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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Madden, Kid | SP | Boston Beaneaters | 32 | 10/02/1871 | Portland | USA | Left | Left | 1.70 m | 66 kg | - |
| Madison, Art | SS | Philadelphia Phillies | 29 | 01/14/1875 | Clarksburg | USA | Right | Right | 1.75 m | 77 kg | - |
| Mahoney, Mike | C | Boston Beaneaters | 26 | 12/05/1877 | Boston | USA | Right | Right | 1.93 m | 99 kg | - |
| Martin, Ken | RP | Philadelphia Phillies | 35 | 10/20/1868 | Austin | USA | Right | Right | 1.81 m | 85 kg | P600 |
| Mattern, Brent | RP | Philadelphia Phillies | 30 | 12/04/1873 | Tucson | USA | Right | Right | 1.72 m | 81 kg | P900 |
| McDermott, Michael | RP | Boston Beaneaters | 35 | 05/06/1868 | Fall River | USA | Right | Right | 1.78 m | 71 kg | P650 |
| McFetridge, Jack | RP | Philadelphia Phillies | 30 | 08/25/1873 | Philadelphia | USA | Right | Right | 1.83 m | 82 kg | - |
| McGann, Dan | 1B | Boston Beaneaters | 28 | 07/15/1875 | Shelbyville | USA | Switch | Right | 1.83 m | 87 kg | P1,500 |
| McMahon, Jack | C | New York Giants | 30 | 10/15/1873 | Waterbury | USA | Right | Left | 1.78 m | 80 kg | P550 |
| McNichol, Ed | RP | New York Giants | 25 | 01/10/1879 | Martins Ferry | USA | Right | Right | 1.65 m | 77 kg | - |
| Mertes, Sam | CF | Philadelphia Phillies | 27 | 08/06/1876 | San Francisco | USA | Right | Right | 1.83 m | 103 kg | P800 |
| Meyer, John | CF | Buffalo Bisons | 37 | 07/16/1866 | Concord | USA | Right | Right | 1.77 m | 79 kg | P1,000 |
| Milton, Larry | RP | New York Giants | 24 | 05/04/1879 | Unknown | USA | Switch | Right | 1.83 m | 86 kg | - |
| Moore, Matt | C | Buffalo Bisons | 34 | 02/16/1869 | Sinton | USA | Switch | Right | 1.82 m | 100 kg | P600 |
| Moran, Charles | SS | Buffalo Bisons | 24 | 03/26/1879 | Unknown | USA | Switch | Right | 1.83 m | 87 kg | P550 |
| Motz, Frank | 1B | Philadelphia Phillies | 30 | 10/01/1873 | Freeburg | USA | Right | Right | 1.83 m | 76 kg | - |
| Murphy, Bob | RP | New York Giants | 33 | 12/26/1870 | Unknown | USA | Right | Right | 1.83 m | 79 kg | - |
| Murphy, Morgan | C | Philadelphia Phillies | 32 | 02/14/1871 | East Providence | USA | Right | Right | 1.73 m | 77 kg | P600 |
| Murphy, Yale | SS | New York Giants | 30 | 10/11/1873 | Southborough | USA | Left | Right | 1.60 m | 58 kg | P650 |
