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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MacJarrow, Jeremy | 1B | Free Agent | 26 | 03/01/2022 | North Charleston | USA | Right | Right | 6' 0" | 200 lbs | - |
| Macrae, Matthew | SP | New Hampshire Fisher Cats | 24 | 11/04/2024 | Bonne Terre | USA | Left | Left | 6' 2" | 165 lbs | - |
| Madden, Billy | RF | Binghamton Mets | 22 | 01/12/2026 | Lévis | CAN | Left | Left | 5' 10" | 180 lbs | - |
| Maddin, Joe | RP | New Britain Rock Cats | 25 | 03/18/2023 | East Orange | USA | Right | Right | 6' 3" | 185 lbs | - |
| Madill, Jon | SP | Binghamton Mets | 23 | 04/23/2025 | Spring Valley | USA | Left | Left | 6' 6" | 200 lbs | - |
| Madrigal, José | CF | Free Agent | 28 | 12/29/2020 | Vega Alta | PUR | Switch | Right | 6' 4" | 200 lbs | - |
| Maldonado, Luis | RP | New Britain Rock Cats | 24 | 01/19/2024 | Santo Domingo | DOM | Right | Right | 6' 4" | 185 lbs | - |
| Manasco, Mike | 2B | Free Agent | 25 | 09/30/2023 | White Marsh | USA | Left | Right | 6' 2" | 195 lbs | - |
| Manes, Kevin | RP | New Hampshire Fisher Cats | 25 | 09/03/2023 | Freeport | USA | Right | Right | 6' 5" | 200 lbs | - |
| Margraf, Stan | CF | Harrisburg Senators | 24 | 08/22/2024 | Massena | USA | Left | Left | 6' 2" | 190 lbs | - |
| Markevich, Ernie | SS | Altoona Curve | 25 | 05/05/2023 | West Perrine | USA | Left | Right | 6' 2" | 200 lbs | - |
| Martínez, António | RP | Richmond Flying Squirrels | 26 | 10/30/2022 | Los Angeles | USA | Left | Right | 6' 4" | 195 lbs | - |
| Martínez, Jesús | 2B | New Britain Rock Cats | 24 | 04/23/2024 | La Vega | DOM | Left | Right | 6' 1" | 185 lbs | - |
| Martínez, Turi | SP | Free Agent | 29 | 12/01/2019 | Soledad | COL | Right | Right | 5' 10" | 185 lbs | - |
| Masten, Ron | 2B | Portland Sea Dogs | 25 | 09/02/2023 | Boaz | USA | Right | Right | 5' 10" | 190 lbs | - |
| Matos, Álex | CF | Altoona Curve | 24 | 08/17/2024 | Partido | DOM | Right | Left | 6' 3" | 200 lbs | - |
| Matsukawa, Shumei | RP | Bowie Baysox | 27 | 02/10/2021 | Cimarron Hills | USA | Left | Left | 6' 0" | 200 lbs | - |
| Mauduit, Daniel | SP | Free Agent | 26 | 08/17/2022 | North Vancouver | CAN | Right | Right | 6' 4" | 200 lbs | - |
| McKeeby, Jon | CL | New Britain Rock Cats | 24 | 02/16/2024 | Bowie | USA | Right | Right | 6' 2" | 195 lbs | - |
| McMorrow, Chuck | CF | Bowie Baysox | 25 | 07/10/2023 | Allen | USA | Switch | Right | 6' 2" | 200 lbs | - |
| McNeil, Dominic | 2B | New Britain Rock Cats | 24 | 10/23/2024 | Stony Point | USA | Right | Right | 6' 4" | 200 lbs | - |
| Meddings, Kevin | LF | Free Agent | 27 | 02/11/2021 | Kannapolis | USA | Left | Right | 6' 1" | 200 lbs | - |
| Medina, António | RF | Reading Fightin Phils | 22 | 08/23/2026 | Villa Madero | MEX | Left | Left | 6' 1" | 175 lbs | - |
| Medina, Jesús | RP | Erie SeaWolves | 26 | 09/15/2022 | Fountainbleau | USA | Right | Left | 6' 3" | 200 lbs | - |
| Menconi, Tim | 2B | Erie SeaWolves | 25 | 01/20/2023 | Orrville | USA | Right | Right | 6' 4" | 205 lbs | - |
| Metta, Artie | SS | Binghamton Mets | 23 | 05/19/2025 | Clearwater | USA | Right | Right | 6' 1" | 195 lbs | - |
| Milloway, P.J. | LF | Free Agent | 26 | 04/20/2022 | New York | USA | Right | Right | 6' 2" | 195 lbs | - |
| Mills, Jim | SS | Reading Fightin Phils | 23 | 05/23/2025 | Clarksville | USA | Left | Right | 6' 3" | 200 lbs | - |
| Mirabile, Billy | SP | Akron RubberDucks | 23 | 05/23/2025 | New York | USA | Left | Left | 6' 11" | 220 lbs | - |
| Mirto, Daniel | RF | Akron RubberDucks | 22 | 04/10/2026 | Jacksonville | USA | Right | Right | 6' 1" | 190 lbs | - |
| Miyatake, Kazuki | LF | Akron RubberDucks | 25 | 07/29/2023 | Kochi | JPN | Right | Right | 6' 1" | 210 lbs | - |
| Mondschein, Billy | 1B | Akron RubberDucks | 23 | 07/15/2025 | Chalkville | USA | Left | Left | 6' 1" | 200 lbs | - |
| Montés, Daniel | RF | Portland Sea Dogs | 23 | 11/01/2025 | Marshfield | USA | Left | Left | 6' 7" | 200 lbs | - |
| Mora, António | RF | Portland Sea Dogs | 22 | 10/06/2026 | Corona | USA | Right | Right | 6' 2" | 190 lbs | - |
| Morales, José | RF | Free Agent | 27 | 04/10/2021 | Carolina | PUR | Left | Left | 6' 1" | 200 lbs | - |
| Moreno, Julián | RP | Binghamton Mets | 23 | 04/01/2025 | Santo Domingo | DOM | Switch | Right | 6' 1" | 175 lbs | - |
| Moschella, Curt | RP | Harrisburg Senators | 22 | 09/27/2026 | Jericho | USA | Switch | Left | 6' 2" | 200 lbs | - |
| Mosso, José | 1B | New Britain Rock Cats | 24 | 06/10/2024 | Boca Chica | DOM | Right | Right | 6' 2" | 190 lbs | - |
| Munyon, Artie | RF | Altoona Curve | 26 | 01/25/2022 | Watertown | USA | Right | Right | 6' 4" | 205 lbs | - |
| Muñóz, Mario | 2B | Binghamton Mets | 23 | 09/06/2025 | El Llano | DOM | Left | Right | 6' 1" | 190 lbs | - |
| Méndez, José | SS | Richmond Flying Squirrels | 25 | 03/30/2023 | Chicago | USA | Right | Right | 5' 9" | 180 lbs | - |
| Méndez, Pete | RF | Altoona Curve | 25 | 06/15/2023 | West Chicago | USA | Left | Left | 6' 2" | 195 lbs | - |
| Métais, Franck | LF | Akron RubberDucks | 22 | 06/19/2026 | Mantua Township | USA | Left | Left | 6' 5" | 190 lbs | - |
