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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MacFadden, Chris | 3B | Philadelphia Quakers | 28 | 08/21/2006 | Orlando | USA | Right | Right | 6' 2" | 220 lbs | $730,000 |
| Mackenzie, Jim | RP | Houston Bayou Rats | 27 | 10/03/2007 | Toronto | CAN | Right | Right | 6' 4" | 225 lbs | $1,200,000 |
| MacMenzies, Tom | 3B | Hollywood Stars | 26 | 12/22/2008 | Honolulu | USA | Right | Right | 5' 10" | 175 lbs | $11,900,000 |
| Maddaford, Geoffrey | SS | Houston Bayou Rats | 31 | 02/07/2003 | Montpelier | USA | Right | Right | 6' 0" | 210 lbs | $13,520,000 |
| Maeda, Shirai | RP | Seattle Pilots | 27 | 02/25/2007 | Fuji | JPN | Left | Left | 6' 3" | 220 lbs | $300,000 |
| Maez, Miguel | SP | Oakland Oaks | 17 | 11/21/2017 | Havana | CUB | Left | Left | 6' 5" | 200 lbs | - |
| Mahoney, Arthur | 2B | Brooklyn Superbas | 31 | 11/19/2003 | Newark | USA | Switch | Right | 6' 3" | 210 lbs | - |
| Marés, Jorge | SS | Boston Beaneaters | 24 | 02/22/2010 | Cardenas | MEX | Right | Right | 5' 11" | 190 lbs | $300,000 |
| Márquez, Luis | CF | Oakland Oaks | 16 | 05/29/2018 | Moa | CUB | Right | Right | 6' 1" | 165 lbs | - |
| Márquez, Marcos | RP | Hollywood Stars | 25 | 02/07/2009 | Acatlan | MEX | Switch | Right | 6' 5" | 225 lbs | $300,000 |
| Marrero, Maurício | SP | Oakland Oaks | 18 | 01/21/2016 | Ponce | PUR | Right | Right | 6' 5" | 195 lbs | - |
| Marsh, Ray | SS | Boston Beaneaters | 35 | 10/20/1999 | Riverside | USA | Left | Right | 6' 3" | 235 lbs | $10,500,000 |
| Martínez, Jorge | SP | St. Louis Perfectos | 16 | 03/05/2018 | San Jorge | NCA | Right | Right | 6' 1" | 170 lbs | - |
| Martínez, José | SP | Oakland Oaks | 18 | 12/27/2016 | La Concepción | PAN | Right | Right | 6' 3" | 190 lbs | - |
| Martínez, Juan | SS | Chicago Whales | 32 | 03/09/2002 | Scranton | USA | Switch | Right | 6' 1" | 225 lbs | $11,700,000 |
| Martínez, Mario | SP | Chicago Whales | 19 | 01/15/2016 | Puerto Plata | DOM | Left | Left | 6' 3" | 180 lbs | - |
| Martínez, Paco | RP | St. Louis Perfectos | 26 | 09/10/2008 | Puerto Padre | CUB | Switch | Left | 6' 2" | 195 lbs | $550,000 |
| Martínez, Ricardo | LF | Miami X Giants | 24 | 01/27/2010 | Acuña | MEX | Right | Right | 6' 1" | 195 lbs | $300,000 |
| Martínez, Roberto | RP | Philadelphia Quakers | 27 | 08/29/2007 | Unknown | USA | Left | Right | 6' 0" | 190 lbs | $300,000 |
| Martínez, Roberto | C | Seattle Pilots | 37 | 05/04/1997 | Putnam | USA | Left | Right | 6' 3" | 210 lbs | - |
| Martínez, Rubén | RP | Free Agent | 35 | 12/25/1999 | Penbrook | USA | Right | Right | 6' 0" | 200 lbs | - |
| Mathis, Eric | CL | Chicago Whales | 25 | 04/01/2009 | New York | USA | Right | Right | 6' 5" | 230 lbs | $300,000 |
| McBride, Albert | RP | Houston Bayou Rats | 31 | 08/25/2003 | Weirton | USA | Right | Right | 6' 0" | 195 lbs | $9,000,000 |
| McDaniel, Shane | 1B | Seattle Pilots | 35 | 02/15/1999 | Killeen | USA | Right | Right | 5' 11" | 205 lbs | $7,300,000 |
| McGruder, Ronald | SP | Free Agent | 31 | 03/21/2003 | Somerville | USA | Right | Right | 6' 0" | 230 lbs | - |
| McKinney, Arlen | RP | Brooklyn Superbas | 27 | 08/28/2007 | West Seneca | USA | Right | Right | 6' 4" | 210 lbs | $550,000 |
| Medina, Carlos | C | Philadelphia Quakers | 17 | 08/31/2017 | Havana | CUB | Right | Right | 6' 0" | 190 lbs | - |
| Medina, José | RP | Seattle Pilots | 26 | 11/05/2008 | San Juan | PUR | Right | Right | 5' 10" | 180 lbs | $600,000 |
| Medina, Júlio | SP | Oakland Oaks | 17 | 11/05/2017 | Monte Plata | DOM | Switch | Right | 6' 0" | 175 lbs | - |
| Medine, José | SP | Philadelphia Quakers | 19 | 03/15/2015 | Santo Domingo | DOM | Left | Left | 6' 5" | 195 lbs | - |
