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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Macazaga, Luis | CF | Bakersfield Nobles | 29 | 06/28/2023 | Higüey | DOM | Right | Right | 6' 4" | 200 lbs | - |
| MacGlasrich, Bill | CF | Sunset District Fog | 25 | 01/11/2027 | Garden City | USA | Left | Left | 6' 0" | 195 lbs | - |
| Maekawa, Yoichibei | RP | Syracuse Starks | 31 | 08/05/2021 | Kannami | JPN | Left | Left | 6' 0" | 200 lbs | - |
| Marino, Ramón | 3B | Monongahela Monsters | 28 | 02/28/2024 | Cardenas | CUB | Switch | Right | 6' 0" | 200 lbs | - |
| Marte, Ramón | SP | Baton Rouge Brass | 25 | 04/11/2027 | La Piedad | MEX | Right | Right | 6' 2" | 185 lbs | - |
| Martínez, Miguel | RP | Athletic Club KC Reserves | 23 | 04/17/2029 | Chillan | CHI | Left | Right | 6' 4" | 200 lbs | - |
| Mason, Eric | RP | Alaskan Humpbacks | 34 | 12/14/2018 | Bakersfield | USA | Right | Right | 6' 3" | 200 lbs | - |
| Matlah, Sanya | SP | Sunset District Fog | 23 | 11/11/2029 | Suvorov | RUS | Right | Right | 6' 2" | 190 lbs | $280,000 |
| Matsuura, Senzo | CF | Kansas Rainbeaus | 26 | 03/15/2026 | Kitakyushu | JPN | Right | Left | 6' 1" | 195 lbs | - |
| Matthews, Tom | RP | Athletic Club KC Reserves | 32 | 04/11/2020 | Santa Clara | USA | Left | Right | 6' 0" | 200 lbs | - |
| Maxwell, Woody | 3B | Hialeah Dodos | 33 | 10/08/2019 | Lodi | USA | Right | Right | 6' 4" | 205 lbs | - |
| McCall, Curt | 1B | Norfolk Pajaritos | 23 | 10/09/2029 | Cape Coral | USA | Left | Left | 6' 0" | 210 lbs | - |
| McDermott, Marvin | RP | Free Agent | 31 | 08/17/2021 | Fairfield | USA | Right | Right | 6' 3" | 200 lbs | - |
| Mcquade, Jayden | SP | Monongahela Monsters | 24 | 05/04/2028 | Scranton | USA | Left | Left | 6' 3" | 200 lbs | - |
| Mercado, José | CF | Monongahela Monsters | 22 | 07/24/2030 | Morelia | MEX | Switch | Right | 6' 5" | 185 lbs | - |
| Middleton, Walt | SP | Norfolk Pajaritos | 26 | 03/26/2026 | Tulsa | USA | Right | Left | 6' 2" | 200 lbs | - |
| Milatovic, Boris | SP | Free Agent | 32 | 06/24/2020 | Asenovgrad | BUL | Right | Right | 5' 10" | 180 lbs | - |
| Miller, Jamie | RP | Athletic Club KC Reserves | 29 | 06/28/2023 | Maple Shade Township | USA | Switch | Right | 6' 2" | 195 lbs | $280,000 |
| Miller, Jason | SP | Free Agent | 34 | 02/25/2018 | Lawton | USA | Switch | Right | 5' 9" | 195 lbs | - |
| Milliken, David | 2B | Bakersfield Nobles | 37 | 10/22/2015 | Cody | USA | Right | Right | 6' 2" | 215 lbs | $280,000 |
| Mireles, Javier | 3B | Norfolk Pajaritos | 26 | 10/11/2026 | Comitan | MEX | Right | Right | 6' 4" | 205 lbs | - |
| Mitchell, Jake | SP | Syracuse Starks | 34 | 05/11/2018 | Minot | USA | Right | Left | 5' 10" | 200 lbs | - |
| Mitra, Daulat | SS | Bakersfield Nobles | 27 | 11/11/2025 | Noida | IND | Switch | Right | 5' 11" | 175 lbs | - |
| Montés, Dave | SS | Monongahela Monsters | 30 | 11/15/2022 | South Hill | USA | Right | Right | 6' 2" | 200 lbs | - |
| Moore, Tommy | RP | Monongahela Monsters | 30 | 05/12/2022 | Kailua (Hawai'i County) | USA | Right | Right | 6' 4" | 200 lbs | - |
| Morales, Fernando | 1B | Sunset District Fog | 25 | 02/07/2027 | Santo Domingo | DOM | Left | Left | 6' 3" | 200 lbs | - |
| Morales, Jesús | RF | Athletic Club KC Reserves | 25 | 01/24/2027 | Higüey | DOM | Left | Left | 6' 1" | 195 lbs | $280,000 |
| Moreno, Armando | SP | Bakersfield Nobles | 27 | 10/03/2025 | San José | CRC | Right | Right | 6' 2" | 205 lbs | - |
| Muijen, Gerjan | SP | Kansas Rainbeaus | 26 | 02/26/2026 | Rincon | ANT | Switch | Right | 6' 2" | 200 lbs | - |
| Mun, Kyung-un | 2B | Sunset District Fog | 24 | 05/10/2028 | Seoul | KOR | Right | Right | 6' 3" | 195 lbs | - |
| Myrick, Calvin | SS | Free Agent | 30 | 07/05/2022 | New York | USA | Right | Right | 6' 2" | 200 lbs | - |
| Méndez, Ricardo | SP | Sunset District Fog | 26 | 01/29/2026 | Los Angeles | USA | Right | Right | 6' 2" | 200 lbs | - |
