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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MacDougal, Steve | SP | Ottawa Nationals | 24 | 06/25/2022 | Millington | USA | Right | Right | 6' 0" | 185 lbs | - |
| MacKinlay, Calum | LF | Lake Minnetonka Love Boats | 20 | 01/22/2026 | Holytown | SCO | Switch | Right | 6' 0" | 175 lbs | - |
| MacKissock, Tom | SP | Akron Blimps | 23 | 02/21/2023 | Rexburg | USA | Left | Left | 6' 1" | 200 lbs | - |
| Macías, Manuel | RP | Crescent City Krewe | 25 | 06/24/2021 | Santo Domingo | DOM | Right | Right | 5' 10" | 190 lbs | - |
| Madrid, Adrian | RP | Irving Blue Sox | 26 | 08/14/2020 | Pinebluff | USA | Right | Right | 6' 1" | 185 lbs | - |
| Maeda, Daisuke | SP | Casper Ghosts | 21 | 01/30/2025 | Nagoya | JPN | Right | Right | 6' 4" | 195 lbs | - |
| Maestas, Pedro | SP | Ottawa Nationals | 24 | 02/28/2022 | Valencia | VEN | Right | Right | 6' 4" | 200 lbs | - |
| Marks, Richard | RP | Irving Blue Sox | 28 | 07/04/2018 | Oklahoma City | USA | Right | Right | 6' 1" | 210 lbs | - |
| Martin, Dave | C | Crescent City Krewe | 23 | 01/27/2023 | Chicago | USA | Right | Right | 6' 1" | 200 lbs | - |
| Martínez, Armando | C | Ithaca Fighting Imps | 24 | 06/25/2022 | David | PAN | Left | Right | 6' 1" | 200 lbs | - |
| Martínez, Marcos | LF | Lancaster Farmers | 23 | 06/30/2023 | Higüey | DOM | Right | Right | 6' 2" | 195 lbs | - |
| Martínez, Raúl | SP | Ottawa Nationals | 24 | 05/02/2022 | Freeport | USA | Right | Right | 5' 10" | 185 lbs | - |
| Martínez, Robinson | RP | Barton Springs Blues | 26 | 04/26/2020 | Tipitapa | NCA | Left | Left | 6' 2" | 200 lbs | - |
| Matthews, Brian | RF | Akron Blimps | 26 | 04/01/2020 | Firthcliffe | USA | Right | Right | 6' 4" | 205 lbs | - |
| Maxwell, Al | SP | Casper Ghosts | 24 | 09/06/2022 | Rusk | USA | Right | Right | 6' 4" | 200 lbs | - |
| McDermott, Jim | 2B | Yakima Hops | 24 | 10/30/2022 | Beulah | USA | Right | Right | 6' 0" | 185 lbs | - |
| McGowan, Nolan | RP | Lancaster Farmers | 22 | 01/25/2024 | Lewisville | USA | Right | Right | 6' 4" | 210 lbs | - |
| McMahon, George | 1B | Asheville Highlanders | 26 | 06/14/2020 | Fern Creek | USA | Switch | Right | 6' 0" | 205 lbs | - |
| McMasters, Jayson | RP | Lake Minnetonka Love Boats | 23 | 11/13/2023 | Portland | USA | Right | Right | 5' 9" | 175 lbs | - |
| Medina, Felipe | SS | Akron Blimps | 26 | 12/20/2020 | Queens | USA | Right | Right | 6' 0" | 210 lbs | - |
| Miller, Barry | SS | Yakima Hops | 24 | 02/20/2022 | Harrisburg | USA | Right | Right | 6' 1" | 180 lbs | - |
| Miller, Dave | CL | Irving Blue Sox | 26 | 03/29/2020 | Houston | USA | Right | Right | 6' 4" | 200 lbs | - |
| Mills, Dave | SP | Barton Springs Blues | 26 | 06/20/2020 | Palatine | USA | Right | Right | 6' 6" | 225 lbs | - |
| Minor, Mike | RF | Asheville Highlanders | 25 | 01/24/2021 | Birmingham | USA | Left | Left | 6' 6" | 220 lbs | - |
| Mitchell, Anthony | DH | Crescent City Krewe | 25 | 06/06/2021 | Spring Green | USA | Right | Right | 6' 0" | 200 lbs | - |
| Mitchell, Jake | RP | Ithaca Fighting Imps | 28 | 05/11/2018 | Minot | USA | Right | Left | 5' 10" | 190 lbs | - |
| Molina, Iván | RP | Billings Polar Bears | 24 | 08/01/2022 | Monterrey | MEX | Right | Right | 6' 2" | 200 lbs | - |
| Mollema, Ramelan | RP | Billings Polar Bears | 24 | 12/07/2022 | Indio | USA | Right | Right | 5' 11" | 190 lbs | - |
| Morales, Miguel | RP | Akron Blimps | 25 | 06/27/2021 | Santo Domingo | DOM | Right | Right | 6' 3" | 195 lbs | - |
| Moran, Kevin | RP | Irving Blue Sox | 26 | 02/08/2020 | Livonia | USA | Right | Right | 6' 2" | 190 lbs | - |
| Morita, Hirokazu | SP | Casper Ghosts | 27 | 12/01/2019 | Sapporo | JPN | Right | Right | 6' 1" | 200 lbs | - |
| Morán, León | SP | Billings Polar Bears | 24 | 05/14/2022 | Uruca | CRC | Left | Left | 6' 6" | 195 lbs | - |
| Moya, James | 1B | Casper Ghosts | 23 | 08/02/2023 | Houston | USA | Left | Right | 6' 1" | 200 lbs | - |
| Moyer, Mark | SP | Akron Blimps | 27 | 09/21/2019 | Tacoma | USA | Right | Right | 5' 10" | 190 lbs | - |
| Márquez, Rafael | RP | Casper Ghosts | 26 | 01/18/2020 | San Lorenzo | PUR | Switch | Right | 6' 2" | 220 lbs | - |
