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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MacBrayne, Daniel | LF | Yakima Hops | 22 | 09/07/2020 | San Diego | USA | Left | Left | 6' 5" | 220 lbs | - |
| Mack, Michael | C | Billings Polar Bears | 24 | 06/17/2018 | Medford | USA | Right | Right | 5' 9" | 175 lbs | - |
| Maddox, Spencer | 3B | Lake Minnetonka Love Boats | 22 | 02/24/2020 | Tulsa | USA | Switch | Right | 6' 0" | 185 lbs | - |
| Mae, Haechan | 2B | Minnesota Loons | 23 | 04/03/2019 | Sinpo | PRK | Right | Right | 6' 4" | 205 lbs | - |
| Magana, Domingo | C | Athletic Club KC Academy | 22 | 04/21/2020 | El Tocuyo | VEN | Right | Right | 6' 2" | 200 lbs | - |
| Makepeace, Zak | 3B | Irving Blue Sox | 25 | 11/10/2017 | Kingston | JAM | Left | Right | 6' 1" | 200 lbs | - |
| Martin, Brian | C | Squirrel Hill Pierogis | 23 | 10/27/2019 | Queens | USA | Right | Right | 6' 2" | 215 lbs | - |
| Martin, Donald | CF | Barton Springs Blues | 25 | 07/25/2017 | Shrewsbury | USA | Right | Right | 6' 4" | 210 lbs | - |
| Martin, Joe | SP | Lake Minnetonka Love Boats | 26 | 08/15/2016 | Sunrise Manor | USA | Right | Right | 6' 4" | 210 lbs | - |
| Martínez, Rafael | SP | Lake Minnetonka Love Boats | 24 | 12/02/2018 | Santo Domingo | DOM | Right | Right | 6' 5" | 205 lbs | - |
| Matsui, Hyosuke | RP | Asheville Highlanders | 26 | 04/13/2016 | Nachikatsuura | JPN | Right | Right | 6' 3" | 205 lbs | - |
| Matthews, Denny | RP | Barton Springs Blues | 25 | 06/23/2017 | New York | USA | Left | Right | 6' 5" | 220 lbs | - |
| Maynard, Roy | RF | Billings Polar Bears | 24 | 01/21/2018 | Tempe | USA | Switch | Left | 6' 6" | 225 lbs | - |
| McCarty, Ryan | LF | Squirrel Hill Pierogis | 23 | 03/08/2019 | Wadsworth | USA | Right | Right | 6' 0" | 185 lbs | - |
| McCoy, Foster | RP | Yakima Hops | 23 | 11/27/2019 | Carrollton | USA | Left | Right | 6' 0" | 195 lbs | - |
| McDonald, Chris | SP | Yakima Hops | 26 | 11/21/2016 | Duarte | USA | Right | Right | 6' 2" | 210 lbs | - |
| McGee, Anthony | 3B | Bethesda Atoms | 24 | 04/29/2018 | Carson City | USA | Right | Right | 6' 5" | 225 lbs | - |
| McGrady, Bobby | LF | Richland Rails | 27 | 04/29/2015 | Salisbury | USA | Left | Left | 6' 1" | 210 lbs | - |
| Mears, Mark | 3B | Asheville Highlanders | 23 | 03/14/2019 | Newburgh | USA | Left | Right | 5' 9" | 180 lbs | - |
| Medina, Manny | 1B | Bethesda Atoms | 25 | 08/21/2017 | Managua | NCA | Left | Left | 5' 10" | 200 lbs | - |
| Milic, Milos | 1B | Athletic Club KC Academy | 24 | 08/08/2018 | Sivacevo | BUL | Right | Right | 6' 1" | 210 lbs | - |
| Miller, Dave | RP | Irving Blue Sox | 22 | 03/29/2020 | Houston | USA | Right | Right | 6' 4" | 200 lbs | - |
| Mireles, Juan | LF | Free Agent | 25 | 01/13/2017 | Mexico City | MEX | Right | Right | 6' 3" | 200 lbs | - |
| Mitchell, Richard | CF | Marquette Miners | 25 | 07/16/2017 | Hoyt Lakes | USA | Right | Right | 6' 0" | 185 lbs | - |
| Mndoyants, Tosya | SS | Athletic Club KC Academy | 20 | 10/16/2022 | Gorelki | RUS | Switch | Right | 6' 4" | 190 lbs | - |
| Molina, Vicente | SP | Asheville Highlanders | 23 | 07/17/2019 | Brooklyn | USA | Right | Right | 6' 1" | 185 lbs | - |
| Montgomery, Alvin | LF | Billings Polar Bears | 24 | 04/16/2018 | Mesa | USA | Left | Left | 6' 4" | 205 lbs | - |
| Moore, Jeff | CL | Marquette Miners | 25 | 05/14/2017 | Kahuku | USA | Right | Right | 6' 2" | 200 lbs | - |
| Moran, Kevin | RP | Irving Blue Sox | 22 | 02/08/2020 | Livonia | USA | Right | Right | 6' 2" | 180 lbs | - |
| Morel, Franck | 1B | Squirrel Hill Pierogis | 23 | 10/28/2019 | Guérande | FRA | Right | Right | 6' 3" | 220 lbs | - |
| Morín, Ernesto | SP | Yakima Hops | 24 | 06/07/2018 | Cueramaro | MEX | Right | Right | 6' 1" | 195 lbs | - |
| Morris, Frank | RF | Asheville Highlanders | 27 | 01/11/2015 | Zephyrhills South | USA | Left | Left | 6' 5" | 225 lbs | - |
| Moy, Jang-lu | RP | Squirrel Hill Pierogis | 25 | 07/07/2017 | Taipei | TPE | Left | Left | 6' 2" | 200 lbs | - |
| Moyer, Mark | RP | Athletic Club KC Academy | 23 | 09/21/2019 | Tacoma | USA | Right | Right | 5' 10" | 175 lbs | - |
| Mullinger, Martin | CF | Minnesota Loons | 20 | 05/25/2022 | Heswall | ENG | Right | Right | 6' 2" | 170 lbs | - |
| Mullins, Shawn | CF | Barton Springs Blues | 26 | 05/29/2016 | Kissimmee | USA | Right | Right | 6' 0" | 190 lbs | - |
| Muńóz, António | CF | Squirrel Hill Pierogis | 28 | 03/02/2014 | New York | USA | Left | Right | 6' 2" | 200 lbs | - |
| Muńóz, Mario | RF | Free Agent | 23 | 05/20/2019 | Santo Domingo | DOM | Right | Right | 6' 2" | 195 lbs | - |
| Muńóz, Martín | C | Irving Blue Sox | 25 | 12/23/2017 | Mapastepec | MEX | Right | Right | 6' 1" | 210 lbs | - |
| Muńóz, Ramón | C | Bethesda Atoms | 28 | 04/12/2014 | Arraijan | PAN | Switch | Right | 6' 2" | 200 lbs | - |
| Murciano, León | C | Lake Minnetonka Love Boats | 24 | 09/02/2018 | Medellín | COL | Right | Right | 6' 4" | 210 lbs | - |
| Murphy, Ted | C | Asheville Highlanders | 26 | 04/30/2016 | Tracy | USA | Right | Right | 5' 11" | 220 lbs | - |
