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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Machehin, Leonid | LF | Baltimore Bullets | 27 | 02/09/2019 | Salsk | RUS | Left | Left | 6' 1" | 200 lbs | $5,250,000 |
| MacKinder, Daniel | RF | Hollywood Shredders | 25 | 01/17/2021 | Warsop | ENG | Right | Right | 6' 2" | 200 lbs | $280,000 |
| MacMurchy, Archie | SP | Toledo Stingers | 23 | 06/20/2023 | Oregon | USA | Left | Left | 6' 6" | 210 lbs | $280,000 |
| Macías, António | 3B | Detroit Elite | 27 | 02/22/2019 | San Nicolas | CRC | Right | Right | 6' 1" | 200 lbs | $19,000,000 |
| Maes, Javier | RP | Vancouver Grey Wolves | 27 | 07/12/2019 | Ecatepec | MEX | Right | Right | 6' 0" | 200 lbs | $1,500,000 |
| Maes, Ánibal | SP | Ft. Worth Cattlemen | 18 | 11/30/2028 | Santo Domingo | DOM | Right | Right | 6' 1" | 180 lbs | - |
| Makaalohi, Hemolekekeakua | SP | Vancouver Grey Wolves | 17 | 03/12/2029 | Faleniu | ASA | Right | Right | 6' 3" | 180 lbs | - |
| Malone, Dudley | SP | Detroit Elite | 28 | 09/07/2018 | New York | USA | Right | Left | 5' 10" | 200 lbs | $280,000 |
| Manalo, Marvello | RP | D.C. Divided | 23 | 06/20/2023 | Anuling | PHI | Switch | Right | 5' 11" | 165 lbs | $280,000 |
| Mandala, Kieron | SS | Free Agent | 18 | 05/12/2028 | Durban | RSA | Right | Right | 6' 2" | 180 lbs | - |
| Mansilha, Marços | C | Detroit Elite | 25 | 09/06/2021 | Jequié | BRA | Switch | Right | 6' 3" | 205 lbs | $280,000 |
| Marchand, Paul | 3B | D.C. Divided | 26 | 11/09/2020 | Brampton | CAN | Right | Right | 6' 0" | 190 lbs | $280,000 |
| Marreno, José | CF | Baltimore Bullets | 17 | 12/23/2029 | Arequipa | PER | Right | Right | 6' 2" | 170 lbs | - |
| Marrero, Iván | CF | Colorado Billy Goats | 18 | 01/03/2028 | Pocrí | PAN | Left | Left | 6' 2" | 170 lbs | - |
| Martínez, Mario | SP | D.C. Divided | 18 | 09/10/2028 | Bajos de Haina | DOM | Right | Right | 5' 9" | 160 lbs | - |
| Martínez, Miguel Angel | SP | Charleston Battery | 36 | 07/17/2010 | Santo Domingo | DOM | Right | Right | 6' 2" | 200 lbs | $1,000,000 |
| Mason, Alan | RP | Mississippi Mockingbirds | 31 | 07/02/2015 | Wheeling | USA | Left | Right | 6' 3" | 230 lbs | $600,000 |
| Mason, Eric | RP | Hollywood Shredders | 28 | 12/14/2018 | Bakersfield | USA | Right | Right | 6' 3" | 200 lbs | $580,000 |
| Matsumoto, Tetsu | 1B | Hollywood Shredders | 30 | 11/04/2016 | Tokyo | JPN | Switch | Right | 6' 1" | 205 lbs | $17,000,000 |
| Mayo, Mathew | 1B | Colorado Billy Goats | 31 | 05/12/2015 | Fallon | USA | Right | Right | 6' 2" | 230 lbs | $2,000,000 |
| McCusker, Jack | CF | Detroit Elite | 27 | 03/03/2019 | Newark | USA | Left | Left | 6' 4" | 200 lbs | $4,200,000 |
| McNealy, Maverick | RP | Detroit Elite | 29 | 09/30/2017 | Hollis | USA | Right | Right | 6' 2" | 210 lbs | $475,000 |
| Mealha, Augusto | SP | D.C. Divided | 19 | 06/10/2027 | Jundiaí | BRA | Right | Left | 6' 4" | 185 lbs | - |
| Medina, Rafael | SP | Vancouver Grey Wolves | 17 | 12/17/2029 | Nuevo Sabana Yegua | DOM | Right | Right | 6' 2" | 180 lbs | - |
