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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Maas, Emil | SP | Pittsburgh Aces | 24 | 07/16/1951 | Milwaukee | USA | Left | Left | 6' 0" | 165 lbs | $18,000 |
| Mahoney, Les | RF | Toledo Tornados | 24 | 01/02/1951 | Rock Springs | USA | Right | Left | 6' 1" | 175 lbs | - |
| Makepeace, Leo | 3B | Free Agent | 29 | 02/14/1946 | Glens Falls | USA | Left | Right | 6' 0" | 200 lbs | - |
| Makin, Ed | CF | Pittsburgh Aces | 22 | 01/08/1953 | Great Falls | USA | Right | Right | 6' 1" | 175 lbs | $15,000 |
| Maldonado, Pedro | 1B | Buffalo Nickels | 23 | 08/17/1951 | Tijuana | MEX | Left | Left | 6' 0" | 220 lbs | - |
| Mance, Stan | 3B | Rochester Rooks | 23 | 06/14/1952 | Amsterdam | USA | Right | Right | 5' 9" | 165 lbs | - |
| Martinez, Dick | 1B | Free Agent | 29 | 11/27/1945 | Trenton | USA | Right | Right | 5' 7" | 185 lbs | - |
| Massey, Lou | RP | Richmond Rebels | 25 | 05/07/1950 | Atlanta | USA | Right | Left | 6' 0" | 180 lbs | - |
| Mather, Brooks | RP | Syracuse Excelsiors | 28 | 03/01/1947 | Columbus | USA | Right | Right | 5' 9" | 170 lbs | $63,000 |
| Matton, Mike | RF | Syracuse Excelsiors | 31 | 09/15/1943 | Winchester | USA | Right | Right | 6' 1" | 210 lbs | $53,000 |
| McIntyre, Al | SP | Rochester Rooks | 28 | 08/13/1946 | Springfield | USA | Left | Right | 6' 0" | 195 lbs | - |
| Meder, Ken | SP | Pittsburgh Aces | 25 | 08/16/1949 | Philadelphia | USA | Right | Right | 6' 2" | 180 lbs | - |
| Metcalf, Gail | RF | Buffalo Nickels | 25 | 01/31/1950 | Chicago | USA | Left | Left | 6' 4" | 200 lbs | - |
| Michaels, Bobby | 1B | Louisville Derbies | 26 | 04/15/1949 | Olympia | USA | Left | Right | 6' 0" | 195 lbs | - |
| Miller, Walter | SS | Pittsburgh Aces | 24 | 05/20/1951 | Washington | USA | Switch | Right | 6' 1" | 165 lbs | - |
| Mooney, Frank | 1B | Richmond Rebels | 25 | 04/16/1950 | San Francisco | USA | Left | Left | 6' 2" | 205 lbs | - |
| Moran, Dan | 2B | Buffalo Nickels | 22 | 10/04/1952 | Los Angeles | USA | Right | Right | 6' 1" | 190 lbs | - |
| Moran, Harry | LF | Free Agent | 25 | 05/02/1950 | Muskogee | USA | Left | Left | 6' 1" | 185 lbs | - |
| Morris, Allan | SP | Syracuse Excelsiors | 22 | 10/01/1952 | Elyria | USA | Left | Right | 6' 1" | 185 lbs | $15,000 |
| Morris, Virgil | CF | Richmond Rebels | 24 | 03/13/1951 | North Tustin | USA | Right | Right | 6' 1" | 175 lbs | - |
| Morton, Al | 1B | Syracuse Excelsiors | 24 | 07/12/1951 | New York | USA | Right | Right | 6' 1" | 180 lbs | - |
| Mosser, Bernie | RP | Richmond Rebels | 23 | 08/15/1951 | Brooklyn | USA | Switch | Left | 6' 1" | 180 lbs | - |
| Myers, Bert | C | Free Agent | 26 | 08/29/1948 | Allison Park | USA | Right | Right | 6' 1" | 195 lbs | - |
