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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MacDonald, Roy | CF | Sacramento Redlegs | 27 | 11/19/2022 | West Dennis | USA | Right | Right | 5' 11" | 180 lbs | $280,000 |
| Mae, Haechan | 2B | Calgary Lynx | 30 | 04/03/2019 | Sinpo | PRK | Right | Right | 6' 4" | 200 lbs | $280,000 |
| Maekawa, Yoichibei | RP | Syracuse Starks | 28 | 08/05/2021 | Kannami | JPN | Left | Left | 6' 0" | 200 lbs | - |
| Mamchenko, Sasha | RF | Hialeah Dodos | 21 | 05/01/2028 | Baranchinskiy | RUS | Left | Left | 6' 3" | 185 lbs | - |
| Manohoran, Senthamilselvi | C | Free Agent | 30 | 05/23/2019 | Ft. Worth | USA | Switch | Right | 6' 2" | 200 lbs | - |
| Manzanedo, Ignacio | RP | Alaskan Humpbacks | 31 | 12/17/2018 | Santa Cruz | ARG | Right | Right | 6' 1" | 190 lbs | $1,300,000 |
| Marshall, Richard | 3B | Sacramento Redlegs | 25 | 09/23/2024 | Edinburg | USA | Right | Right | 6' 0" | 200 lbs | - |
| Martínez, Juan | CF | Salt Lake City Buzz | 24 | 08/19/2025 | San German | PUR | Left | Left | 6' 0" | 185 lbs | - |
| Martínez, Juan | RF | Kansas Rainbeaus | 27 | 05/13/2022 | Carol City | USA | Left | Left | 6' 2" | 200 lbs | - |
| Matthews, Tom | SP | Athletic Club KC Reserves | 29 | 04/11/2020 | Santa Clara | USA | Left | Right | 6' 0" | 195 lbs | - |
| Maxwell, Woody | 3B | Hialeah Dodos | 30 | 10/08/2019 | Lodi | USA | Right | Right | 6' 4" | 215 lbs | - |
| McNealy, Maverick | RP | Free Agent | 32 | 09/30/2017 | Hollis | USA | Right | Right | 6' 2" | 200 lbs | - |
| McSweeny, Lee | CF | Free Agent | 28 | 04/09/2021 | Albertville | USA | Right | Right | 6' 0" | 190 lbs | - |
| Medina, Vicente | SP | Free Agent | 27 | 01/07/2022 | Norfolk | USA | Left | Right | 6' 5" | 210 lbs | - |
| Melanson, Jon | SS | Hialeah Dodos | 23 | 06/05/2026 | Toronto | CAN | Left | Right | 6' 5" | 200 lbs | - |
| Mendoza, Tony | LF | Sacramento Redlegs | 26 | 02/17/2023 | Miami Lakes | USA | Right | Right | 6' 3" | 200 lbs | - |
| Mendoza, Vicente | C | Salt Lake City Buzz | 26 | 11/04/2023 | Tegucigalpa | HON | Right | Right | 6' 4" | 200 lbs | - |
| Miller, Jamie | SP | Athletic Club KC Reserves | 26 | 06/28/2023 | Maple Shade Township | USA | Switch | Right | 6' 2" | 200 lbs | - |
| Mireles, Javier | 3B | Norfolk Pajaritos | 23 | 10/11/2026 | Comitan | MEX | Right | Right | 6' 4" | 200 lbs | - |
| Mitchell, Bill | RP | Jersey City Tritons | 24 | 11/14/2025 | Eau Claire | USA | Left | Right | 6' 0" | 190 lbs | $280,000 |
| Mitchell, Jake | SP | Syracuse Starks | 31 | 05/11/2018 | Minot | USA | Right | Left | 5' 10" | 195 lbs | - |
| Mizuno, Tokaji | LF | Free Agent | 27 | 08/27/2022 | Inazawa | JPN | Left | Left | 6' 1" | 195 lbs | - |
| Montgomery, Robert | 3B | Jersey City Tritons | 25 | 10/08/2024 | Richardson | USA | Left | Right | 6' 1" | 200 lbs | - |
| Montés, Javier | SP | Free Agent | 31 | 12/10/2018 | Somoto | NCA | Right | Right | 6' 6" | 220 lbs | - |
| Moore, Tony | 3B | Free Agent | 29 | 05/21/2020 | Queens | USA | Right | Right | 6' 4" | 220 lbs | - |
| Morales, Alfredo | RP | Calgary Lynx | 28 | 10/18/2021 | San Rafael Abajo | CRC | Left | Left | 6' 2" | 200 lbs | - |
| Morterero, Pablo | C | Kansas Rainbeaus | 29 | 09/16/2020 | Caracas | VEN | Right | Right | 6' 4" | 220 lbs | $280,000 |
| Morín, Miguel | C | Alaskan Humpbacks | 24 | 08/06/2025 | Santo Domingo | DOM | Left | Right | 6' 2" | 200 lbs | $280,000 |
| Mullinger, Martin | CF | Calgary Lynx | 27 | 05/25/2022 | Heswall | ENG | Right | Right | 6' 2" | 200 lbs | - |
| Murdoch, Jordan | RP | Jersey City Tritons | 28 | 05/30/2021 | Spanaway | USA | Right | Right | 6' 2" | 200 lbs | $280,000 |
| Murphy, Sean | SP | Jersey City Tritons | 29 | 02/27/2020 | Tempe | USA | Right | Right | 6' 6" | 205 lbs | $280,000 |
| Méndez, Juan | 2B | Kansas Rainbeaus | 28 | 06/27/2021 | San Joaquín | VEN | Right | Right | 6' 3" | 200 lbs | - |
