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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Mack, Michael | C | Grand Forks Caterpillars | 23 | 06/17/2018 | Medford | USA | Right | Right | 5' 9" | 175 lbs | - |
| Mack, Stan | SS | Free Agent | 23 | 01/21/2018 | Oakland | USA | Right | Right | 6' 4" | 200 lbs | - |
| Madaev, Leo | SP | Alameda Airmen | 22 | 02/20/2019 | Moscow | RUS | Right | Right | 6' 1" | 185 lbs | - |
| Mae, Haechan | 2B | Walla Walla Walleye | 22 | 04/03/2019 | Sinpo | PRK | Right | Right | 6' 4" | 200 lbs | - |
| Maejima, Koryusai | DH | Columbia River Rats | 20 | 04/29/2021 | Fujisawa | JPN | Right | Right | 6' 0" | 190 lbs | - |
| Martin, Brian | C | Monroeville Yinzers | 22 | 10/27/2019 | Queens | USA | Right | Right | 6' 2" | 210 lbs | - |
| Martin, Carlton | SS | Walla Walla Walleye | 19 | 12/17/2022 | Olympia | USA | Right | Right | 6' 0" | 180 lbs | - |
| Martin, Edward | SP | Levittown Blue Dragons | 21 | 01/06/2020 | Beaumont | USA | Left | Right | 6' 6" | 210 lbs | - |
| Martínez, Luis | SP | Belleville Bulls | 22 | 07/11/2019 | Siguatepeque | HON | Right | Right | 6' 3" | 185 lbs | - |
| Marwan, Amani | RF | Columbia River Rats | 20 | 11/04/2021 | Juba | SSU | Left | Left | 6' 5" | 195 lbs | - |
| Mathews, Mark | C | Put-In-Bay BC | 23 | 07/29/2018 | Winchester | USA | Right | Right | 6' 0" | 205 lbs | - |
| Matsui, Junji | RF | Grand Forks Caterpillars | 21 | 01/12/2020 | Ebino | JPN | Left | Left | 6' 5" | 200 lbs | - |
| Matthews, Denny | RP | Yucca Valley Yellows | 24 | 06/23/2017 | New York | USA | Left | Right | 6' 5" | 220 lbs | - |
| Matthews, Tom | SP | Athletic Club KC U-24 | 21 | 04/11/2020 | Santa Clara | USA | Left | Right | 6' 0" | 185 lbs | - |
| McCarty, Ryan | LF | Monroeville Yinzers | 22 | 03/08/2019 | Wadsworth | USA | Right | Right | 6' 0" | 185 lbs | - |
| McCoy, Foster | RP | Alameda Airmen | 22 | 11/27/2019 | Carrollton | USA | Left | Right | 6' 0" | 190 lbs | - |
| McMillan, Tony | RF | Belleville Bulls | 25 | 12/25/2016 | Yardley | USA | Left | Left | 6' 4" | 210 lbs | - |
| Minor, Mike | RF | Columbia River Rats | 20 | 01/24/2021 | Birmingham | USA | Left | Left | 6' 6" | 220 lbs | - |
| Mitchell, Bruce | SP | Kennesaw Jets | 23 | 06/25/2018 | Denver | USA | Right | Right | 6' 2" | 185 lbs | - |
| Mitchell, Richard | CF | Put-In-Bay BC | 24 | 07/16/2017 | Hoyt Lakes | USA | Right | Right | 6' 0" | 185 lbs | - |
| Mndoyants, Tosya | SS | Athletic Club KC U-24 | 19 | 10/16/2022 | Gorelki | RUS | Switch | Right | 6' 4" | 190 lbs | - |
| Montoya, Inigo | CF | Free Agent | 22 | 11/08/2019 | Ferrol | ESP | Switch | Right | 6' 2" | 180 lbs | - |
| Moore, Jeff | CL | Put-In-Bay BC | 24 | 05/14/2017 | Kahuku | USA | Right | Right | 6' 2" | 195 lbs | - |
| Moore, Ralph | SP | Belleville Bulls | 24 | 11/07/2017 | Massillon | USA | Left | Left | 6' 4" | 210 lbs | - |
| Morales, Alfredo | RP | Walla Walla Walleye | 20 | 10/18/2021 | San Rafael Abajo | CRC | Left | Left | 6' 2" | 185 lbs | - |
| Morgan, John | RP | Athletic Club KC U-24 | 22 | 10/12/2019 | Richardson | USA | Right | Right | 5' 10" | 170 lbs | - |
| Morín, Ernesto | SP | Alameda Airmen | 23 | 06/07/2018 | Cueramaro | MEX | Right | Right | 6' 1" | 195 lbs | - |
| Morris, Millard | 2B | Alameda Airmen | 22 | 03/27/2019 | San Diego | USA | Right | Right | 6' 0" | 175 lbs | - |
| Möttölä, Kaaleppi | SS | Kennesaw Jets | 21 | 10/13/2020 | Salo | FIN | Right | Right | 6' 2" | 170 lbs | - |
| Moyer, Mark | RP | Athletic Club KC U-24 | 22 | 09/21/2019 | Tacoma | USA | Right | Right | 5' 10" | 175 lbs | - |
| Mullinger, Martin | CF | Walla Walla Walleye | 19 | 05/25/2022 | Heswall | ENG | Right | Right | 6' 2" | 170 lbs | - |
| Mullins, Bud | CF | Put-In-Bay BC | 22 | 02/27/2019 | Manhattan | USA | Right | Right | 6' 1" | 175 lbs | - |
| Muńóz, Mario | RF | Idaho Falls Chukars | 22 | 05/20/2019 | Santo Domingo | DOM | Right | Right | 6' 2" | 190 lbs | - |
