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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MacAlonie, Jack | RP | Baton Rouge Brass | 28 | 02/08/2027 | Milton | USA | Right | Right | 6' 2" | 200 lbs | - |
| Macazaga, Luis | CF | Bakersfield Nobles | 31 | 06/28/2023 | Higüey | DOM | Right | Right | 6' 4" | 200 lbs | - |
| MacBrayne, Daniel | LF | Athletic Club KC Reserves | 34 | 09/07/2020 | San Diego | USA | Left | Left | 6' 5" | 200 lbs | - |
| MacLellan, Lawrence | SP | Bakersfield Nobles | 24 | 03/30/2031 | Corpus Christi | USA | Switch | Right | 6' 4" | 205 lbs | - |
| Macías, Carlos | LF | Free Agent | 27 | 06/24/2027 | Puente Alto | CHI | Left | Left | 5' 10" | 195 lbs | - |
| Maekawa, Yoichibei | RP | Syracuse Starks | 33 | 08/05/2021 | Kannami | JPN | Left | Left | 6' 0" | 200 lbs | - |
| Mann, Hugh | RP | Sioux Falls Red Pandas | 29 | 06/13/2025 | Columbus | USA | Right | Right | 6' 0" | 190 lbs | - |
| Manning, Rex | SP | Pennsauken Flyers | 24 | 04/05/2031 | Neenah | USA | Right | Right | 6' 1" | 205 lbs | - |
| Martin, Doug | RP | Plymouth Rocks | 29 | 02/20/2026 | East Rutherford | USA | Right | Right | 6' 2" | 200 lbs | $280,000 |
| Martínez, Juan | 3B | Pennsauken Flyers | 24 | 11/19/2030 | Tocumen | PAN | Right | Right | 6' 2" | 200 lbs | - |
| Martínez, Ricardo | LF | Pennsauken Flyers | 25 | 02/21/2030 | Suamico | USA | Right | Left | 6' 3" | 200 lbs | - |
| Marín, Fernando | RP | Athletic Club KC Reserves | 30 | 02/01/2025 | Seminole Manor | USA | Switch | Left | 6' 0" | 195 lbs | - |
| Mason, Eric | RP | Athletic Club KC Reserves | 36 | 12/14/2018 | Bakersfield | USA | Right | Right | 6' 3" | 200 lbs | - |
| McCaffery, Andrew | RF | Sioux Falls Red Pandas | 27 | 08/15/2027 | Cleburne | USA | Right | Right | 6' 4" | 200 lbs | - |
| McCall, Marvin | SP | Plymouth Rocks | 29 | 01/14/2026 | Opelousas | USA | Switch | Right | 6' 4" | 200 lbs | - |
| McElroy, Fred | SS | Pennsauken Flyers | 26 | 07/24/2028 | Riverside | USA | Left | Right | 6' 0" | 195 lbs | - |
| McGee, Andy | 3B | Milton Dogfish Head | 23 | 06/17/2031 | Visalia | USA | Left | Right | 6' 0" | 200 lbs | - |
| McMahon, Cate | SS | Plymouth Rocks | 26 | 01/24/2029 | Queens | USA | Right | Right | 6' 2" | 200 lbs | - |
| Medina, Vicente | RP | Sioux Falls Red Pandas | 33 | 01/07/2022 | Norfolk | USA | Left | Right | 6' 5" | 205 lbs | - |
| Mercier, Antoine | 3B | Sioux Falls Red Pandas | 28 | 06/23/2026 | Les Ulis | FRA | Left | Right | 6' 1" | 200 lbs | - |
| Mi, Wen | LF | Calgary Lynx | 29 | 03/13/2026 | Keelung | TPE | Left | Left | 6' 0" | 190 lbs | $875,000 |
| Milatovic, Boris | RP | Tortolita Drummers | 34 | 06/24/2020 | Asenovgrad | BUL | Right | Right | 5' 10" | 180 lbs | $2,600,000 |
| Miller, Jamie | RP | Athletic Club KC Reserves | 31 | 06/28/2023 | Maple Shade Township | USA | Switch | Right | 6' 2" | 195 lbs | $280,000 |
| Miller, John | 2B | Pennsauken Flyers | 26 | 01/01/2029 | Reno | USA | Switch | Right | 6' 0" | 195 lbs | - |
| Miranda, José | SP | Bakersfield Nobles | 23 | 01/01/2032 | Mission Bend | USA | Right | Right | 6' 2" | 200 lbs | - |
| Mitra, Daulat | SS | Bakersfield Nobles | 29 | 11/11/2025 | Noida | IND | Switch | Right | 5' 11" | 180 lbs | - |
| Monteblanco, Luis Miguel | RF | Plymouth Rocks | 33 | 06/02/2021 | Havana | CUB | Right | Right | 6' 0" | 200 lbs | $280,000 |
| Montés, Alberto | CF | Calgary Lynx | 23 | 10/09/2031 | Pine Bluff | USA | Left | Left | 6' 0" | 185 lbs | - |
| Morales, Alfredo | RP | Calgary Lynx | 33 | 10/18/2021 | San Rafael Abajo | CRC | Left | Left | 6' 2" | 200 lbs | - |
| Moreno, Armando | RP | Bakersfield Nobles | 29 | 10/03/2025 | San José | CRC | Right | Right | 6' 2" | 200 lbs | - |
| Moreno, Miguel | RP | Tortolita Drummers | 28 | 11/16/2026 | Santo Domingo | DOM | Right | Right | 6' 3" | 205 lbs | $900,000 |
| Morse, Freddie | CF | Pennsauken Flyers | 24 | 03/03/2031 | Vermilion | USA | Right | Right | 6' 0" | 200 lbs | $280,000 |
| Mullinger, Martin | 1B | Calgary Lynx | 32 | 05/25/2022 | Heswall | ENG | Right | Right | 6' 2" | 200 lbs | - |
| Myslajek, Pielgrzym | 3B | Free Agent | 31 | 06/22/2023 | Marijampole | LTU | Left | Right | 6' 0" | 200 lbs | - |
| Méndez, Mario | RP | Syracuse Starks | 29 | 03/12/2026 | San Miguel | SLV | Right | Right | 6' 2" | 200 lbs | - |
