| 12/31/2018 | ||||||
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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| Machuka, Xamida | RF | Savannah Hogs | 22 | 03/01/1996 | Richards Bay | RSA | Left | Left | 5' 10" | 175 lbs | - |
| MacIntosh, Brian | RF | Myrtle Beach Waves | 19 | 01/02/1999 | Mission Bend | USA | Left | Left | 6' 0" | 190 lbs | - |
| MacIntosh, Scot | CL | Nantucket Orcas | 20 | 09/19/1998 | Queens | USA | Right | Right | 6' 2" | 190 lbs | - |
| Malamapono, Hauoli | MR | Free Agent | 24 | 02/15/1994 | Safotu | SAM | Left | Right | 5' 11" | 203 lbs | - |
| Maldonado, Pablo | RF | State College Spikes | 21 | 12/12/1997 | Adjuntas | PUR | Right | Right | 6' 0" | 175 lbs | - |
| Martin, Alex | RF | Dunedin Blue Jays | 27 | 03/15/1991 | Hawthorne | USA | Left | Left | 5' 8" | 200 lbs | - |
| Martin, Mike | SS | Tolland Singrays | 21 | 07/02/1997 | Wadsworth | USA | Left | Right | 6' 2" | 205 lbs | - |
| Martínez, Jesús | 2B | Tolland Singrays | 24 | 10/11/1994 | Maracaibo | VEN | Right | Right | 5' 11" | 210 lbs | - |
| Martínez, Jorge | CF | State College Spikes | 24 | 10/12/1994 | Tapachula | MEX | Switch | Right | 6' 1" | 175 lbs | - |
| Martínez, José | LF | Free Agent | 24 | 01/16/1994 | Villa Altagracia | DOM | Right | Right | 6' 3" | 210 lbs | - |
| Martínez, José | 3B | Free Agent | 24 | 03/26/1994 | Mexicali | MEX | Right | Right | 6' 0" | 195 lbs | - |
| Martínez, Luis | SS | State College Spikes | 20 | 03/26/1998 | Bayamo | CUB | Right | Right | 6' 2" | 215 lbs | - |
| Martínez, Orlando | RF | Nantucket Orcas | 24 | 03/21/1994 | Rome | USA | Left | Left | 5' 11" | 215 lbs | - |
| Mathis, Michael | SP | Nashua Redlegs | 24 | 12/18/1994 | Bourne | USA | Right | Right | 6' 3" | 265 lbs | - |
| May, Jeremy | 1B | Dunedin Blue Jays | 28 | 06/10/1990 | Peoria | USA | Switch | Right | 6' 5" | 151 lbs | - |
| McClure, Jim | MR | Nantucket Orcas | 24 | 10/26/1994 | New York | USA | Right | Right | 6' 0" | 220 lbs | - |
| McFarland, Tim | SP | Tolland Singrays | 22 | 04/03/1996 | Hinesville | USA | Switch | Right | 6' 2" | 225 lbs | - |
| McKinney, Jeff | RF | Louisville Rockets | 19 | 04/11/1999 | Indianapolis | USA | Left | Left | 6' 1" | 190 lbs | - |
| McLean, Ken | 2B | Free Agent | 31 | 12/08/1987 | Mineral Wells | USA | Left | Right | 6' 1" | 198 lbs | - |
| McMillan, Willie | CL | Nashua Redlegs | 24 | 07/14/1994 | Oakland | USA | Right | Right | 6' 2" | 200 lbs | - |
| Medine, Alberto | C | Nantucket Orcas | 23 | 02/26/1995 | Zacapechpan | MEX | Left | Right | 6' 3" | 210 lbs | - |
| Mejía, Julián | C | Louisville Rockets | 24 | 05/24/1994 | David | PAN | Right | Right | 6' 3" | 200 lbs | - |
| Méndez, Manny | CF | Savannah Hogs | 23 | 05/22/1995 | Los Angeles | USA | Right | Right | 5' 11" | 185 lbs | - |
| Menéndez, César | CL | Savannah Hogs | 20 | 08/02/1998 | Cabudare | VEN | Right | Right | 5' 10" | 225 lbs | - |
| Mercado, Iván | RF | Free Agent | 26 | 07/13/1992 | East Grand Forks | USA | Right | Right | 6' 3" | 186 lbs | - |
| Meyer, Tom | 2B | Nashua Redlegs | 22 | 06/04/1996 | Lincolnwood | USA | Right | Right | 6' 0" | 185 lbs | - |
| Miller, Alex | MR | Free Agent | 30 | 12/29/1988 | Nashville | USA | Right | Right | 6' 6" | 209 lbs | - |
| Miller, Guy | C | State College Spikes | 29 | 10/03/1989 | Westford | USA | Right | Right | 6' 2" | 203 lbs | - |
| Miller, Paul | SP | Pensacola Pilots | 19 | 03/10/1999 | Phoenix | USA | Right | Right | 6' 0" | 170 lbs | - |
| Mitchell, Larry | 1B | Myrtle Beach Waves | 22 | 04/08/1996 | Marseilles | USA | Right | Right | 6' 2" | 190 lbs | - |
| Mitchell, Paul | MR | Free Agent | 24 | 03/23/1994 | North Creek | USA | Right | Right | 5' 9" | 200 lbs | - |
| Mizuno, Manabu | SP | Louisville Rockets | 24 | 07/03/1994 | Miyazaki | JPN | Right | Right | 5' 8" | 235 lbs | - |
| Mobley, Paul | 2B | Dunedin Blue Jays | 25 | 02/27/1993 | Philadelphia | USA | Switch | Right | 6' 4" | 220 lbs | - |
| Molleson, Max | SP | Dunedin Blue Jays | 20 | 02/06/1998 | Queens | USA | Switch | Right | 6' 1" | 230 lbs | - |
| Montalvo, Armando | MR | Athens Assassins | 33 | 09/20/1985 | Brooklyn | USA | Left | Right | 6' 0" | 195 lbs | - |
| Monteagudo, Miguel | 2B | Savannah Hogs | 21 | 12/19/1997 | Maracaibo | VEN | Right | Right | 5' 8" | 185 lbs | - |
| Montoya, Juan | MR | Free Agent | 24 | 09/15/1994 | Santo Domingo | DOM | Right | Right | 6' 2" | 195 lbs | - |
| Moore, George | MR | Dunedin Blue Jays | 33 | 08/11/1985 | Albuquerque | USA | Left | Left | 6' 5" | 217 lbs | - |
| Moore, Vic | SP | Savannah Hogs | 25 | 08/24/1993 | San Diego | USA | Right | Right | 6' 2" | 225 lbs | - |
| Morán, Jorge | SP | Savannah Hogs | 23 | 07/04/1995 | San Pedro de Macorís | DOM | Left | Left | 6' 1" | 250 lbs | - |
| Moreno, Miguel | MR | Free Agent | 29 | 10/22/1989 | Teyahualco | MEX | Switch | Right | 6' 0" | 189 lbs | - |
| Morín, César | MR | Myrtle Beach Waves | 23 | 12/16/1995 | Holualoa | USA | Right | Right | 6' 0" | 230 lbs | - |
| Morse, Mike | MR | Free Agent | 24 | 04/30/1994 | Mabton | USA | Right | Right | 6' 1" | 210 lbs | - |
| Muńíz, José | SP | Savannah Hogs | 24 | 05/04/1994 | Long Beach | USA | Left | Left | 6' 3" | 220 lbs | - |
| Murray, David | RF | Dunedin Blue Jays | 23 | 01/29/1995 | South Daytona | USA | Right | Left | 5' 8" | 158 lbs | - |
