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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MacIvor, Kevin | RP | Columbia River Rats | 23 | 03/08/2015 | Brampton | CAN | Left | Left | 6' 2" | 200 lbs | - |
| Martin, Bobby | RP | Belleville Bulls | 22 | 01/12/2016 | Plymouth | USA | Right | Right | 6' 2" | 190 lbs | - |
| Martínez, Víctor | 1B | Cape Coral Reefers | 23 | 01/02/2015 | San Juan | PUR | Right | Right | 6' 2" | 230 lbs | - |
| Matsui, Hyosuke | RP | Columbia River Rats | 22 | 04/13/2016 | Nachikatsuura | JPN | Right | Right | 6' 3" | 195 lbs | - |
| Mayer, John | C | Columbia River Rats | 21 | 01/20/2017 | Edgefield | USA | Left | Right | 5' 11" | 175 lbs | - |
| McCain, Rod | 2B | Kennesaw Jets | 22 | 05/12/2016 | Granger | USA | Right | Right | 6' 1" | 195 lbs | - |
| McConnell, Sam | 3B | Grand Forks Caterpillars | 23 | 09/10/2015 | Washington | USA | Right | Right | 6' 3" | 205 lbs | - |
| McElroy, Thomas | C | Idaho Falls Chukars | 22 | 03/22/2016 | Boston | USA | Right | Right | 6' 0" | 200 lbs | - |
| McGee, Anthony | 3B | Kennesaw Jets | 20 | 04/29/2018 | Carson City | USA | Right | Right | 6' 5" | 210 lbs | - |
| McGrady, Bobby | LF | Idaho Falls Chukars | 23 | 04/29/2015 | Salisbury | USA | Left | Left | 6' 1" | 200 lbs | - |
| McKendrick, Ray | RP | Athletic Club KC U-24 | 22 | 11/12/2016 | Rutherford | USA | Left | Right | 6' 0" | 195 lbs | - |
| McMillan, Tony | RF | Belleville Bulls | 22 | 12/25/2016 | Yardley | USA | Left | Left | 6' 4" | 205 lbs | - |
| McNealy, Maverick | RP | Louisiana Dragoons | 21 | 09/30/2017 | Hollis | USA | Right | Right | 6' 2" | 195 lbs | - |
| Medrano, Felipe | RP | Columbia River Rats | 22 | 12/12/2016 | Santo Domingo | DOM | Left | Left | 6' 7" | 205 lbs | - |
| Méndez, Fernando | 2B | Free Agent | 20 | 11/08/2018 | Caracas | VEN | Switch | Right | 6' 0" | 180 lbs | - |
| Mercado, Cristo | CF | Grim Reapers | 24 | 10/18/2014 | San Cristóbal | DOM | Right | Right | 6' 3" | 200 lbs | - |
| Messer, Jacob | SP | Belleville Bulls | 22 | 06/08/2016 | Saratoga Springs | USA | Right | Right | 6' 8" | 220 lbs | - |
| Middleton, Joe | C | Idaho Falls Chukars | 22 | 02/06/2016 | Denver | USA | Switch | Right | 6' 1" | 215 lbs | - |
| Miranda, José | RP | Grand Forks Caterpillars | 22 | 09/15/2016 | Buenos Aires | ARG | Right | Right | 6' 2" | 190 lbs | - |
| Mitchell, Richard | CF | Put-In-Bay BC | 21 | 07/16/2017 | Hoyt Lakes | USA | Right | Right | 6' 0" | 170 lbs | - |
| Morales, António | RP | Columbia River Rats | 21 | 09/14/2017 | Santo Domingo | DOM | Right | Right | 6' 7" | 205 lbs | - |
| Morris, Frank | RF | Columbia River Rats | 23 | 01/11/2015 | Zephyrhills South | USA | Left | Left | 6' 5" | 215 lbs | - |
| Mugo, Kokaji | SS | Athletic Club KC U-24 | 21 | 09/05/2017 | Midrand | RSA | Right | Right | 6' 4" | 190 lbs | - |
| Mullen, Matt | C | Kennesaw Jets | 21 | 03/11/2017 | Mentor | USA | Left | Right | 6' 0" | 205 lbs | - |
| Mullins, Shawn | CF | Mt. Vernon Bulls | 22 | 05/29/2016 | Kissimmee | USA | Right | Right | 6' 0" | 185 lbs | - |
| Mun, Chi-eun | CF | Grim Reapers | 24 | 05/19/2014 | Yangju | KOR | Right | Right | 6' 4" | 220 lbs | - |
| Murphy, Ted | C | Idaho Falls Chukars | 22 | 04/30/2016 | Tracy | USA | Right | Right | 5' 11" | 205 lbs | - |
| Myoga, Masao | RP | Idaho Falls Chukars | 20 | 02/10/2018 | Tokyo | JPN | Right | Right | 6' 3" | 180 lbs | - |
