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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Machado, Estiven | 3B | Orem Owlz | 21 | 10/04/2002 | San Mateo | VEN | Switch | Right | 5' 10" | 175 lbs | - |
| Madden, Billy | C | Grand Junction Rockies | 21 | 03/04/2002 | Clovis | USA | Right | Right | 6' 0" | 215 lbs | - |
| Mahaney, Braeden | SP | Ogden Raptors | 18 | 02/28/2005 | Lafayette | USA | Right | Right | 6' 2" | 180 lbs | - |
| Mako, Chance | RP | Great Falls Voyagers | 19 | 07/31/2004 | Salisbury | USA | Right | Right | 6' 4" | 180 lbs | - |
| Malloy, Justyn-Henry | 3B | Orem Owlz | 23 | 02/19/2000 | Bergenfield | USA | Right | Right | 6' 2" | 205 lbs | - |
| Marsee, Jakob | LF | Great Falls Voyagers | 22 | 06/28/2001 | Allen Park | USA | Left | Left | 6' 0" | 180 lbs | - |
| Martorella, Nathan | 1B | Ogden Raptors | 22 | 02/18/2001 | Monterey | USA | Left | Left | 6' 1" | 215 lbs | - |
| Martínez, Jesús | RP | Missoula Osprey | 19 | 12/20/2003 | Santo Domingo | DOM | Left | Left | 6' 4" | 190 lbs | - |
| Martínez, Mario | RF | Free Agent | 21 | 02/15/2002 | Vicente Noble | DOM | Right | Right | 6' 5" | 200 lbs | - |
| Martínez, Rubén | SP | Rocky Mountain Vibes | 20 | 04/14/2003 | Caracas | VEN | Left | Left | 6' 0" | 170 lbs | - |
| Matvick, Cade | 2B | Grand Junction Rockies | 19 | 09/22/2004 | Minneapolis | USA | Right | Right | 5' 11" | 175 lbs | - |
| McDonough, Shane | SP | Grand Junction Rockies | 22 | 06/13/2001 | Boston | USA | Right | Right | 5' 11" | 190 lbs | - |
| McDougal, Tanner | SP | Orem Owlz | 20 | 04/08/2003 | Henderson | USA | Right | Right | 6' 6" | 205 lbs | - |
| McGee, Heath | RP | Grand Junction Rockies | 19 | 06/27/2004 | Laguna Niguel | USA | Right | Left | 6' 6" | 200 lbs | - |
| McGuire, Shane | C | Great Falls Voyagers | 24 | 04/12/1999 | Kent | USA | Left | Right | 6' 1" | 200 lbs | - |
| McKenzie, Jared | CF | Orem Owlz | 22 | 05/16/2001 | Round Rock | USA | Left | Right | 6' 0" | 175 lbs | - |
| McLain, Sean | 2B | Great Falls Voyagers | 22 | 03/22/2001 | Tustin | USA | Right | Right | 6' 2" | 175 lbs | - |
| McNealy, Ryan | SP | Grand Junction Rockies | 19 | 09/14/2004 | Carmel-by-the-Sea | USA | Right | Right | 6' 0" | 190 lbs | - |
| Mejía, Juan | 2B | Billings Mustangs | 19 | 03/01/2004 | Monción | DOM | Right | Right | 6' 2" | 180 lbs | - |
| Mendes, Wes | SP | Great Falls Voyagers | 19 | 10/04/2004 | Tampa | USA | Right | Left | 6' 1" | 180 lbs | - |
| Milbrandt, Karson | RP | Great Falls Voyagers | 19 | 04/21/2004 | Liberty | USA | Right | Right | 6' 1" | 180 lbs | - |
| Mills, Jake | SP | Orem Owlz | 21 | 05/26/2002 | Miami Lakes | USA | Left | Left | 6' 4" | 200 lbs | - |
| Miltenberger, Danny | CL | Great Falls Voyagers | 21 | 01/13/2002 | Coram | USA | Left | Left | 5' 11" | 185 lbs | - |
| Mitchell, Blake | C | Ogden Raptors | 19 | 08/03/2004 | Sinton | USA | Left | Right | 6' 0" | 180 lbs | - |
| Mokaio-Atimalala, Mason | 2B | Missoula Osprey | 21 | 06/17/2002 | Waipahu | USA | Right | Right | 6' 1" | 170 lbs | - |
| Morales, Félix | RP | Free Agent | 25 | 07/19/1998 | Matagalpa | NCA | Right | Right | 6' 4" | 205 lbs | - |
| Morales, Félix | C | Missoula Osprey | 20 | 02/04/2003 | Santo Domingo | DOM | Right | Right | 6' 0" | 195 lbs | - |
| Morales, Pedro | 3B | Missoula Osprey | 19 | 01/12/2004 | Barahona | DOM | Right | Right | 5' 10" | 150 lbs | - |
| Moss, Jack | 1B | Ogden Raptors | 22 | 10/30/2001 | Englewood | USA | Left | Right | 6' 5" | 205 lbs | - |
| Muller, Mark | SP | Missoula Osprey | 19 | 12/13/2003 | Spring Valley | USA | Left | Right | 6' 4" | 205 lbs | - |
| Murillo, Enzo | SP | Billings Mustangs | 20 | 06/03/2003 | Bonao | DOM | Right | Right | 6' 4" | 195 lbs | - |
| Méndez, Gerardo | SP | Ogden Raptors | 20 | 02/28/2003 | La Romana | DOM | Right | Right | 5' 10" | 165 lbs | - |
