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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Mackall, Larry | SP | Free Agent | 26 | 11/11/1860 | North Charleston | USA | Right | Right | 5' 10" | 190 lbs | - |
| Madson, Dave | RP | Allentown Peanuts | 26 | 10/09/1861 | Harrisburg | USA | Left | Right | 6' 0" | 190 lbs | - |
| Mandel, Art | SP | Hartford Hawks | 25 | 05/05/1862 | Bloomington | USA | Right | Right | 5' 9" | 185 lbs | - |
| Marks, Jumbo | SP | Albany Dutchmen | 28 | 06/16/1859 | Weedsport | USA | Right | Right | 5' 10" | 160 lbs | - |
| Martin, Dave | C | Newark Smiths | 28 | 08/15/1859 | Bridgeport | USA | Right | Right | 5' 10" | 190 lbs | - |
| Martin, Will | 1B | Free Agent | 29 | 03/02/1858 | Baltimore | USA | Switch | Right | 6' 0" | 190 lbs | - |
| Mascarenas, John | RP | Free Agent | 23 | 04/22/1864 | Philadelphia | USA | Switch | Left | 5' 11" | 185 lbs | - |
| Mathes, Bill | SP | Newark Smiths | 23 | 01/13/1864 | Philadelphia | USA | Right | Right | 5' 8" | 170 lbs | - |
| Mathis, Thomas | 3B | Providence Planters | 29 | 04/25/1858 | Columbia | USA | Right | Right | 5' 10" | 190 lbs | - |
| Maupin, Ray | 3B | Free Agent | 27 | 01/30/1860 | Cicero | USA | Right | Right | 5' 10" | 190 lbs | - |
| Mayette, Pat | CF | Allentown Peanuts | 26 | 04/06/1861 | Highlands Ranch | USA | Right | Right | 5' 11" | 175 lbs | - |
| McCann, Jim | SP | Scranton Anthracites | 26 | 10/06/1861 | Royal Oak | USA | Right | Right | 5' 11" | 175 lbs | - |
| McGraw, Leo | LF | Hartford Hawks | 29 | 08/22/1858 | Fairhaven | USA | Right | Right | 6' 0" | 165 lbs | - |
| McGuire, Jack | 2B | Hartford Hawks | 29 | 12/04/1857 | Cambridge | USA | Switch | Right | 6' 0" | 190 lbs | - |
| McLean, Gary | 3B | Free Agent | 27 | 04/30/1860 | Annandale | USA | Right | Right | 5' 10" | 190 lbs | - |
| McNally, Levi | SP | Free Agent | 28 | 04/25/1859 | Denver | USA | Right | Right | 5' 7" | 165 lbs | - |
| Menke, Eric | 1B | Hartford Hawks | 24 | 10/20/1863 | Guilford | USA | Switch | Right | 6' 1" | 175 lbs | - |
| Mercer, Ulysses | SP | Free Agent | 17 | 11/04/1869 | Philadelphia | USA | Right | Right | 5' 11" | 180 lbs | - |
| Messer, Julius | SP | Allentown Peanuts | 22 | 07/10/1865 | Manassas | USA | Right | Right | 6' 0" | 190 lbs | - |
| Meyer, Allan | SS | Newark Smiths | 27 | 02/18/1860 | Leominster | USA | Right | Right | 5' 10" | 190 lbs | - |
| Miller, Gus | SP | Providence Planters | 33 | 08/19/1854 | Philadelphia | USA | Right | Right | 5' 11" | 175 lbs | - |
| Miller, Henry | RP | Providence Planters | 28 | 04/25/1859 | Albany | USA | Right | Right | 5' 10" | 190 lbs | - |
| Miller, Scott | SP | Scranton Anthracites | 18 | 03/22/1869 | Wayne | USA | Switch | Right | 6' 2" | 205 lbs | - |
| Mitchell, Andrew | CF | Free Agent | 25 | 05/26/1862 | Wheaton | USA | Left | Right | 6' 2" | 175 lbs | - |
| Mitchell, George | 2B | Free Agent | 29 | 03/02/1858 | Philadelphia | USA | Right | Right | 5' 10" | 190 lbs | - |
| Monk, Jim | SS | Free Agent | 22 | 10/23/1864 | Philadelphia | USA | Right | Right | 5' 6" | 150 lbs | - |
| Montgomery, Will | RP | Free Agent | 26 | 12/12/1860 | Mason | USA | Right | Right | 5' 11" | 175 lbs | - |
| Morehead, Ken | C | Free Agent | 25 | 01/17/1862 | East St. Louis | USA | Switch | Right | 6' 0" | 185 lbs | $180 |
| Morton, Butch | RP | Providence Planters | 26 | 10/29/1860 | Aurora | USA | Right | Right | 5' 9" | 185 lbs | - |
| Mueller, William | RP | Free Agent | 27 | 03/20/1860 | Naugatuck | USA | Right | Right | 5' 10" | 190 lbs | - |
| Muesing, Lou | C | Newark Smiths | 25 | 04/25/1862 | Boston | USA | Right | Right | 5' 10" | 190 lbs | - |
| Mullaney, Marty | 2B | Troy Rivermen | 25 | 12/12/1861 | Cumberland | USA | Right | Right | 5' 11" | 175 lbs | - |
| Murphy, Mick | 1B | Allentown Peanuts | 31 | 06/08/1856 | Philadelphia | USA | Left | Left | 5' 11" | 160 lbs | - |
