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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Mace, Harry | RP | Washington Senators | 33 | 08/05/1870 | Washington | USA | Right | Right | 1.80 m | 83 kg | - |
| Maguire, Thomas | RP | Cincinnati Reds | 27 | 05/05/1876 | Unknown | USA | Right | Right | 1.78 m | 79 kg | - |
| Malarkey, John | RP | Washington Senators | 27 | 05/04/1876 | Springfield | USA | Right | Right | 1.80 m | 71 kg | - |
| Mann, Elijah | LF | Columbus Solons | 31 | 11/28/1872 | Lewisville | USA | Left | Left | 1.82 m | 92 kg | P750 |
| Mappes, George | 2B | Baltimore Orioles | 33 | 12/25/1869 | St. Louis | USA | Right | Right | 1.73 m | 90 kg | - |
| Mars, Ed | RP | Washington Senators | 32 | 12/04/1870 | Chicago | USA | Right | Right | 1.75 m | 80 kg | P800 |
| Martin, Jeremy | C | Pittsburgh Pirates | 36 | 07/01/1867 | Abilene | USA | Right | Right | 1.76 m | 92 kg | P750 |
| Massey, Bill | 1B | Cincinnati Reds | 28 | 01/05/1875 | Philadelphia | USA | Right | Right | 1.80 m | 78 kg | P650 |
| Mauer, Fred | CF | Columbus Solons | 34 | 11/30/1869 | Philadelphia | USA | Right | Right | 1.78 m | 80 kg | P600 |
| Maul, Al | RP | Washington Senators | 34 | 10/09/1869 | Philadelphia | USA | Right | Right | 1.83 m | 85 kg | P650 |
| McAllister, Sport | C | Cincinnati Reds | 25 | 07/23/1878 | Austin | USA | Switch | Right | 1.80 m | 81 kg | P650 |
| McBride, Pete | RP | Cleveland Spiders | 24 | 07/09/1879 | Adams | USA | Right | Right | 1.78 m | 78 kg | - |
| McCarthy, Jack | RF | Cincinnati Reds | 30 | 03/26/1873 | Hardwick | USA | Left | Left | 1.75 m | 72 kg | P600 |
| McCauley, Al | RP | Cincinnati Reds | 36 | 03/04/1867 | Indianapolis | USA | Left | Left | 1.83 m | 84 kg | P650 |
| McCauley, Bill | SS | Washington Senators | 29 | 12/20/1873 | Washington | USA | Right | Right | 1.78 m | 79 kg | - |
| McCormick, Moose | CF | Columbus Solons | 22 | 02/28/1881 | Philadelphia | USA | Left | Left | 1.80 m | 82 kg | P1,940 |
| McFarland, Chappie | SP | Pittsburgh Pirates | 28 | 03/13/1875 | Levittown | USA | Right | Right | 1.85 m | 87 kg | - |
| McFarland, Ed | 3B | Cleveland Spiders | 25 | 08/03/1878 | Cleveland | USA | Right | Right | 1.78 m | 83 kg | P1,100 |
| McGeachey, Jack | CF | Baltimore Orioles | 35 | 05/13/1868 | Clinton | USA | Right | Right | 1.73 m | 75 kg | P650 |
| McGinley, Jim | RP | Baltimore Orioles | 25 | 10/02/1878 | Groveland | USA | Right | Right | 1.83 m | 74 kg | - |
| McGinn, Frank | CF | Pittsburgh Pirates | 30 | 05/05/1873 | Cincinnati | USA | Right | Right | 1.78 m | 81 kg | P550 |
| McGraw, John | SS | Baltimore Orioles | 26 | 04/07/1877 | Truxton | USA | Left | Right | 1.71 m | 73 kg | P1,800 |
| McHale, Bob | CF | Washington Senators | 29 | 02/07/1874 | Sacramento | USA | Right | Right | 1.80 m | 69 kg | - |
