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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MacComie, Derrick | CF | Westwood Sixshooters | 26 | 05/03/2025 | Atlanta | USA | Right | Right | 6' 4" | 205 lbs | - |
| MacKinlay, George | RP | Billings Polar Bears | 25 | 10/22/2026 | Spring | USA | Right | Right | 6' 2" | 200 lbs | - |
| MacNiven, Jeff | RP | Lancaster Farmers | 24 | 03/02/2027 | Bronx | USA | Left | Left | 6' 0" | 190 lbs | - |
| Markus, Roald | 2B | Northville Eclipse | 25 | 11/27/2026 | Willemstad | CUR | Switch | Right | 6' 3" | 200 lbs | - |
| Marr, Samuel | 2B | Casper Ghosts | 27 | 12/09/2024 | Falmouth | JAM | Switch | Right | 6' 1" | 200 lbs | $280,000 |
| Martin, Marc | C | Ottawa Nationals | 25 | 12/29/2026 | Carrefour | HAI | Right | Right | 6' 1" | 200 lbs | - |
| Martinez, Bastien | RP | Northville Eclipse | 26 | 08/22/2025 | Port-au-Prince | HAI | Right | Right | 6' 4" | 200 lbs | - |
| Martínez, Julian | C | Marquette Miners | 25 | 04/26/2026 | Belize | BLZ | Right | Right | 6' 0" | 205 lbs | - |
| Marín, Cris | 3B | Free Agent | 27 | 01/16/2024 | Delta del Tigre | CRC | Switch | Right | 6' 1" | 200 lbs | - |
| Mata, Héctor | LF | Billings Polar Bears | 22 | 01/09/2029 | Cotuí | DOM | Switch | Right | 6' 2" | 190 lbs | - |
| May, Pat | LF | Lancaster Farmers | 25 | 09/02/2026 | Westwood | USA | Left | Left | 6' 0" | 200 lbs | - |
| McAllister, David | LF | Tacoma Fur Traders | 26 | 06/07/2025 | New York | USA | Left | Right | 6' 4" | 205 lbs | - |
| McCarthy, Gil | SP | Providence Pilgrims | 27 | 07/18/2024 | Los Angeles | USA | Switch | Right | 6' 1" | 200 lbs | - |
| McClerey, Will | C | Westwood Sixshooters | 22 | 12/08/2029 | Miami | USA | Right | Right | 5' 11" | 190 lbs | - |
| McClure, Ambrose | RP | Marquette Miners | 29 | 09/26/2022 | San Antonio | USA | Right | Right | 6' 1" | 195 lbs | - |
| McCoy, Bo | CF | Tacoma Fur Traders | 25 | 03/03/2026 | Somerville | USA | Right | Right | 6' 2" | 200 lbs | - |
| McDonald, Jimmy | SP | Westwood Sixshooters | 28 | 01/26/2023 | Santa Ana | USA | Left | Right | 6' 8" | 200 lbs | - |
| McKee, Dusty | SP | Providence Pilgrims | 26 | 03/03/2025 | Long View | USA | Left | Left | 6' 4" | 195 lbs | - |
| McKinley, Dave | 2B | Arizona Javelina | 24 | 10/22/2027 | Grand Canyon Village | USA | Right | Right | 6' 0" | 195 lbs | - |
| Meade, Waylon | 3B | Arizona Javelina | 22 | 07/21/2029 | Port Charlotte | USA | Switch | Right | 6' 3" | 200 lbs | - |
| Medina, César | SS | Lancaster Farmers | 24 | 11/02/2027 | Staten Island | USA | Left | Right | 6' 1" | 185 lbs | - |
| Mendoza, Ramón | RP | Tacoma Fur Traders | 25 | 11/01/2026 | Dangriga | BLZ | Left | Right | 6' 4" | 200 lbs | - |
| Merced, Román | CF | Casper Ghosts | 21 | 05/21/2030 | Neuquén | ARG | Left | Left | 6' 1" | 170 lbs | - |
| Mercier, Antoine | 3B | Minnesota Loons | 25 | 06/23/2026 | Les Ulis | FRA | Left | Right | 6' 1" | 195 lbs | - |
| Meredith, Elwood | RP | Arizona Javelina | 24 | 03/09/2027 | Yardville-Groveville | USA | Left | Left | 6' 4" | 205 lbs | - |
| Mermea, Juan | RP | Providence Pilgrims | 23 | 03/01/2028 | Apopa | SLV | Right | Right | 6' 4" | 205 lbs | - |
| Meza, Paco | SP | Tacoma Fur Traders | 26 | 10/17/2025 | New York | USA | Right | Right | 6' 4" | 200 lbs | - |
| Miyazaki, Yasuoka | SP | Casper Ghosts | 22 | 01/21/2029 | Akita | JPN | Switch | Right | 6' 4" | 200 lbs | - |
| Mooney, Greg | 1B | Northville Eclipse | 29 | 10/20/2022 | Nashville | USA | Right | Right | 6' 0" | 210 lbs | - |
| Morales, Jimmy | RP | Minnesota Loons | 23 | 01/13/2028 | Sharonville | USA | Right | Right | 6' 3" | 200 lbs | - |
| Morales, Juan | RP | Providence Pilgrims | 25 | 02/27/2026 | Tlalnepantla | MEX | Left | Left | 5' 9" | 165 lbs | - |
| Morris, Joe | RP | Marquette Miners | 28 | 09/04/2023 | Staten Island | USA | Switch | Right | 6' 6" | 215 lbs | - |
| Morse, Ethan | RP | Ottawa Nationals | 26 | 04/03/2025 | Somerset | USA | Right | Right | 6' 2" | 200 lbs | - |
| Murillo, Miguel | SP | Casper Ghosts | 26 | 08/11/2025 | Arlington | USA | Right | Right | 5' 9" | 175 lbs | - |
| Murray, George | RP | Minnesota Loons | 28 | 01/19/2023 | Sunrise Manor | USA | Right | Right | 6' 3" | 200 lbs | - |
| Myers, Paul | LF | Lancaster Farmers | 26 | 09/07/2025 | Central Islip | USA | Left | Right | 6' 0" | 195 lbs | - |
