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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Mae, Jin-oong | SP | Kingston Township Knights | 28 | 10/09/2015 | Gwangju | KOR | Right | Right | 6' 7" | 225 lbs | $5,472,000 |
| Mahé, Hugo | CF | Colorado Billy Goats | 18 | 12/01/2025 | Delmas | HAI | Right | Left | 6' 2" | 170 lbs | - |
| Mahir, Hudhayfah | SP | Pittsburgh Kingfishers | 16 | 04/17/2027 | Qiryat Gat | ISR | Right | Right | 6' 4" | 190 lbs | - |
| Mahl, Jeff | RP | Mississippi Mockingbirds | 34 | 07/26/2009 | Lower Burrell | USA | Right | Right | 6' 2" | 235 lbs | $8,260,000 |
| Maldonado, Júlio | CF | Las Vegas Flamingos | 18 | 04/29/2025 | Tijuana | MEX | Left | Left | 6' 0" | 170 lbs | - |
| Marquis, António | CF | St. Louis Coeur | 18 | 01/27/2025 | Coro | VEN | Switch | Right | 5' 10" | 155 lbs | - |
| Marquis, José | SP | Colorado Billy Goats | 18 | 12/27/2025 | Santiago | DOM | Right | Right | 6' 4" | 190 lbs | - |
| Martin, Marc | C | Kingston Township Knights | 17 | 12/29/2026 | Carrefour | HAI | Right | Right | 6' 1" | 195 lbs | - |
| Martin, Pascal | RP | Buckhead Bowties | 28 | 05/31/2015 | Tourcoing | FRA | Left | Right | 6' 8" | 220 lbs | $650,000 |
| Marzuq, Riyadh | SP | D.C. Divided | 17 | 12/21/2026 | Jerusalem | ISR | Left | Right | 6' 4" | 195 lbs | - |
| Mason, Alan | SP | Mississippi Mockingbirds | 28 | 07/02/2015 | Wheeling | USA | Left | Right | 6' 3" | 235 lbs | $420,000 |
| Matsuura, Senzo | CF | Mississippi Mockingbirds | 17 | 03/15/2026 | Kitakyushu | JPN | Right | Left | 6' 1" | 170 lbs | - |
| Maxwell, John | SS | Cleveland Browns | 17 | 11/14/2026 | Anna's Retreat | VIR | Right | Right | 6' 4" | 180 lbs | - |
| Mayo, Mathew | 1B | Seattle Rocketeers | 28 | 05/12/2015 | Fallon | USA | Right | Right | 6' 2" | 235 lbs | $3,250,000 |
| McAlear, Dave | SP | New Orleans Voodoo | 33 | 05/27/2010 | St. Albert | CAN | Left | Left | 6' 0" | 225 lbs | $280,000 |
| McCoy, Daniel | LF | Mississippi Mockingbirds | 34 | 07/25/2009 | Bloomington | USA | Right | Right | 6' 5" | 235 lbs | $21,750,000 |
| McMillan, Tony | RF | Kingston Township Knights | 27 | 12/25/2016 | Yardley | USA | Left | Left | 6' 4" | 215 lbs | $280,000 |
| Medina, José | SP | Buckhead Bowties | 18 | 05/06/2025 | Concepción | CHI | Switch | Right | 5' 11" | 160 lbs | - |
| Melichar, Krystof | 2B | Pittsburgh Kingfishers | 30 | 07/18/2013 | Vsetín | CZE | Right | Right | 5' 10" | 195 lbs | $9,900,000 |
| Mellor, Ed | 1B | Kingston Township Knights | 32 | 12/05/2011 | Temple City | USA | Left | Left | 6' 4" | 250 lbs | $14,000,000 |
| Méndez, Matt | CF | Colorado Billy Goats | 27 | 07/06/2016 | Oak Ridge | USA | Right | Right | 5' 9" | 190 lbs | $280,000 |
| Mendoza, Carlos | 3B | Pittsburgh Kingfishers | 31 | 06/29/2012 | Chichigalpa | NCA | Right | Right | 6' 5" | 225 lbs | $5,250,000 |
| Mendoza, Luis | SP | Free Agent | 17 | 10/25/2026 | Guatemala | GUA | Left | Left | 6' 9" | 210 lbs | - |
| Mendoza, Ramón | SP | D.C. Divided | 17 | 11/01/2026 | Dangriga | BLZ | Left | Right | 6' 4" | 185 lbs | - |
| Messer, Jacob | RP | Kingston Township Knights | 27 | 06/08/2016 | Saratoga Springs | USA | Right | Right | 6' 8" | 230 lbs | $420,000 |
