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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MacBrayne, Daniel | LF | Yakima Hops | 23 | 09/07/2020 | San Diego | USA | Left | Left | 6' 5" | 220 lbs | - |
| Mack, Michael | C | Billings Polar Bears | 25 | 06/17/2018 | Medford | USA | Right | Right | 5' 9" | 180 lbs | - |
| MacKey, Coy | 1B | Toledo Saboteurs | 26 | 10/26/2017 | Missoula | USA | Right | Right | 6' 2" | 245 lbs | - |
| Mae, Haechan | 2B | Minnesota Loons | 24 | 04/03/2019 | Sinpo | PRK | Right | Right | 6' 4" | 210 lbs | - |
| Marks, Richard | RP | Irving Blue Sox | 25 | 07/04/2018 | Oklahoma City | USA | Right | Right | 6' 1" | 210 lbs | - |
| Martin, Joe | RP | Lake Minnetonka Love Boats | 27 | 08/15/2016 | Sunrise Manor | USA | Right | Right | 6' 4" | 220 lbs | - |
| Martínez, Javier | SP | Yakima Hops | 24 | 10/19/2019 | Ipís | CRC | Right | Right | 6' 4" | 195 lbs | - |
| Martínez, Rafael | RP | Lake Minnetonka Love Boats | 25 | 12/02/2018 | Santo Domingo | DOM | Right | Right | 6' 5" | 205 lbs | - |
| Matos, Juan Luis | SP | Yakima Hops | 21 | 12/26/2022 | San Andrés | GUA | Switch | Right | 6' 2" | 190 lbs | - |
| Matthews, Denny | RP | Barton Springs Blues | 26 | 06/23/2017 | New York | USA | Left | Right | 6' 5" | 220 lbs | - |
| Maynard, Roy | RF | Billings Polar Bears | 25 | 01/21/2018 | Tempe | USA | Switch | Left | 6' 6" | 230 lbs | - |
| McCoy, Foster | RP | Yakima Hops | 24 | 11/27/2019 | Carrollton | USA | Left | Right | 6' 0" | 205 lbs | - |
| McGinnity, Darwin | SP | Toledo Saboteurs | 23 | 03/04/2020 | Winona | USA | Right | Right | 6' 3" | 195 lbs | - |
| Mercier, Jean | SP | Lake Minnetonka Love Boats | 23 | 10/03/2020 | Richmond Hill | CAN | Right | Right | 6' 4" | 210 lbs | - |
| Miralles, Jorge | C | Lake Minnetonka Love Boats | 24 | 04/23/2019 | Valencia | VEN | Right | Right | 6' 4" | 225 lbs | - |
| Molina, Vicente | SP | Asheville Highlanders | 24 | 07/17/2019 | Brooklyn | USA | Right | Right | 6' 1" | 190 lbs | - |
| Montgomery, Alvin | LF | Billings Polar Bears | 25 | 04/16/2018 | Mesa | USA | Left | Left | 6' 4" | 205 lbs | - |
| Moore, Jeff | CL | Marquette Miners | 26 | 05/14/2017 | Kahuku | USA | Right | Right | 6' 2" | 200 lbs | - |
| Moore, Nelson | 3B | Richland Rails | 22 | 10/08/2021 | Cumberland | USA | Right | Right | 6' 2" | 190 lbs | - |
| Moore, Tony | 3B | Richland Rails | 23 | 05/21/2020 | Queens | USA | Right | Right | 6' 4" | 220 lbs | - |
| Morales, Alfredo | RP | Minnesota Loons | 22 | 10/18/2021 | San Rafael Abajo | CRC | Left | Left | 6' 2" | 185 lbs | - |
| Morgan, John | SP | Athletic Club KC Academy | 24 | 10/12/2019 | Richardson | USA | Right | Right | 5' 10" | 180 lbs | - |
| Morgan, Mac | 1B | Lancaster Farmers | 25 | 06/03/2018 | Sandy Springs | USA | Right | Right | 6' 2" | 245 lbs | - |
| Morris, Frank | RF | Asheville Highlanders | 28 | 01/11/2015 | Zephyrhills South | USA | Left | Left | 6' 5" | 230 lbs | - |
| Morris, Millard | 2B | Yakima Hops | 24 | 03/27/2019 | San Diego | USA | Right | Right | 6' 0" | 180 lbs | - |
| Moyer, Mark | RP | Athletic Club KC Academy | 24 | 09/21/2019 | Tacoma | USA | Right | Right | 5' 10" | 175 lbs | - |
| Mugglestone, Dylan | RP | Richland Rails | 24 | 09/28/2019 | London | ENG | Left | Left | 6' 1" | 195 lbs | - |
| Mullinger, Martin | CF | Minnesota Loons | 21 | 05/25/2022 | Heswall | ENG | Right | Right | 6' 2" | 170 lbs | - |
| Mullins, Shawn | CF | Barton Springs Blues | 27 | 05/29/2016 | Kissimmee | USA | Right | Right | 6' 0" | 195 lbs | - |
| Murciano, León | C | Lake Minnetonka Love Boats | 25 | 09/02/2018 | Medellín | COL | Right | Right | 6' 4" | 215 lbs | - |
| Murphy, Ted | C | Asheville Highlanders | 27 | 04/30/2016 | Tracy | USA | Right | Right | 5' 11" | 225 lbs | - |
