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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Mae, Haechan | 2B | Minnesota Loons | 25 | 04/03/2019 | Sinpo | PRK | Right | Right | 6' 4" | 210 lbs | - |
| Mann, Vaughan | RP | Free Agent | 23 | 02/12/2021 | St. Simons | USA | Left | Left | 6' 5" | 215 lbs | - |
| Mareno, Pablo | RP | Billings Polar Bears | 24 | 12/04/2020 | Santiago | CHI | Left | Left | 6' 2" | 195 lbs | - |
| Marks, Richard | SP | Irving Blue Sox | 26 | 07/04/2018 | Oklahoma City | USA | Right | Right | 6' 1" | 210 lbs | - |
| Márquez, Rafael | RP | Casper Ghosts | 24 | 01/18/2020 | San Lorenzo | PUR | Switch | Right | 6' 2" | 220 lbs | - |
| Martínez, Javier | SP | Yakima Hops | 25 | 10/19/2019 | Ipís | CRC | Right | Right | 6' 4" | 195 lbs | - |
| Martínez, Rafael | RP | Lake Minnetonka Love Boats | 26 | 12/02/2018 | Santo Domingo | DOM | Right | Right | 6' 5" | 210 lbs | - |
| Mata, Armando | RP | Lancaster Farmers | 22 | 03/14/2022 | Antioquia | COL | Right | Left | 6' 2" | 200 lbs | - |
| McComb, Jimmy | 2B | Billings Polar Bears | 24 | 12/24/2020 | Philadelphia | USA | Left | Right | 6' 4" | 210 lbs | - |
| McGinnity, Darwin | SP | Toledo Saboteurs | 24 | 03/04/2020 | Winona | USA | Right | Right | 6' 3" | 195 lbs | - |
| McMahon, George | 1B | Asheville Highlanders | 24 | 06/14/2020 | Fern Creek | USA | Switch | Right | 6' 0" | 210 lbs | - |
| Medina, Alfonso | RP | Lake Minnetonka Love Boats | 23 | 05/12/2021 | San Antonio Ilotenango | GUA | Right | Right | 6' 0" | 185 lbs | - |
| Mercier, Jean | SP | Lake Minnetonka Love Boats | 24 | 10/03/2020 | Richmond Hill | CAN | Right | Right | 6' 4" | 210 lbs | - |
| Mitchell, Anthony | DH | Crescent City Krewe | 23 | 06/06/2021 | Spring Green | USA | Right | Right | 6' 0" | 200 lbs | - |
| Molina, Iván | RP | Billings Polar Bears | 22 | 08/01/2022 | Monterrey | MEX | Right | Right | 6' 2" | 200 lbs | - |
| Moore, Nelson | 3B | Richland Rails | 23 | 10/08/2021 | Cumberland | USA | Right | Right | 6' 2" | 190 lbs | - |
| Moore, Tony | 3B | Richland Rails | 24 | 05/21/2020 | Queens | USA | Right | Right | 6' 4" | 220 lbs | - |
| Moore, William | 1B | Billings Polar Bears | 23 | 03/08/2021 | Aspen Hill | USA | Switch | Right | 6' 1" | 200 lbs | - |
| Morales, Alfredo | RP | Minnesota Loons | 23 | 10/18/2021 | San Rafael Abajo | CRC | Left | Left | 6' 2" | 185 lbs | - |
| Morales, Juan | SS | Billings Polar Bears | 24 | 02/06/2020 | Weymouth | USA | Right | Right | 6' 5" | 215 lbs | - |
| Morán, León | SP | Billings Polar Bears | 22 | 05/14/2022 | Uruca | CRC | Left | Left | 6' 6" | 190 lbs | - |
| Morgan, Mac | 1B | Free Agent | 26 | 06/03/2018 | Sandy Springs | USA | Right | Right | 6' 2" | 245 lbs | - |
| Morita, Hirokazu | SP | Casper Ghosts | 25 | 12/01/2019 | Sapporo | JPN | Right | Right | 6' 1" | 195 lbs | - |
| Morris, Millard | 2B | Yakima Hops | 25 | 03/27/2019 | San Diego | USA | Right | Right | 6' 0" | 175 lbs | - |
| Mugglestone, Dylan | RP | Richland Rails | 25 | 09/28/2019 | London | ENG | Left | Left | 6' 1" | 195 lbs | - |
| Mullinger, Martin | CF | Minnesota Loons | 22 | 05/25/2022 | Heswall | ENG | Right | Right | 6' 2" | 180 lbs | - |
| Mullins, Shawn | CF | Barton Springs Blues | 28 | 05/29/2016 | Kissimmee | USA | Right | Right | 6' 0" | 200 lbs | - |
| Muñóz, Júlio | SS | Crescent City Krewe | 21 | 10/25/2023 | Los Teques | VEN | Right | Right | 6' 0" | 180 lbs | - |
| Murphy, Ted | C | Asheville Highlanders | 28 | 04/30/2016 | Tracy | USA | Right | Right | 5' 11" | 225 lbs | - |
