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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Mack, Connie | C | Washington Nationals | 25 | 12/22/1862 | East Brookfield | USA | Right | Right | 185 cm | 68 kg | P240 |
| Mack, Denny | SS | St. Louis Browns | 37 | 05/05/1851 | Easton | USA | Right | Right | 170 cm | 78 kg | P270 |
| Madden, Kid | RP | Pittsburgh Alleghenys | 20 | 10/02/1867 | Portland | USA | Left | Left | 170 cm | 58 kg | P380 |
| Madigan, Tony | RP | Boston Beaneaters | 20 | 07/18/1868 | Washington | USA | Right | Right | 165 cm | 58 kg | P376 |
| Mains, Willard | RP | Free Agent | 20 | 07/07/1868 | North Windham | USA | Right | Right | 188 cm | 86 kg | - |
| Malone, Martin | RP | Chicago White Stockings | 38 | 05/05/1850 | Unknown | USA | Right | Right | 178 cm | 77 kg | P398 |
| Mann, Fred | RF | Washington Nationals | 30 | 04/01/1858 | Sutton | USA | Left | Right | 178 cm | 84 kg | P347 |
| Manning, Jack | 1B | Free Agent | 33 | 12/20/1854 | Braintree | USA | Right | Right | 173 cm | 80 kg | - |
| Manning, Jim H | 2B | Boston Beaneaters | 26 | 01/31/1862 | Fall River | USA | Switch | Right | 170 cm | 73 kg | P250 |
| Mansell, John | CF | St. Louis Browns | 29 | 05/05/1859 | Auburn | USA | Left | Right | 178 cm | 80 kg | P250 |
| Mansell, Mike | LF | Philadelphia Quakers | 31 | 01/15/1857 | Auburn | USA | Left | Right | 180 cm | 86 kg | P260 |
| Mansell, Tom | LF | Free Agent | 34 | 01/01/1854 | Auburn | USA | Left | Right | 173 cm | 76 kg | - |
| Mappes, George | 2B | Baltimore Orioles | 22 | 12/25/1865 | St. Louis | USA | Right | Right | 173 cm | 91 kg | - |
| Marr, Lefty | RF | Cincinnati Red Stockings | 25 | 09/19/1862 | Cincinnati | USA | Left | Left | 175 cm | 82 kg | P210 |
| Maskrey, Leech | LF | Free Agent | 34 | 02/11/1854 | Mercer | USA | Right | Right | 173 cm | 67 kg | - |
| Mathews, Bobby | SP | Cleveland Blues | 36 | 11/21/1851 | Baltimore | USA | Right | Right | 165 cm | 63 kg | P340 |
| Matteson, C V | RP | Kansas City Cowboys | 26 | 11/24/1861 | Seville | USA | Right | Right | 178 cm | 79 kg | P418 |
| Matthias, Steve | SS | Baltimore Orioles | 28 | 05/05/1860 | Mitchellville | USA | Right | Right | 173 cm | 74 kg | P240 |
| Mattimore, Mike | RP | New York Giants | 30 | 08/05/1858 | North Bend | USA | Left | Left | 173 cm | 73 kg | P260 |
| Maul, Al | 1B | Louisville Colonels | 22 | 10/09/1865 | Philadelphia | USA | Right | Right | 183 cm | 80 kg | P230 |
| Mays, Al | RP | Louisville Colonels | 23 | 05/17/1865 | Unknown | USA | Right | Right | 178 cm | 78 kg | P230 |
| McCaffery, Harry | 2B | Washington Nationals | 29 | 11/25/1858 | St. Louis | USA | Right | Right | 178 cm | 83 kg | P260 |
| McCaffrey, William | RP | Baltimore Orioles | 25 | 05/05/1863 | Baltimore | USA | Right | Right | 178 cm | 78 kg | P390 |
| McCarthy, Tommy | RF | Cincinnati Red Stockings | 25 | 07/24/1863 | Boston | USA | Right | Right | 170 cm | 78 kg | P240 |
| McCarton, Frank | RF | Free Agent | 33 | 10/06/1854 | New York | USA | Right | Right | 178 cm | 82 kg | - |
| McCauley, Al | RP | Kansas City Cowboys | 25 | 03/04/1863 | Indianapolis | USA | Left | Left | 183 cm | 83 kg | P336 |
| McCauley, Josiah | 2B | Kansas City Cowboys | 23 | 06/24/1865 | Levittown | USA | Right | Right | 168 cm | 71 kg | P210 |
| McClure, Hal | RF | St. Louis Browns | 29 | 08/08/1859 | Lewisburg | USA | Right | Right | 183 cm | 77 kg | P260 |
| McCormick, Harry | CL | Indianapolis Hoosiers | 33 | 10/25/1854 | Syracuse | USA | Right | Right | 175 cm | 74 kg | P520 |
| McCormick, Jerry | 3B | Baltimore Orioles | 26 | 12/31/1861 | Philadelphia | USA | Right | Right | 180 cm | 82 kg | P240 |
| McDonald, Jim A | CF | Philadelphia Quakers | 28 | 08/06/1860 | San Francisco | USA | Right | Right | 175 cm | 83 kg | P250 |
| McElroy, Jim | RP | Brooklyn Bridegrooms | 25 | 11/05/1862 | Unknown | USA | Right | Right | 178 cm | 80 kg | - |
| McGarr, Chippy | 3B | Washington Nationals | 25 | 05/10/1863 | Worcester | USA | Right | Right | 170 cm | 78 kg | P494 |