| McJames, Doc | SP | Washington Senators | 25 | 08/27/1878 | Unknown | USA | Right | Right | 1.78 m | 81 kg | P1,100 |
| McKean, Ed | 1B | Cleveland Spiders | 35 | 06/06/1868 | Grafton | USA | Right | Right | 1.75 m | 79 kg | P1,600 |
| McKeon, Larry | CL | Washington Senators | 33 | 03/25/1870 | New York | USA | Right | Right | 1.78 m | 81 kg | P750 |
| McKeough, Dave | SS | Cleveland Spiders | 36 | 12/01/1867 | Utica | USA | Right | Right | 1.70 m | 75 kg | P600 |
| McMackin, Sam | RP | Cincinnati Reds | 31 | 01/24/1872 | Norris | USA | Left | Left | 1.83 m | 86 kg | P550 |
| McMakin, John | RP | Columbus Solons | 25 | 03/06/1878 | Unknown | USA | Right | Left | 1.80 m | 74 kg | P600 |
| McMullin, James | SP | Columbus Solons | 34 | 05/05/1869 | Unknown | USA | Right | Right | 1.78 m | 79 kg | - |
| McNabb, Edgar | SP | Baltimore Orioles | 34 | 10/24/1869 | Coshocton | USA | Right | Right | 1.80 m | 81 kg | - |
| Menefee, Jock | CL | Baltimore Orioles | 31 | 01/15/1872 | Rowlesburg | USA | Right | Right | 1.83 m | 75 kg | P1,780 |
| Mercer, Win | SP | Washington Senators | 25 | 06/20/1878 | Chester | USA | Right | Right | 1.70 m | 68 kg | P650 |
| Miller, Bob | RP | Columbus Solons | 31 | 05/05/1872 | Unknown | USA | Right | Right | 1.78 m | 79 kg | P650 |
| Miller, Dusty | 2B | Baltimore Orioles | 31 | 09/10/1872 | Oil City | USA | Left | Right | 1.80 m | 82 kg | P1,458 |
| Miller, Kohly | 3B | Washington Senators | 25 | 01/05/1878 | Unknown | USA | Right | Right | 1.76 m | 70 kg | - |
| Mohler, Kid | 2B | Washington Senators | 28 | 12/13/1874 | Oneida | USA | Right | Left | 1.63 m | 68 kg | - |
| Molesworth, Carlton | SP | Washington Senators | 23 | 02/15/1880 | Frederick | USA | Left | Left | 1.68 m | 90 kg | - |
| Moran, Charlie | RP | Columbus Solons | 25 | 02/22/1878 | Unknown | USA | Right | Right | 1.73 m | 81 kg | - |
| Moran, Sam | SP | Pittsburgh Pirates | 29 | 09/16/1874 | Rochester | USA | Right | Left | 1.78 m | 74 kg | - |
| Morgan, Cy | RP | Columbus Solons | 25 | 11/10/1878 | Unknown | USA | Right | Right | 1.83 m | 79 kg | P600 |
| Moriarty, George | 3B | Cincinnati Reds | 18 | 07/07/1885 | Upland | USA | Right | Right | 1.83 m | 84 kg | - |
| Morris, Ed | SP | Cleveland Spiders | 37 | 09/29/1866 | Brooklyn | USA | Switch | Left | 1.70 m | 75 kg | P1,300 |
| Morrison, Daniel | RP | Washington Senators | 35 | 11/25/1868 | Richardson | USA | Right | Right | 1.86 m | 89 kg | P650 |
| Morrison, Mike | SP | Pittsburgh Pirates | 32 | 02/06/1871 | Erie | USA | Right | Right | 1.73 m | 75 kg | P600 |
| Mullin, George | SP | Cincinnati Reds | 23 | 07/04/1880 | Unknown | USA | Right | Right | 1.80 m | 85 kg | P950 |
| Murphy, Connie | C | Cincinnati Reds | 29 | 11/01/1874 | Northfield | USA | Left | Right | 1.73 m | 71 kg | - |
| Murphy, Joe | RP | Baltimore Orioles | 33 | 09/07/1870 | St. Louis | USA | Right | Right | 1.80 m | 73 kg | - |
