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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MacKinney, Millard | CF | Philadelphia Liberty Academy | 27 | 07/03/2035 | Atwater | USA | Switch | Right | 6' 2" | 205 lbs | - |
| Maldonado, José | SS | Free Agent | 29 | 01/14/2034 | El Alto | BOL | Right | Right | 6' 2" | 200 lbs | - |
| Maldonado, Pancho | RP | St. Petersburg Thunder | 25 | 12/05/2037 | Nueva San Salvador | SLV | Left | Left | 6' 1" | 190 lbs | - |
| Manchego, Diego | RP | Squirrel Hill Pierogis | 22 | 04/24/2040 | Villa Bisonó | DOM | Switch | Right | 6' 2" | 195 lbs | - |
| Marquis, Iván | RP | Squirrel Hill Pierogis | 29 | 01/13/2034 | Penn Hills | USA | Right | Right | 6' 0" | 200 lbs | - |
| Martin, Robert | SP | Squirrel Hill Pierogis | 21 | 06/02/2041 | Brooklyn | USA | Right | Right | 6' 2" | 185 lbs | - |
| May, Chad | SP | Philadelphia Liberty Academy | 24 | 01/04/2039 | Petaluma | USA | Switch | Right | 6' 2" | 185 lbs | - |
| McAllister, Kendrick | RP | Providence Pilgrims | 23 | 05/13/2039 | Spring Valley | USA | Left | Right | 6' 1" | 190 lbs | - |
| McCabe, Wilbert | RP | Minnesota Loons | 23 | 04/06/2039 | Dublin | USA | Left | Right | 6' 1" | 200 lbs | - |
| McLean, Monty | SP | Philadelphia Liberty Academy | 27 | 11/28/2035 | Guilford | USA | Right | Right | 6' 4" | 205 lbs | - |
| Medina, José | LF | St. Petersburg Thunder | 23 | 12/25/2039 | Mungía | ESP | Left | Left | 6' 1" | 190 lbs | - |
| Medley, Dean | SP | Free Agent | 24 | 06/20/2038 | London | ENG | Right | Right | 6' 3" | 200 lbs | - |
| Merced, Michael | 3B | Chesapeake Cangrejos Fantasmas | 25 | 08/01/2037 | Cleveland | USA | Switch | Right | 6' 2" | 195 lbs | - |
| Metcalf, Neil | 2B | Arizona Javelina | 27 | 05/26/2035 | New York | USA | Right | Right | 6' 0" | 195 lbs | - |
| Meza, Raúl | RP | Providence Pilgrims | 25 | 12/23/2037 | Oceanside | USA | Left | Left | 6' 2" | 195 lbs | - |
| Miller, Jesse | RF | Philadelphia Liberty Academy | 22 | 06/03/2040 | Cheektowaga | USA | Right | Right | 6' 4" | 200 lbs | - |
| Miller, Lou | 2B | Arizona Javelina | 27 | 09/10/2035 | Meridian | USA | Left | Right | 6' 2" | 195 lbs | - |
| Miller, Mark | C | Minnesota Loons | 22 | 03/14/2040 | Newport News | USA | Right | Right | 6' 0" | 200 lbs | - |
| Miller, Roger | CF | Squirrel Hill Pierogis | 29 | 11/08/2033 | Nixa | USA | Left | Left | 6' 1" | 200 lbs | - |
| Mitchell, Mark | RP | Free Agent | 25 | 07/12/2037 | Glassboro | USA | Right | Right | 6' 0" | 185 lbs | - |
| Moore, Leo | CF | Minnesota Loons | 27 | 06/21/2035 | Orange | USA | Left | Left | 6' 1" | 190 lbs | - |
| Moore, Marshall | C | Providence Pilgrims | 23 | 11/16/2039 | Chandler | USA | Right | Right | 6' 0" | 200 lbs | - |
| Morand, Jean-Luc | RP | Providence Pilgrims | 26 | 11/12/2036 | Chilly-Mazarin | FRA | Left | Left | 6' 4" | 200 lbs | - |
| Morgan, Pat | 3B | Minnesota Loons | 23 | 03/12/2039 | East Los Angeles | USA | Right | Right | 6' 3" | 210 lbs | - |
| Moss, Michael | 2B | Arizona Javelina | 27 | 11/13/2035 | Winter Springs | USA | Right | Right | 6' 0" | 200 lbs | - |
| Murayama, Tanzan | 2B | Lake Murray MotorBoaters | 22 | 03/24/2040 | Fukuoka | JPN | Right | Right | 6' 1" | 195 lbs | - |
| Muñóz, Luis | RP | Providence Pilgrims | 22 | 03/08/2040 | Santo Domingo | DOM | Right | Right | 5' 11" | 180 lbs | - |
| Muñóz, Manuel | RP | Arizona Javelina | 26 | 05/12/2036 | San Pedro de la Paz | CHI | Right | Right | 6' 5" | 200 lbs | - |
