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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MacKinder, Daniel | CF | Quebec City Baby Blues | 18 | 01/17/2021 | Warsop | ENG | Right | Right | 6' 2" | 185 lbs | - |
| Madaev, Leo | SP | Ballard Beavers | 20 | 02/20/2019 | Moscow | RUS | Right | Right | 6' 1" | 175 lbs | - |
| Mancebo, Jesús | C | Ladue Rams | 20 | 06/09/2019 | Ocós | GUA | Right | Right | 5' 11" | 180 lbs | - |
| Marrero, Pedro | C | Ladue Rams | 21 | 04/30/2018 | Vilafranca del Penedès | ESP | Left | Right | 6' 0" | 200 lbs | - |
| Martin, Duane | RP | Amarillo Warheads | 18 | 07/09/2021 | Rockford | USA | Left | Left | 6' 2" | 180 lbs | - |
| Martin, Edward | SP | Phoenix Hotspur Academy | 19 | 01/06/2020 | Beaumont | USA | Left | Right | 6' 6" | 205 lbs | - |
| Martínez, Javier | RP | Ballard Beavers | 20 | 10/19/2019 | Ipís | CRC | Right | Right | 6' 4" | 185 lbs | - |
| Martínez, José | RP | Free Agent | 23 | 12/29/2016 | Pucallpa | PER | Left | Left | 6' 5" | 205 lbs | - |
| Martínez, Rafael | RF | Ladue Rams | 20 | 05/16/2019 | San Josecito | CRC | Left | Left | 6' 1" | 180 lbs | - |
| Mason, Steve | RP | Ladue Rams | 21 | 07/02/2018 | Indianapolis | USA | Left | Left | 6' 2" | 185 lbs | - |
| Matsunaga, Kiyotaka | RP | Amarillo Warheads | 20 | 10/28/2019 | Katano | JPN | Left | Left | 6' 2" | 175 lbs | - |
| Maxwell, Woody | 3B | Quebec City Baby Blues | 20 | 10/08/2019 | Lodi | USA | Right | Right | 6' 4" | 195 lbs | - |
| McCourtney, Jim | SS | Amarillo Warheads | 20 | 04/21/2019 | Riviera Beach | USA | Right | Right | 6' 2" | 185 lbs | - |
| Medina, Carlos | SP | Hicksville Hounds | 19 | 04/08/2020 | Oceanside | USA | Left | Left | 6' 2" | 180 lbs | - |
| Medina, Manny | 1B | Free Agent | 22 | 08/21/2017 | Managua | NCA | Left | Left | 5' 10" | 185 lbs | - |
| Medlen, Lynn | SS | Quebec City Baby Blues | 19 | 08/19/2020 | White Lake Township | USA | Right | Right | 6' 4" | 195 lbs | - |
| Méndez, Ricardo | SP | Franklin Fire | 20 | 06/14/2019 | Santo Domingo | DOM | Left | Left | 6' 6" | 195 lbs | - |
| Miah, Marika | 1B | Amarillo Warheads | 21 | 02/25/2018 | Faleniu | ASA | Left | Left | 6' 3" | 210 lbs | - |
| Michaud, Kyle | SS | Long Island Ducks | 20 | 09/08/2019 | Toronto | CAN | Right | Right | 6' 1" | 175 lbs | - |
| Miller, Dave | SP | Franklin Fire | 19 | 03/29/2020 | Houston | USA | Right | Right | 6' 4" | 190 lbs | - |
| Montoya, Pedro | SS | Moose Jaw Canucks | 18 | 05/17/2021 | San José | CRC | Right | Right | 6' 0" | 165 lbs | - |
| Morales, Juan | SS | Ladue Rams | 19 | 02/06/2020 | Weymouth | USA | Right | Right | 6' 5" | 195 lbs | - |
| Morita, Hirokazu | SP | Ellesmere Island Snowpeople | 20 | 12/01/2019 | Sapporo | JPN | Right | Right | 6' 1" | 185 lbs | - |
| Morris, Millard | 2B | Ballard Beavers | 20 | 03/27/2019 | San Diego | USA | Right | Right | 6' 0" | 175 lbs | - |
| Mugglestone, Dylan | CL | Ladue Rams | 20 | 09/28/2019 | London | ENG | Left | Left | 6' 1" | 180 lbs | - |
| Muñóz, Mario | CF | Free Agent | 20 | 05/20/2019 | Santo Domingo | DOM | Right | Right | 6' 2" | 185 lbs | - |