| Meyers, Jeffery | SP | Pittsburgh Kingfishers | 28 | 03/07/2015 | Manchester Center | USA | Left | Left | 6' 1" | 205 lbs | $2,934,000 |
| Meza, Fernando | CF | San Mateo Dirty Reds | 16 | 01/16/2027 | Cúa | VEN | Left | Left | 6' 0" | 165 lbs | - |
| Milatovic, Boris | SP | Mississippi Mockingbirds | 23 | 06/24/2020 | Asenovgrad | BUL | Right | Right | 5' 10" | 170 lbs | $280,000 |
| Miller, Clarence | SP | Cleveland Browns | 29 | 07/16/2014 | Texarkana | USA | Right | Right | 6' 0" | 200 lbs | $1,300,000 |
| Miller, Roderick | RP | Buckhead Bowties | 28 | 01/13/2015 | Vernal | USA | Right | Right | 6' 6" | 235 lbs | $950,000 |
| Missing, Henry | SP | Long Island Lighthouse | 17 | 11/14/2026 | Grove Place | VIR | Right | Right | 6' 6" | 195 lbs | - |
| Mizuno, Kazunari | SS | Kingston Township Knights | 31 | 09/19/2012 | Yokohama | JPN | Right | Right | 5' 10" | 185 lbs | $420,000 |
| Mojica, Felipe | 3B | St. Louis Coeur | 18 | 07/08/2025 | Matamoros | MEX | Right | Right | 6' 4" | 195 lbs | - |
| Monterrey, Iván | C | Free Agent | 17 | 04/15/2026 | Matlapa | MEX | Right | Right | 6' 2" | 190 lbs | - |
| Montoya, Santiago | SS | Colorado Billy Goats | 16 | 02/25/2027 | Apodaca | MEX | Left | Right | 6' 2" | 175 lbs | - |
| Morales, Carlos | SP | Long Island Lighthouse | 19 | 12/29/2024 | Palma Soriano | CUB | Right | Right | 6' 3" | 190 lbs | - |
| Morales, Juan | SP | Long Island Lighthouse | 17 | 02/27/2026 | Tlalnepantla | MEX | Left | Left | 5' 9" | 150 lbs | - |
| Morales, Omar | RP | Buckhead Bowties | 29 | 02/26/2014 | Santiago | DOM | Right | Right | 6' 3" | 205 lbs | $644,000 |
| Morales, Roberto | RP | Colorado Billy Goats | 23 | 07/21/2020 | San Felipe | CRC | Right | Right | 6' 8" | 225 lbs | $280,000 |
| Morán, Norberto | SP | Colorado Billy Goats | 16 | 01/31/2027 | Maracay | VEN | Right | Right | 6' 4" | 190 lbs | - |
| Moreno, Juan | SP | San Mateo Dirty Reds | 30 | 12/05/2013 | Bayamón | PUR | Right | Right | 5' 11" | 200 lbs | $1,200,000 |
| Morgan, Travis | SP | San Mateo Dirty Reds | 29 | 11/12/2014 | Deltona | USA | Switch | Right | 6' 0" | 205 lbs | $6,500,000 |
| Morín, Miguel | C | Greenville 84s | 18 | 08/06/2025 | Santo Domingo | DOM | Left | Right | 6' 2" | 185 lbs | - |
| Moy, Jang-lu | RP | Pittsburgh Kingfishers | 26 | 07/07/2017 | Taipei | TPE | Left | Left | 6' 2" | 200 lbs | $280,000 |
| Muijen, Gerjan | SP | Mississippi Mockingbirds | 17 | 02/26/2026 | Rincon | ANT | Switch | Right | 6' 2" | 185 lbs | - |
| Mun, Chong-chin | SS | Colorado Billy Goats | 19 | 07/02/2024 | Daegu | KOR | Right | Right | 5' 9" | 165 lbs | - |
| Mungus, Hugh | 3B | Buckhead Bowties | 39 | 06/17/2004 | Camarillo | USA | Right | Right | 6' 4" | 245 lbs | $5,000,000 |
| Muñóz, Jorge | SS | Mississippi Mockingbirds | 25 | 11/11/2018 | Maracaibo | VEN | Right | Right | 6' 2" | 200 lbs | $280,000 |
| Mwaka, Kato | C | Free Agent | 20 | 11/17/2023 | Kampala | UGA | Right | Right | 6' 2" | 200 lbs | - |
| Mwanza, Hiba | C | Thunder Bay Northern Lions BC | 18 | 07/21/2025 | Buéa | CMR | Right | Right | 5' 11" | 185 lbs | - |
