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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Macarandang, Nolan | SP | Grim Reapers | 24 | 11/09/2031 | Spring Valley | USA | Switch | Right | 6' 6" | 205 lbs | - |
| Mack, Mark | SP | Columbia River Rats | 24 | 04/07/2031 | Pembroke Pines | USA | Right | Left | 6' 4" | 210 lbs | - |
| MacNamara, Jesse | RP | Grim Reapers | 23 | 03/05/2032 | Friendswood | USA | Right | Left | 6' 0" | 190 lbs | - |
| Mangin, Chris | RP | Athletic Club KC U-24 | 23 | 11/30/2032 | Mount Royal | CAN | Left | Left | 6' 6" | 220 lbs | - |
| Mansvelt, Gareth | RP | Lake Erie Arryns | 24 | 09/08/2031 | Willemstad | CUR | Right | Right | 6' 6" | 200 lbs | - |
| Manumakalii, Apia | SP | Caldwell Chiefs | 24 | 06/04/2031 | Faleniu | ASA | Switch | Right | 6' 1" | 190 lbs | - |
| Martas, Arturo | CF | Columbia River Rats | 22 | 12/18/2033 | Chimbote | PER | Right | Right | 6' 1" | 165 lbs | - |
| Martínez, Joaquín | SP | Columbia River Rats | 23 | 11/18/2032 | West Haven-Sylvan | USA | Right | Right | 6' 2" | 200 lbs | - |
| Martínez, Manuel | RP | Free Agent | 23 | 03/20/2032 | Meridian | USA | Right | Right | 6' 4" | 200 lbs | - |
| Matsumoto, Kichibei | LF | Athletic Club KC U-24 | 22 | 05/01/2033 | Hachinohe | JPN | Left | Right | 6' 1" | 195 lbs | - |
| Maxwell, Bob | CF | Kennesaw Jets | 23 | 05/25/2032 | Quebec City | CAN | Right | Right | 6' 0" | 190 lbs | - |
| McCarthy, John | SP | Caldwell Chiefs | 22 | 06/09/2033 | Germantown | USA | Left | Left | 6' 6" | 205 lbs | - |
| McCoy, Jermaine | RF | Free Agent | 23 | 01/05/2032 | Covington | USA | Left | Left | 6' 6" | 220 lbs | - |
| McGee, Brad | 3B | Caldwell Chiefs | 24 | 09/08/2031 | Baton Rouge | USA | Right | Right | 6' 3" | 200 lbs | - |
| McGeraghty, Culley | SP | Walla Walla Walleye | 23 | 12/13/2032 | Colorado Springs | USA | Left | Right | 6' 0" | 190 lbs | - |
| McGinnis, Tim | C | Caldwell Chiefs | 22 | 04/25/2033 | Liberty | USA | Right | Right | 5' 10" | 180 lbs | - |
| McGuire, Gary | RF | Columbia River Rats | 21 | 04/08/2034 | Los Angeles | USA | Left | Left | 6' 1" | 190 lbs | - |
| McQueen, Joe | CF | Caldwell Chiefs | 20 | 03/21/2035 | Kingston | USA | Left | Left | 6' 0" | 180 lbs | - |
| Meeks, Bill | SS | South Beach Blaze | 21 | 10/23/2034 | Hebron | USA | Right | Right | 6' 1" | 175 lbs | - |
| Mendoza, David | C | Columbia River Rats | 23 | 08/26/2032 | Boone | USA | Right | Right | 5' 10" | 185 lbs | - |
| Merlet, Robin | SS | Walla Walla Walleye | 22 | 07/28/2033 | Givors | FRA | Right | Right | 6' 2" | 180 lbs | - |
| Meyer, Oscar | 3B | South Beach Blaze | 22 | 05/23/2033 | Chicago | USA | Right | Right | 6' 4" | 200 lbs | - |
| Mezzatesta, Fernando | 3B | Cut Off Crawdads | 22 | 06/02/2033 | Charallave | VEN | Right | Right | 6' 0" | 175 lbs | - |
| Mills, Geoffrey | RP | Cut Off Crawdads | 24 | 09/12/2031 | Oelwein | USA | Right | Right | 6' 4" | 205 lbs | - |
| Miura, Akihito | SP | Grim Reapers | 24 | 08/16/2031 | Hachioji | JPN | Right | Right | 6' 3" | 200 lbs | - |
| Molina, Rafael | CF | Walla Walla Walleye | 21 | 12/20/2034 | Guadalupe | CRC | Left | Left | 6' 2" | 180 lbs | - |
| Montalvo, Rubén | SP | Walla Walla Walleye | 23 | 10/01/2032 | Santo Domingo | DOM | Left | Left | 6' 0" | 175 lbs | - |
| Montoya, Andrés | 1B | Grand Forks Caterpillars | 22 | 01/21/2033 | Aguacaliente | CRC | Left | Right | 6' 2" | 205 lbs | - |
| Moore, Jim | RF | Cut Off Crawdads | 24 | 09/26/2031 | Murrieta | USA | Left | Left | 6' 2" | 200 lbs | - |
| Moore, Quinn | 2B | Walla Walla Walleye | 24 | 12/17/2031 | Grand Junction | USA | Left | Right | 6' 0" | 190 lbs | - |
| Morales, Juan | RF | Athletic Club KC U-24 | 23 | 06/16/2032 | Córdoba | ARG | Left | Right | 5' 9" | 160 lbs | - |
| Moran, Vince | SP | Columbia River Rats | 24 | 07/22/2031 | Upland | USA | Right | Right | 6' 0" | 200 lbs | - |
| Myers, Kelly | CF | Free Agent | 22 | 01/27/2033 | Detroit | USA | Right | Right | 6' 4" | 200 lbs | - |
