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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Machen, Michael | SP | San Mateo Dirty Reds | 32 | 03/19/2006 | Quincy | USA | Right | Right | 6' 0" | 220 lbs | $25,000,000 |
| Mai, Feng-xiang | RP | Cleveland Browns | 18 | 08/12/2020 | Taichung | TPE | Left | Left | 6' 3" | 185 lbs | - |
| Mancebo, Jesús | C | St. Louis Coeur | 19 | 06/09/2019 | Ocós | GUA | Right | Right | 5' 11" | 180 lbs | - |
| Manning, Ron | RP | Buffalo White Walkers | 31 | 01/22/2007 | College Station | USA | Left | Right | 5' 10" | 205 lbs | $6,530,000 |
| Mansilha, Marços | C | Mississippi Mockingbirds | 17 | 09/06/2021 | Jequié | BRA | Switch | Right | 6' 3" | 195 lbs | - |
| Marrero, Armando | RP | Free Agent | 33 | 04/15/2005 | Westfield | USA | Right | Right | 6' 0" | 205 lbs | - |
| Martarano, Joe | RP | Free Agent | 30 | 12/08/2008 | Mugnano di Napoli | ITA | Switch | Right | 6' 2" | 220 lbs | - |
| Martin, Kylian | SP | Chicago Silver Sox | 18 | 03/25/2020 | Lunel | FRA | Right | Right | 6' 7" | 195 lbs | - |
| Martínez, Javier | SP | Chicago Silver Sox | 19 | 10/19/2019 | Ipís | CRC | Right | Right | 6' 4" | 180 lbs | - |
| Mata, Armando | SP | D.C. Divided | 16 | 03/14/2022 | Antioquia | COL | Right | Left | 6' 2" | 180 lbs | - |
| Matena, Carsten | SP | Northern Virginia Rainbow Mermaids | 17 | 05/22/2021 | Paramaribo | SUR | Right | Right | 6' 3" | 185 lbs | - |
| Matsubara, Kagetoki | SP | Las Vegas Flamingos | 30 | 10/02/2008 | Kasuga | JPN | Switch | Right | 6' 3" | 205 lbs | $470,000 |
| Matsui, Junji | RF | Chicago Silver Sox | 18 | 01/12/2020 | Ebino | JPN | Left | Left | 6' 5" | 195 lbs | - |
| Mayfield, Baker | RP | D.C. Divided | 32 | 04/10/2006 | Warwick | USA | Right | Right | 6' 1" | 190 lbs | $6,000,000 |
| McCoy, Daniel | RF | San Mateo Dirty Reds | 29 | 07/25/2009 | Bloomington | USA | Right | Right | 6' 5" | 225 lbs | $18,350,000 |
| Memmi, David | SP | Las Vegas Flamingos | 17 | 09/13/2021 | Caracas | VEN | Left | Right | 6' 1" | 170 lbs | - |
| Men, Joy-shan | SP | Hollywood Shredders | 27 | 11/14/2011 | Shaoxing | CHN | Right | Right | 6' 2" | 210 lbs | $850,000 |
| Mence, Rio | SS | San Mateo Dirty Reds | 27 | 01/25/2011 | Belize | BLZ | Left | Right | 6' 1" | 195 lbs | $2,100,000 |
| Méndez, Juan | 2B | St. Louis Coeur | 17 | 06/27/2021 | San Joaquín | VEN | Right | Right | 6' 2" | 175 lbs | - |
| Mi, Yu-eh | RP | Free Agent | 30 | 12/12/2008 | Keelung | TPE | Left | Left | 6' 7" | 250 lbs | - |
| Michel, Erwan | SS | Mississippi Mockingbirds | 17 | 08/05/2021 | Saint-Just | FRA | Right | Right | 6' 3" | 185 lbs | - |
| Miller, Clarence | SP | D.C. Divided | 24 | 07/16/2014 | Texarkana | USA | Right | Right | 6' 0" | 200 lbs | $280,000 |
| Miniato, Costanzo | SP | Mississippi Mockingbirds | 17 | 08/05/2021 | Bellizzi | ITA | Right | Right | 6' 3" | 175 lbs | - |
| Montoya, Pedro | SS | Thunder Bay Northern Lions BC | 17 | 05/17/2021 | San José | CRC | Right | Right | 6' 0" | 165 lbs | - |
| Moore, David | SP | St. Louis Coeur | 28 | 04/22/2010 | Irvine | USA | Switch | Right | 6' 4" | 215 lbs | $3,800,000 |
| Mora, Rafael | RF | Northern Virginia Rainbow Mermaids | 19 | 08/29/2019 | San José | CRC | Left | Left | 6' 3" | 190 lbs | - |
| Morales, Bartolo | 3B | Las Vegas Flamingos | 35 | 04/04/2003 | La Vega | DOM | Right | Right | 6' 2" | 250 lbs | $280,000 |
| Moreno, Juan | SP | San Mateo Dirty Reds | 25 | 12/05/2013 | Bayamón | PUR | Right | Right | 5' 11" | 200 lbs | $280,000 |
| Morterero, Pablo | C | Mississippi Mockingbirds | 18 | 09/16/2020 | Caracas | VEN | Right | Right | 6' 4" | 200 lbs | - |
| Mueller, Joe | LF | St. Louis Coeur | 24 | 07/19/2014 | St. Joseph | USA | Right | Left | 6' 1" | 190 lbs | $280,000 |
| Mullaney, Chip | CF | D.C. Divided | 27 | 10/03/2011 | Indianapolis | USA | Right | Right | 6' 1" | 205 lbs | $470,000 |
| Mungus, Hugh | 3B | San Mateo Dirty Reds | 34 | 06/17/2004 | Camarillo | USA | Right | Right | 6' 4" | 245 lbs | $8,000,000 |
| Muñíz, Jesús | 3B | Cleveland Browns | 19 | 08/01/2019 | Mejicanos | SLV | Switch | Right | 6' 3" | 185 lbs | - |
| Muñóz, António | SP | Free Agent | 32 | 05/09/2006 | El Tocuyo | VEN | Left | Left | 6' 6" | 205 lbs | - |
| Murakami, Nobuhisa | 2B | St. Louis Coeur | 30 | 12/14/2008 | Okayama | JPN | Right | Right | 6' 0" | 190 lbs | $11,100,000 |
| Murphy, Abel | 3B | D.C. Divided | 26 | 04/12/2012 | Medford | USA | Right | Right | 6' 1" | 215 lbs | $280,000 |
| Mustard, Christian | RP | Las Vegas Flamingos | 33 | 02/03/2005 | West Covina | USA | Right | Right | 6' 0" | 180 lbs | $3,400,000 |