| Meehan, Tim | RF | Rochester Redbirds | 37 | 12/19/1997 | Central Okanagan | CAN | Left | Left | 6' 3" | 185 lbs | $3,360,000 |
| Meier, Derek | C | Hollywood Stars | 17 | 08/12/2017 | Schifflange | LUX | Right | Right | 6' 2" | 200 lbs | - |
| Mejía, José | SP | Boston Beaneaters | 16 | 03/24/2018 | Colombia | CUB | Right | Right | 6' 4" | 185 lbs | - |
| Mena, Ricardo | RP | Hollywood Stars | 29 | 01/12/2006 | Unknown | MEX | Right | Right | 6' 0" | 220 lbs | $720,000 |
| Méndez, Jorge | 2B | Philadelphia Quakers | 25 | 07/26/2009 | New Hope | USA | Right | Right | 6' 2" | 200 lbs | $300,000 |
| Merrit, Mark | 1B | Boston Beaneaters | 29 | 09/01/2005 | Unknown | CAN | Right | Right | 6' 0" | 205 lbs | $660,000 |
| Mizutani, Norishige | C | Cleveland Spiders | 27 | 07/22/2007 | Chigasaki | JPN | Switch | Right | 5' 10" | 210 lbs | $10,687,500 |
| Mojica, António | SP | Boston Beaneaters | 17 | 08/22/2017 | Palmira | CUB | Right | Right | 6' 4" | 190 lbs | - |
| Mok, Qian | SP | Seattle Pilots | 19 | 08/26/2015 | Suzhou | CHN | Right | Right | 6' 6" | 210 lbs | - |
| Montaño, Ramón | SP | Hollywood Stars | 17 | 06/28/2017 | San Juan | PUR | Right | Right | 6' 1" | 175 lbs | - |
| Montgomery, Barrett | 1B | Houston Bayou Rats | 26 | 03/05/2008 | Worcester | USA | Right | Right | 6' 2" | 200 lbs | $300,000 |
| Montoya, Augusto | SS | Oakland Oaks | 26 | 03/07/2008 | Unknown | USA | Right | Right | 5' 11" | 185 lbs | $2,560,000 |
| Montoya, José | SP | Cleveland Spiders | 26 | 11/25/2008 | Unknown | MEX | Right | Right | 6' 2" | 210 lbs | $300,000 |
| Montoya, Roberto | CF | Chicago Whales | 34 | 07/06/2000 | Vega Baja | PUR | Right | Right | 5' 10" | 230 lbs | - |
| Morales, Andrés | RP | Rochester Redbirds | 23 | 08/14/2011 | Maplewood | USA | Switch | Right | 6' 5" | 220 lbs | $300,000 |
| Morales, Júlio | 2B | Seattle Pilots | 25 | 02/09/2009 | Fountain Valley | USA | Right | Right | 5' 11" | 205 lbs | $300,000 |
| Moreno, Edgar | C | Miami X Giants | 24 | 06/27/2010 | Cruces | CUB | Right | Right | 6' 0" | 200 lbs | $300,000 |
| Moreno, Ramón | RP | Brooklyn Superbas | 29 | 08/11/2005 | Unknown | MEX | Right | Right | 5' 11" | 190 lbs | $590,000 |
| Moreno, Tony | RP | Boston Beaneaters | 26 | 06/22/2008 | Guaynabo | PUR | Left | Left | 6' 4" | 230 lbs | $300,000 |
| Morgan, Danny | SS | Miami X Giants | 28 | 11/29/2006 | San Francisco | USA | Right | Right | 6' 0" | 205 lbs | $780,000 |
| Mosley, Claude | SP | Cleveland Spiders | 30 | 02/11/2004 | Sebastian | USA | Right | Right | 5' 9" | 240 lbs | $12,500,000 |
| Mota, Víctor | C | Brooklyn Superbas | 26 | 12/01/2008 | Aguas Buenas | PUR | Right | Right | 6' 4" | 220 lbs | $300,000 |
| Moy, Wu-ti | SP | Oakland Oaks | 19 | 06/07/2015 | Hsinchuang | TPE | Left | Left | 6' 5" | 200 lbs | - |
| Mukai, Kazuhiko | 3B | Boston Beaneaters | 18 | 01/24/2016 | Kasakake | JPN | Right | Right | 6' 0" | 175 lbs | - |
| Mullett, Dwayne | CF | Chicago Whales | 27 | 02/03/2007 | Courtenay | CAN | Switch | Right | 5' 11" | 195 lbs | $300,000 |
| Muñóz, José | SP | Cleveland Spiders | 18 | 02/25/2016 | Arecibo | PUR | Right | Right | 5' 11" | 165 lbs | - |
| Murillo, Jorge | CF | Cleveland Spiders | 17 | 03/14/2017 | Santo Domingo | DOM | Left | Left | 6' 1" | 175 lbs | - |
| Murphy, Tim | C | Philadelphia Quakers | 32 | 06/22/2002 | Amory | USA | Right | Right | 6' 2" | 235 lbs | $700,000 |
| Murray, Lou | SP | St. Louis Perfectos | 28 | 01/28/2006 | North Atlanta | USA | Left | Left | 6' 2" | 205 lbs | $12,000,000 |
| Myers, Richard | RF | Free Agent | 32 | 07/02/2002 | New York | USA | Right | Right | 5' 8" | 210 lbs | - |
