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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Macíel, Juan | RF | Free Agent | 28 | 02/27/2008 | Detroit | USA | Left | Left | 6' 0" | 190 lbs | - |
| Madore, Henry | 3B | Cleveland Browns | 27 | 08/12/2009 | Saint-Jean-sur-Richelieu | CAN | Left | Right | 6' 1" | 220 lbs | $280,000 |
| Mae, Haechan | CF | Charleston Battery | 17 | 04/03/2019 | Sinpo | PRK | Right | Right | 6' 4" | 190 lbs | - |
| Mahl, Jeff | SP | Oakland Oaks | 27 | 07/26/2009 | Lower Burrell | USA | Right | Right | 6' 2" | 215 lbs | $280,000 |
| Makepeace, Zak | 3B | Nashville Outlaws | 19 | 11/10/2017 | Kingston | JAM | Left | Right | 6' 1" | 185 lbs | - |
| Mancebo, Jesús | C | St. Louis Coeur | 17 | 06/09/2019 | Ocós | GUA | Right | Right | 5' 11" | 180 lbs | - |
| Marrero, Armando | SP | Thunder Bay Northern Lions BC | 31 | 04/15/2005 | Westfield | USA | Right | Right | 6' 0" | 205 lbs | $588,000 |
| Martin, Kylian | SP | Chicago Silver Sox | 16 | 03/25/2020 | Lunel | FRA | Right | Right | 6' 7" | 195 lbs | - |
| Martínez, Alfredo | RF | Toledo Stingers | 32 | 12/14/2004 | El Tigre | VEN | Right | Right | 6' 3" | 215 lbs | $13,200,000 |
| Martínez, David | C | Houston 1837 BBC | 27 | 07/01/2009 | Cardenas | CUB | Right | Right | 6' 2" | 200 lbs | $280,000 |
| Martínez, Javier | SP | Chicago Silver Sox | 17 | 10/19/2019 | Ipís | CRC | Right | Right | 6' 4" | 180 lbs | - |
| Martínez, Jesús | C | Houston 1837 BBC | 18 | 10/29/2018 | Havana | CUB | Right | Right | 6' 2" | 195 lbs | - |
| Maskell, Rhys | SP | Chicago Silver Sox | 24 | 01/18/2012 | Anna's Retreat | VIR | Right | Right | 6' 2" | 200 lbs | $280,000 |
| Mason, Gary | SP | Free Agent | 28 | 12/03/2008 | Westchase | USA | Left | Right | 6' 1" | 200 lbs | - |
| Mateu, Jorge | 2B | Nashville Outlaws | 19 | 05/25/2017 | Santa Barbara | GUA | Left | Right | 6' 3" | 185 lbs | - |
| Matsui, Junji | RF | Chicago Silver Sox | 16 | 01/12/2020 | Ebino | JPN | Left | Left | 6' 5" | 185 lbs | - |
| McCain, Stanford | SP | Chicago Silver Sox | 32 | 12/09/2004 | San Antonio | USA | Switch | Left | 6' 1" | 225 lbs | $14,000,000 |
| McCoy, Daniel | RF | Northern Virginia Rainbow Mermaids | 27 | 07/25/2009 | Bloomington | USA | Right | Right | 6' 5" | 225 lbs | $8,000,000 |
| Melichar, Krystof | SS | Houston 1837 BBC | 23 | 07/18/2013 | Vsetín | CZE | Right | Right | 5' 10" | 170 lbs | $280,000 |
| Men, Joy-shan | SP | Chicago Silver Sox | 25 | 11/14/2011 | Shaoxing | CHN | Right | Right | 6' 2" | 205 lbs | $280,000 |
| Mence, Rio | SS | Northern Virginia Rainbow Mermaids | 25 | 01/25/2011 | Belize | BLZ | Left | Right | 6' 1" | 195 lbs | $280,000 |
| Mendoza, Pancho | SP | Northern Virginia Rainbow Mermaids | 17 | 09/24/2019 | Santiago de Cuba | CUB | Left | Left | 6' 8" | 205 lbs | - |
| Merle, Joseph | RP | Free Agent | 28 | 05/29/2008 | Nomexy | FRA | Right | Right | 6' 5" | 225 lbs | - |
| Mi, Yu-eh | CL | Nashville Outlaws | 28 | 12/12/2008 | Keelung | TPE | Left | Left | 6' 7" | 245 lbs | $10,970,000 |
| Miao, Yu | CF | Greenville 84s | 22 | 04/07/2014 | Xiaolan | CHN | Left | Right | 6' 3" | 195 lbs | $280,000 |
| Middendorf, Vito | 2B | Greenville 84s | 30 | 01/24/2006 | Zuidhorn | NED | Right | Right | 5' 11" | 185 lbs | $1,100,000 |
| Milatovic, Boris | SP | Mississippi Mockingbirds | 16 | 06/24/2020 | Asenovgrad | BUL | Right | Right | 5' 9" | 155 lbs | - |
| Milic, Milos | 1B | Athletic Club KC | 18 | 08/08/2018 | Sivacevo | BUL | Right | Right | 6' 1" | 195 lbs | - |
| Miranda, Raúl | CF | Thunder Bay Northern Lions BC | 17 | 12/14/2019 | Caracas | VEN | Switch | Right | 6' 3" | 185 lbs | - |
| Miyake, Jiro | C | Thunder Bay Northern Lions BC | 17 | 10/02/2019 | Higashikurume | JPN | Left | Right | 6' 0" | 185 lbs | - |
| Mobley, Elton | RP | Free Agent | 32 | 02/11/2004 | San Antonio | USA | Switch | Right | 6' 1" | 205 lbs | - |
| Molendijk, Jaap | SP | Chicago Silver Sox | 18 | 02/11/2018 | Princess Quarter | SIM | Right | Left | 6' 4" | 185 lbs | - |
| Montana, Panda | SP | Oakland Oaks | 31 | 10/05/2005 | Burlington | USA | Right | Right | 6' 3" | 210 lbs | $3,350,000 |
| Moonglampers, Dino | RP | Houston 1837 BBC | 30 | 04/08/2006 | El Paso | USA | Right | Right | 6' 4" | 205 lbs | $500,000 |
| Mora, Rafael | RF | Northern Virginia Rainbow Mermaids | 17 | 08/29/2019 | San José | CRC | Left | Left | 6' 3" | 185 lbs | - |
| Morel, Franck | 1B | Houston 1837 BBC | 17 | 10/28/2019 | Guérande | FRA | Right | Right | 6' 2" | 205 lbs | - |
| Morgan, Craig | 2B | Greenville 84s | 29 | 03/26/2007 | College Station | USA | Left | Right | 6' 4" | 215 lbs | $4,890,000 |
| Muñíz, Jesús | 3B | Cleveland Browns | 17 | 08/01/2019 | Mejicanos | SLV | Switch | Right | 6' 3" | 185 lbs | - |
| Muñóz, António | SP | Nashville Outlaws | 30 | 05/09/2006 | El Tocuyo | VEN | Left | Left | 6' 6" | 210 lbs | $2,400,000 |
| Muñóz, Jorge | SS | Mississippi Mockingbirds | 18 | 11/11/2018 | Maracaibo | VEN | Right | Right | 6' 2" | 180 lbs | - |
| Mutahi, Yakobo | SP | Nashville Outlaws | 19 | 05/25/2017 | Elliot | RSA | Left | Left | 6' 8" | 210 lbs | - |
| Mwamba, Mamoun | C | Toledo Stingers | 18 | 08/07/2018 | Ft. Beaufort | RSA | Right | Right | 6' 2" | 205 lbs | - |