| Mellor, Ed | 1B | Colorado Billy Goats | 35 | 12/05/2011 | Temple City | USA | Left | Left | 6' 4" | 250 lbs | $4,000,000 |
| Melman, Mannus | SP | Colorado Billy Goats | 18 | 05/09/2028 | Oranjestad | ARU | Right | Right | 6' 2" | 170 lbs | - |
| Mena, Ismael | SP | Hollywood Shredders | 17 | 08/13/2029 | Iquique | CHI | Switch | Right | 6' 2" | 170 lbs | - |
| Mercado, Raúl | 3B | Free Agent | 17 | 10/12/2029 | Valencia | VEN | Switch | Right | 6' 3" | 195 lbs | - |
| Milano, Jesús | SP | Toledo Stingers | 18 | 02/23/2028 | Ciudad Guayana | VEN | Right | Right | 6' 3" | 190 lbs | - |
| Milatovic, Boris | SP | Mississippi Mockingbirds | 26 | 06/24/2020 | Asenovgrad | BUL | Right | Right | 5' 10" | 175 lbs | $500,000 |
| Miller, Bernard | SP | Mississippi Mockingbirds | 23 | 06/03/2023 | Washington | USA | Left | Left | 6' 1" | 175 lbs | $280,000 |
| Miniato, Costanzo | SP | Mississippi Mockingbirds | 25 | 08/05/2021 | Bellizzi | ITA | Right | Right | 6' 3" | 200 lbs | $280,000 |
| Mitchell, Hamish | SP | Baltimore Bullets | 17 | 09/21/2029 | Stirling | SCO | Right | Right | 6' 2" | 180 lbs | - |
| Miura, Tsugiharu | RP | Free Agent | 17 | 04/14/2029 | Tokyo | JPN | Right | Right | 6' 4" | 180 lbs | - |
| Montoya, Santiago | SS | Colorado Billy Goats | 19 | 02/25/2027 | Apodaca | MEX | Left | Right | 6' 3" | 175 lbs | - |
| Mooney, David | 2B | Charleston Battery | 27 | 10/13/2019 | Chicago | USA | Right | Right | 6' 4" | 200 lbs | $280,000 |
| Moore, David | SP | Vancouver Grey Wolves | 36 | 04/22/2010 | Irvine | USA | Switch | Right | 6' 4" | 210 lbs | $11,000,000 |
| Moore, Jeff | RP | Toledo Stingers | 29 | 05/14/2017 | Kahuku | USA | Right | Right | 6' 2" | 200 lbs | $280,000 |
| Mora, Fernando | RP | Colorado Billy Goats | 28 | 10/14/2018 | La Vega | DOM | Left | Left | 6' 1" | 200 lbs | $280,000 |
| Morales, Jesús | RF | Free Agent | 19 | 01/24/2027 | Higüey | DOM | Left | Left | 6' 1" | 185 lbs | - |
| Morales, Roberto | RP | Colorado Billy Goats | 26 | 07/21/2020 | San Felipe | CRC | Right | Right | 6' 8" | 225 lbs | $530,000 |
| Morrison, Scott | SP | D.C. Divided | 34 | 04/17/2012 | Lofthouse-Stanley | ENG | Left | Right | 6' 0" | 200 lbs | $650,000 |
| Morterero, Pablo | C | Mississippi Mockingbirds | 26 | 09/16/2020 | Caracas | VEN | Right | Right | 6' 4" | 220 lbs | $280,000 |
| Morán, Norberto | SP | Colorado Billy Goats | 19 | 01/31/2027 | Maracay | VEN | Right | Right | 6' 4" | 195 lbs | - |
| Munn, Jamie | SP | Toledo Stingers | 16 | 02/10/2030 | Mandeville | JAM | Left | Right | 6' 1" | 170 lbs | - |
| Muñóz, Mauro | CF | Charleston Battery | 18 | 07/31/2028 | Managua | NCA | Right | Right | 6' 0" | 170 lbs | - |
| Myslajek, Pielgrzym | SS | Ft. Worth Cattlemen | 23 | 06/22/2023 | Marijampole | LTU | Left | Right | 6' 0" | 180 lbs | $2,800,000 |
| Márquez, Manuel | 2B | Free Agent | 29 | 02/04/2017 | Havana | CUB | Right | Right | 6' 1" | 195 lbs | - |
| Méndez, Anastasio | SP | Ft. Worth Cattlemen | 17 | 10/15/2029 | Cotuí | DOM | Switch | Right | 6' 6" | 200 lbs | - |
| Méndez, Matt | CF | Colorado Billy Goats | 30 | 07/06/2016 | Oak Ridge | USA | Right | Right | 5' 9" | 190 lbs | $5,300,000 |
