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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MacDonald, Harold | SP | Free Agent | 30 | 01/16/2019 | Rosemont | USA | Right | Right | 6' 1" | 195 lbs | - |
| MacGregor, Darrell | LF | Mississippi Mockingbirds | 28 | 06/04/2021 | Monrovia | USA | Right | Right | 6' 1" | 205 lbs | $280,000 |
| MacKinder, Daniel | CF | Hollywood Shredders | 28 | 01/17/2021 | Warsop | ENG | Right | Right | 6' 2" | 200 lbs | $650,000 |
| Macías, António | 3B | Mississippi Mockingbirds | 30 | 02/22/2019 | San Nicolas | CRC | Right | Right | 6' 1" | 200 lbs | $19,000,000 |
| Major, Kelly | RP | Free Agent | 20 | 05/23/2029 | Jeffersonville | USA | Right | Right | 5' 9" | 160 lbs | - |
| Maneilli, Gian-Carlo | SP | Hollywood Shredders | 26 | 10/14/2023 | Caracas | VEN | Switch | Right | 6' 6" | 200 lbs | $280,000 |
| Mansilha, Marços | C | Nova Scotia Leviathan | 28 | 09/06/2021 | Jequié | BRA | Switch | Right | 6' 3" | 195 lbs | $19,800,000 |
| March, Conor | SP | Athletic Club KC | 26 | 02/12/2023 | Edmonton | CAN | Right | Right | 6' 0" | 195 lbs | $530,000 |
| Marley, Daniel | RF | Buffalo White Walkers | 28 | 03/28/2021 | Bath | ENG | Right | Right | 6' 4" | 200 lbs | $7,650,000 |
| Martínez, Eduardo | RP | San Mateo Dirty Reds | 25 | 12/16/2024 | Selden | USA | Left | Left | 6' 2" | 200 lbs | $280,000 |
| Martínez, Francisco | RP | Free Agent | 17 | 02/27/2032 | Pullman | USA | Left | Left | 6' 9" | 205 lbs | - |
| Mason, Alan | RP | Mississippi Mockingbirds | 34 | 07/02/2015 | Wheeling | USA | Left | Right | 6' 3" | 220 lbs | $700,000 |
| Mason, Eric | RP | San Mateo Dirty Reds | 31 | 12/14/2018 | Bakersfield | USA | Right | Right | 6' 3" | 205 lbs | $280,000 |
| Matsumoto, Tetsu | 1B | Buffalo White Walkers | 33 | 11/04/2016 | Tokyo | JPN | Switch | Right | 6' 1" | 200 lbs | $19,000,000 |
| May, Derek | RP | Greenville 84s | 32 | 08/31/2017 | Woodstock | USA | Left | Right | 5' 10" | 175 lbs | $3,700,000 |
| McCusker, Jack | CF | Hollywood Shredders | 30 | 03/03/2019 | Newark | USA | Left | Left | 6' 4" | 200 lbs | $700,000 |
| McFarland, Jeff | SP | Northern Virginia Rainbow Mermaids | 25 | 02/03/2024 | Palmdale | USA | Right | Right | 5' 9" | 175 lbs | $470,000 |
| McKendrick, Ray | RP | Athletic Club KC | 33 | 11/12/2016 | Rutherford | USA | Left | Right | 6' 0" | 205 lbs | $990,000 |
| McLean, George | RF | San Mateo Dirty Reds | 28 | 11/10/2021 | South Miami | USA | Left | Left | 6' 2" | 205 lbs | $280,000 |
| Medina, Rafael | RP | Baltimore Bullets | 26 | 11/21/2023 | Lincolnia | USA | Left | Left | 6' 4" | 200 lbs | $280,000 |
| Menéndez, Armando | SP | Athletic Club KC | 16 | 11/15/2033 | Nueva San Salvador | SLV | Left | Right | 6' 1" | 170 lbs | - |
| Meyers, Jeffery | RP | Hollywood Shredders | 34 | 03/07/2015 | Manchester Center | USA | Left | Left | 6' 1" | 200 lbs | $14,200,000 |
| Mi, Wen | LF | Vancouver Grey Wolves | 23 | 03/13/2026 | Keelung | TPE | Left | Left | 6' 0" | 185 lbs | $280,000 |
| Michel, Erwan | 2B | Mississippi Mockingbirds | 28 | 08/05/2021 | Saint-Just | FRA | Right | Right | 6' 3" | 200 lbs | $280,000 |
| Milatovic, Boris | RP | Mississippi Mockingbirds | 29 | 06/24/2020 | Asenovgrad | BUL | Right | Right | 5' 10" | 175 lbs | $5,750,000 |
| Miller, Bernard | RP | Mississippi Mockingbirds | 26 | 06/03/2023 | Washington | USA | Left | Left | 6' 1" | 180 lbs | $280,000 |
| Miller, Lee | C | Free Agent | 24 | 07/05/2025 | Aurora | USA | Right | Right | 6' 0" | 190 lbs | - |
| Miniato, Costanzo | SP | Mississippi Mockingbirds | 28 | 08/05/2021 | Bellizzi | ITA | Right | Right | 6' 3" | 195 lbs | $700,000 |
| Mndoyants, Tosya | SS | Athletic Club KC | 27 | 10/16/2022 | Gorelki | RUS | Switch | Right | 6' 4" | 200 lbs | $17,000,000 |
| Montgomery, Lee | SS | San Mateo Dirty Reds | 27 | 12/05/2022 | Miami | USA | Right | Right | 6' 0" | 190 lbs | $280,000 |
| Montés, Jaime | CF | Free Agent | 30 | 05/25/2019 | Constitución | CHI | Right | Right | 6' 2" | 200 lbs | - |
| Mouland, Asher | RP | Vancouver Grey Wolves | 31 | 04/09/2018 | Montreal | CAN | Right | Right | 6' 4" | 215 lbs | $685,000 |
| Moya, Ricardo | SP | Greenville 84s | 16 | 05/02/2033 | Madrid | ESP | Left | Left | 6' 2" | 175 lbs | - |
| Myoga, Masao | RP | Nova Scotia Leviathan | 31 | 02/10/2018 | Tokyo | JPN | Right | Right | 6' 3" | 200 lbs | $280,000 |
| Møller, Johan | SS | Athletic Club KC | 23 | 07/26/2026 | Aasiaat | GRL | Right | Right | 6' 1" | 185 lbs | $280,000 |
