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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Mabait, Richello | LF | Free Agent | 30 | 02/25/2012 | Marcelo | PHI | Left | Left | 6' 2" | 210 lbs | - |
| Maldonado, Rafael | 1B | Vancouver Grey Wolves | 31 | 04/01/2011 | Colón | CUB | Right | Right | 6' 5" | 250 lbs | $1,800,000 |
| Man, Sung-jae | RP | Oakland Oaks | 29 | 06/30/2013 | Siheung | KOR | Right | Right | 6' 2" | 225 lbs | $280,000 |
| Manning, Ron | RP | Toledo Stingers | 35 | 01/22/2007 | College Station | USA | Left | Right | 5' 10" | 210 lbs | $2,200,000 |
| Marín, Cris | 3B | D.C. Divided | 18 | 01/16/2024 | Delta del Tigre | CRC | Switch | Right | 6' 1" | 185 lbs | - |
| Marino, Ramón | 3B | Pittsburgh Kingfishers | 18 | 02/28/2024 | Cardenas | CUB | Switch | Right | 6' 0" | 180 lbs | - |
| Martínez, Carlos | SP | Seattle Rocketeers | 17 | 12/17/2025 | Santo Domingo | DOM | Right | Right | 6' 2" | 175 lbs | - |
| Martínez, Jorge | SS | Montana Pandas | 17 | 06/26/2025 | Ipís | CRC | Right | Right | 6' 2" | 165 lbs | - |
| Martínez, José | SP | Brooklyn Dodgers | 16 | 06/01/2026 | Pinar del Rio | CUB | Right | Right | 6' 8" | 205 lbs | - |
| Martínez, Julian | C | Toledo Stingers | 16 | 04/26/2026 | Belize | BLZ | Right | Right | 6' 0" | 180 lbs | - |
| Mast, John | 2B | Oakland Oaks | 26 | 01/07/2016 | Phenix City | USA | Right | Right | 6' 2" | 215 lbs | $280,000 |
| Masuda, Takejiro | RP | Las Vegas Flamingos | 24 | 05/20/2018 | Omagari | JPN | Left | Left | 5' 9" | 170 lbs | $280,000 |
| Mayo, Mathew | 1B | Seattle Rocketeers | 27 | 05/12/2015 | Fallon | USA | Right | Right | 6' 2" | 230 lbs | $420,000 |
| McCauley, Ricky | RP | Toledo Stingers | 31 | 04/23/2011 | Scottsdale | USA | Left | Left | 6' 4" | 215 lbs | $1,100,000 |
| McCroskey, Phil | LF | Brooklyn Dodgers | 31 | 01/23/2011 | White Plains | USA | Right | Right | 6' 2" | 195 lbs | $3,750,000 |
| McGirt, Willie | CF | Vancouver Grey Wolves | 34 | 08/01/2008 | Boiling Springs | USA | Switch | Right | 6' 3" | 235 lbs | $2,750,000 |
| McKendrick, Ray | RP | Athletic Club KC | 26 | 11/12/2016 | Rutherford | USA | Left | Right | 6' 0" | 200 lbs | $280,000 |
| Medina, Claudio | CF | Montana Pandas | 17 | 03/13/2025 | Valencia | VEN | Switch | Right | 6' 2" | 180 lbs | - |
| Melichar, Krystof | 2B | Pittsburgh Kingfishers | 29 | 07/18/2013 | Vsetín | CZE | Right | Right | 5' 10" | 190 lbs | $9,900,000 |
| Meyers, Jeffery | SP | Pittsburgh Kingfishers | 27 | 03/07/2015 | Manchester Center | USA | Left | Left | 6' 1" | 205 lbs | $2,000,000 |
| Minor, Ralph | SP | Nashville Outlaws | 26 | 07/24/2016 | Southlake | USA | Switch | Right | 6' 2" | 200 lbs | $280,000 |
| Miranda, Jorge | 2B | Free Agent | 17 | 08/06/2025 | Las Matas de Farfan | DOM | Switch | Right | 6' 2" | 185 lbs | - |
| Mireles, Giovanni | SP | Panama City Piranhas | 37 | 03/17/2005 | Naples | ITA | Switch | Right | 6' 0" | 215 lbs | $4,710,000 |
| Miura, Shimei | 3B | Nashville Outlaws | 35 | 08/02/2007 | Bisai | JPN | Right | Right | 6' 0" | 225 lbs | $4,340,000 |
| Molina, Alfredo | SP | Brooklyn Dodgers | 24 | 10/22/2018 | Bogota | COL | Right | Right | 6' 2" | 190 lbs | $280,000 |
| Montaño, Gabriel | CF | Panama City Piranhas | 17 | 05/07/2025 | Los Angeles | CHI | Right | Right | 6' 2" | 175 lbs | - |
| Montoya, Pepe | SP | Brooklyn Dodgers | 18 | 01/22/2024 | Desamparados | CRC | Right | Right | 6' 1" | 175 lbs | - |
| Morán, Jesús | LF | Free Agent | 27 | 02/28/2015 | El Rama | NCA | Right | Right | 6' 4" | 210 lbs | - |
| Morishita, Munoto | RP | Las Vegas Flamingos | 29 | 03/21/2013 | Sagamihara | JPN | Right | Right | 5' 11" | 195 lbs | $580,000 |
| Mouhon, Silverberry | RP | Echo Park Lakers | 32 | 08/27/2010 | Columbine | USA | Right | Right | 5' 10" | 210 lbs | $280,000 |
| Mueller, Joe | RF | Echo Park Lakers | 28 | 07/19/2014 | St. Joseph | USA | Right | Left | 6' 1" | 190 lbs | $2,360,000 |
| Muñóz, Carlos | 3B | Free Agent | 31 | 11/20/2011 | Santo Domingo | DOM | Right | Right | 6' 2" | 200 lbs | - |
| Myoga, Masao | SP | Brooklyn Dodgers | 24 | 02/10/2018 | Tokyo | JPN | Right | Right | 6' 3" | 190 lbs | $280,000 |
