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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MacGregor, Darrell | LF | Kansas Rainbeaus | 27 | 06/04/2021 | Monrovia | USA | Right | Right | 6' 1" | 205 lbs | - |
| Machehin, Leonid | LF | Alaskan Humpbacks | 29 | 02/09/2019 | Salsk | RUS | Left | Left | 6' 1" | 200 lbs | $600,000 |
| Mae, Haechan | 2B | Calgary Lynx | 29 | 04/03/2019 | Sinpo | PRK | Right | Right | 6' 4" | 200 lbs | $280,000 |
| Manaolana, Tangaloa | 1B | Plymouth Rocks | 27 | 03/24/2021 | Nuuuli | ASA | Right | Right | 6' 0" | 200 lbs | - |
| Mancebo, Jesús | C | Plymouth Rocks | 29 | 06/09/2019 | Ocós | GUA | Right | Right | 5' 11" | 200 lbs | - |
| Mander, Jerry | RP | Plymouth Rocks | 26 | 01/19/2022 | Los Angeles | USA | Left | Left | 6' 4" | 200 lbs | - |
| Manzanedo, Ignacio | RP | Alaskan Humpbacks | 30 | 12/17/2018 | Santa Cruz | ARG | Right | Right | 6' 1" | 190 lbs | $1,200,000 |
| Marshall, Richard | 3B | Sacramento Redlegs | 24 | 09/23/2024 | Edinburg | USA | Right | Right | 6' 0" | 200 lbs | - |
| Martin, Doug | RP | Plymouth Rocks | 22 | 02/20/2026 | East Rutherford | USA | Right | Right | 6' 2" | 200 lbs | - |
| Martínez, Jorge | SS | Bakersfield Nobles | 23 | 06/26/2025 | Ipís | CRC | Right | Right | 6' 2" | 175 lbs | $280,000 |
| Martínez, Juan | RF | Kansas Rainbeaus | 26 | 05/13/2022 | Carol City | USA | Left | Left | 6' 2" | 200 lbs | - |
| Martínez, Júlio | SS | Salt Lake City Buzz | 24 | 03/04/2024 | Jacó | CRC | Switch | Right | 6' 2" | 190 lbs | - |
| Mason, Alan | RP | Kansas Rainbeaus | 33 | 07/02/2015 | Wheeling | USA | Left | Right | 6' 3" | 225 lbs | $700,000 |
| Mason, Eric | RP | Free Agent | 30 | 12/14/2018 | Bakersfield | USA | Right | Right | 6' 3" | 200 lbs | - |
| Mastenbroek, Remco | RF | Alaskan Humpbacks | 29 | 09/01/2019 | Cole Bay | SIM | Left | Left | 6' 4" | 200 lbs | $280,000 |
| Maxwell, Woody | 3B | Hialeah Dodos | 29 | 10/08/2019 | Lodi | USA | Right | Right | 6' 4" | 215 lbs | - |
| McCarthy, Rick | 2B | Hialeah Dodos | 24 | 02/16/2024 | Oak Park | USA | Right | Right | 5' 11" | 185 lbs | - |
| McElroy, Danny | 2B | Free Agent | 26 | 07/06/2022 | Brooklyn | USA | Right | Right | 6' 0" | 195 lbs | - |
| McQueen, Stephen | RP | Free Agent | 27 | 01/03/2021 | Rosenberg | USA | Right | Right | 6' 2" | 200 lbs | - |
| McSweeny, Lee | CF | Athletic Club KC Reserves | 27 | 04/09/2021 | Albertville | USA | Right | Right | 6' 0" | 190 lbs | - |
| Mendoza, Tony | LF | Sacramento Redlegs | 25 | 02/17/2023 | Miami Lakes | USA | Right | Right | 6' 3" | 195 lbs | - |
| Mendoza, Vicente | C | Salt Lake City Buzz | 25 | 11/04/2023 | Tegucigalpa | HON | Right | Right | 6' 4" | 200 lbs | - |
| Michel, Erwan | 2B | Kansas Rainbeaus | 27 | 08/05/2021 | Saint-Just | FRA | Right | Right | 6' 3" | 200 lbs | - |
| Middleton, Jason | 3B | Free Agent | 29 | 07/08/2019 | Wichita | USA | Right | Right | 6' 2" | 195 lbs | - |
| Moody, Robert | SP | Bakersfield Nobles | 29 | 06/22/2019 | Grand Bay | USA | Right | Right | 5' 10" | 195 lbs | $280,000 |
| Moore, Tony | 3B | Free Agent | 28 | 05/21/2020 | Queens | USA | Right | Right | 6' 4" | 215 lbs | - |
| Morales, Omar | SP | Free Agent | 34 | 02/26/2014 | Santiago | DOM | Right | Right | 6' 3" | 205 lbs | - |
| Moreno, Diego | C | Alaskan Humpbacks | 30 | 11/10/2018 | Bryan | USA | Left | Right | 6' 0" | 195 lbs | - |
| Morin, Damien | RP | Bakersfield Nobles | 35 | 05/18/2013 | Chambray-lès-Tours | FRA | Left | Right | 6' 2" | 195 lbs | - |
| Morterero, Pablo | C | Kansas Rainbeaus | 28 | 09/16/2020 | Caracas | VEN | Right | Right | 6' 4" | 215 lbs | $280,000 |
| Morín, Miguel | C | Alaskan Humpbacks | 23 | 08/06/2025 | Santo Domingo | DOM | Left | Right | 6' 2" | 195 lbs | $280,000 |
| Mouland, Asher | SP | Calgary Lynx | 30 | 04/09/2018 | Montreal | CAN | Right | Right | 6' 4" | 220 lbs | $625,000 |
| Mueller, Joe | RF | Alaskan Humpbacks | 34 | 07/19/2014 | St. Joseph | USA | Right | Left | 6' 1" | 190 lbs | - |
| Muljana, Mulia | 3B | Hialeah Dodos | 35 | 02/24/2013 | Andover | USA | Right | Right | 5' 11" | 205 lbs | - |
| Mullinger, Martin | CF | Calgary Lynx | 26 | 05/25/2022 | Heswall | ENG | Right | Right | 6' 2" | 195 lbs | - |
| Murdoch, Jordan | RP | Jersey City Tritons | 27 | 05/30/2021 | Spanaway | USA | Right | Right | 6' 2" | 200 lbs | $280,000 |
| Murunga, Gaballah | LF | Salt Lake City Buzz | 21 | 04/25/2027 | Harare | ZIM | Left | Left | 6' 6" | 200 lbs | - |
| Méndez, Juan | 2B | Kansas Rainbeaus | 27 | 06/27/2021 | San Joaquín | VEN | Right | Right | 6' 3" | 200 lbs | - |
| Møller, Johan | SS | Athletic Club KC Reserves | 22 | 07/26/2026 | Aasiaat | GRL | Right | Right | 6' 1" | 180 lbs | - |
