug | RP | Plymouth Rocks | 28 | 02/20/2026 | East Rutherford | USA | Right | Right | 6' 2" | 205 lbs | $280,000 |
| Martin, Rob | 2B | Hialeah Dodos | 23 | 08/04/2031 | Clearfield | USA | Left | Right | 6' 0" | 195 lbs | - |
| Martínez, Juan | 3B | Pennsauken Flyers | 24 | 11/19/2030 | Tocumen | PAN | Right | Right | 6' 2" | 195 lbs | - |
| Martínez, Raúl | RP | Hamilton Thunderbirds | 32 | 05/02/2022 | Freeport | USA | Right | Right | 5' 10" | 200 lbs | $280,000 |
| Martínez, Ricardo | LF | Pennsauken Flyers | 24 | 02/21/2030 | Suamico | USA | Right | Left | 6' 3" | 200 lbs | - |
| Maruyama, Iemitsu | LF | Sacramento Redlegs | 27 | 11/23/2027 | Tokyo | JPN | Switch | Right | 6' 2" | 215 lbs | - |
| Maxwell, Woody | 3B | Hialeah Dodos | 35 | 10/08/2019 | Lodi | USA | Right | Right | 6' 4" | 200 lbs | - |
| McBride, Bake | CF | Ellenburg Fighting Dachshunds | 29 | 08/30/2025 | Plant City | USA | Right | Right | 6' 0" | 200 lbs | - |
| McCaffery, Andrew | RF | Free Agent | 27 | 08/15/2027 | Cleburne | USA | Right | Right | 6' 4" | 200 lbs | - |
| McCall, Marvin | SP | Plymouth Rocks | 28 | 01/14/2026 | Opelousas | USA | Switch | Right | 6' 4" | 200 lbs | - |
| McCarthy, Gil | SP | Hartford Pride | 30 | 07/18/2024 | Los Angeles | USA | Switch | Right | 6' 1" | 200 lbs | - |
| McClure, Ambrose | RP | Ellenburg Fighting Dachshunds | 32 | 09/26/2022 | San Antonio | USA | Right | Right | 6' 1" | 200 lbs | - |
| McElroy, Fred | SS | Pennsauken Flyers | 26 | 07/24/2028 | Riverside | USA | Left | Right | 6' 0" | 195 lbs | - |
| McKee, Dusty | SP | Hartford Pride | 29 | 03/03/2025 | Long View | USA | Left | Left | 6' 4" | 200 lbs | - |
| McMahon, Cate | SS | Plymouth Rocks | 25 | 01/24/2029 | Queens | USA | Right | Right | 6' 2" | 205 lbs | - |
| Middleton, Walt | SP | Norfolk Pajaritos | 28 | 03/26/2026 | Tulsa | USA | Right | Left | 6' 2" | 200 lbs | - |
| Miller, Bill | SP | Free Agent | 32 | 09/11/2022 | Portsmouth | USA | Right | Right | 5' 10" | 195 lbs | - |
| Miller, Ed | C | Hialeah Dodos | 27 | 05/20/2027 | Allendale | USA | Right | Right | 6' 6" | 205 lbs | - |
| Miller, John | 2B | Pennsauken Flyers | 25 | 01/01/2029 | Reno | USA | Switch | Right | 6' 0" | 195 lbs | - |
| Monteblanco, Luis Miguel | RF | Plymouth Rocks | 33 | 06/02/2021 | Havana | CUB | Right | Right | 6' 0" | 200 lbs | $280,000 |
| Montáñez, Félix | SP | Free Agent | 29 | 09/12/2025 | Bremerton | USA | Right | Right | 6' 4" | 195 lbs | - |
| Moore, William | 2B | Ellenburg Fighting Dachshunds | 32 | 12/07/2022 | Omaha | USA | Right | Right | 5' 10" | 200 lbs | - |
| Morales, Juan | RP | Hartford Pride | 28 | 02/27/2026 | Tlalnepantla | MEX | Left | Left | 5' 9" | 170 lbs | - |
| Moreno, Júlio | CF | Kansas Rainbeaus | 27 | 11/21/2027 | Belize | BLZ | Left | Right | 6' 0" | 195 lbs | - |
| Morris, Joe | RP | Ellenburg Fighting Dachshunds | 31 | 09/04/2023 | Staten Island | USA | Switch | Right | 6' 6" | 215 lbs | - |
| Morse, Ethan | RP | Hamilton Thunderbirds | 29 | 04/03/2025 | Somerset | USA | Right | Right | 6' 2" | 200 lbs | $280,000 |
| Moya, James | 1B | Kansas Rainbeaus | 31 | 08/02/2023 | Houston | USA | Left | Right | 6' 1" | 210 lbs | - |
| Muijen, Gerjan | SP | Kansas Rainbeaus | 28 | 02/26/2026 | Rincon | ANT | Switch | Right | 6' 2" | 200 lbs | - |
| Mun, Kyung-un | 2B | Sunset District Fog | 26 | 05/10/2028 | Seoul | KOR | Right | Right | 6' 3" | 200 lbs | - |
| Murphy, Eugene | LF | Free Agent | 23 | 03/09/2031 | Merced | USA | Right | Right | 6' 7" | 205 lbs | - |
| Murphy, Phil | RP | Sunset District Fog | 24 | 01/26/2030 | Alamo | USA | Right | Right | 6' 2" | 200 lbs | - |
| Méndez, Ricardo | SP | Sunset District Fog | 28 | 01/29/2026 | Los Angeles | USA | Right | Right | 6' 2" | 195 lbs | - |