| McGeachey, Jack | RF | Detroit Wolverines | 24 | 05/13/1864 | Clinton | USA | Right | Right | 173 cm | 75 kg | P250 |
| McGlone, John | 3B | Washington Nationals | 24 | 05/05/1864 | Brooklyn | USA | Right | Right | 178 cm | 75 kg | P240 |
| McGuire, Deacon | C | Chicago White Stockings | 24 | 11/18/1863 | Youngstown | USA | Right | Right | 185 cm | 84 kg | P240 |
| McKean, Ed | LF | Cleveland Blues | 24 | 06/06/1864 | Grafton | USA | Right | Right | 175 cm | 73 kg | P430 |
| McKeon, Larry | SP | Cincinnati Red Stockings | 22 | 03/25/1866 | New York | USA | Right | Right | 178 cm | 75 kg | P360 |
| McKinnon, Alex | 1B | New York Giants | 32 | 08/14/1856 | Boston | USA | Right | Right | 180 cm | 79 kg | P260 |
| McLaughlin, Frank | 2B | Free Agent | 32 | 06/19/1856 | Lowell | USA | Right | Right | 175 cm | 73 kg | - |
| McLaughlin, Tom | SS | Louisville Colonels | 28 | 03/28/1860 | Louisville | USA | Right | Right | 178 cm | 80 kg | P230 |
| McPhee, Bid | 2B | Boston Beaneaters | 28 | 11/01/1859 | Massena | USA | Right | Right | 173 cm | 72 kg | P407 |
| McQuery, Mox | 1B | Louisville Colonels | 27 | 06/28/1861 | Unknown | USA | Right | Right | 185 cm | 90 kg | P240 |
| McShannic, Pete | 3B | Pittsburgh Alleghenys | 24 | 03/20/1864 | Pittsburgh | USA | Switch | Right | 170 cm | 87 kg | - |
| McTamany, Jim | CF | Brooklyn Bridegrooms | 25 | 07/01/1863 | Philadelphia | USA | Right | Right | 173 cm | 87 kg | P470 |
| Meegan, Pete | SP | New York Giants | 25 | 11/13/1862 | San Francisco | USA | Right | Right | 178 cm | 74 kg | P260 |
| Meinke, Frank | SP | Detroit Wolverines | 24 | 10/18/1863 | Chicago | USA | Right | Right | 178 cm | 78 kg | P380 |
| Meister, John | 2B | Indianapolis Hoosiers | 25 | 05/10/1863 | Allentown | USA | Right | Right | 173 cm | 79 kg | P240 |
| Mendoza, Mauricio | SS | New York Giants | 28 | 10/25/1859 | Austin | USA | Right | Right | 171 cm | 75 kg | P418 |
| Merrill, Ed | 2B | Baltimore Orioles | 28 | 05/22/1860 | Maysville | USA | Right | Right | 180 cm | 83 kg | P240 |
| Miller, Cyclone | SP | Baltimore Orioles | 28 | 09/24/1859 | Springfield | USA | Right | Left | 175 cm | 76 kg | P270 |
| Miller, Doggie | CF | Pittsburgh Alleghenys | 24 | 08/15/1864 | Brooklyn | USA | Right | Right | 168 cm | 67 kg | P378 |
| Miller, Joe A | SS | Indianapolis Hoosiers | 27 | 02/17/1861 | Baltimore | USA | Right | Right | 175 cm | 78 kg | P260 |
| Milligan, Jocko | C | Philadelphia Athletics | 27 | 08/08/1861 | Philadelphia | USA | Right | Right | 183 cm | 97 kg | P541 |
| Mitchell, Bobby M | RP | Baltimore Orioles | 32 | 02/06/1856 | Cincinnati | USA | Left | Left | 165 cm | 64 kg | P406 |
| Moe, Jeff | 2B | Pittsburgh Alleghenys | 25 | 11/03/1862 | Alvin | USA | Right | Right | 178 cm | 83 kg | P260 |
| Moffet, Sam | RP | Pittsburgh Alleghenys | 31 | 03/14/1857 | Wheeling | USA | Right | Right | 183 cm | 81 kg | P388 |
| Moore, Henry | 1B | Indianapolis Hoosiers | 26 | 05/05/1862 | Unknown | USA | Right | Right | 178 cm | 81 kg | P270 |
| Moore, Molly | 1B | Free Agent | 34 | 05/05/1854 | Unknown | USA | Right | Right | 178 cm | 82 kg | - |
| Morgan, Bill | C | Free Agent | 32 | 05/05/1856 | Brooklyn | USA | Right | Right | 178 cm | 77 kg | - |
| Morrill, John | SS | Kansas City Cowboys | 33 | 02/19/1855 | Boston | USA | Right | Right | 178 cm | 68 kg | P270 |
| Morris, Ed | SP | Washington Nationals | 25 | 09/29/1862 | Brooklyn | USA | Switch | Left | 170 cm | 77 kg | P418 |
| Morrison, Hank | RP | Kansas City Cowboys | 22 | 05/22/1866 | Unknown | USA | Right | Right | 178 cm | 81 kg | P210 |
| Morrison, Mike | SP | Cleveland Blues | 21 | 02/06/1867 | Erie | USA | Right | Right | 173 cm | 71 kg | P210 |
| Morton, Charlie H | LF | Kansas City Cowboys | 33 | 10/12/1854 | Kingsville | USA | Right | Right | 178 cm | 70 kg | P260 |
| Morton, Sparrow | RP | Cleveland Blues | 26 | 05/05/1862 | Unknown | USA | Right | Left | 178 cm | 78 kg | P374 |
| Moss, Nick | CF | Chicago White Stockings | 24 | 05/30/1864 | St. Johnsbury | USA | Right | Right | 173 cm | 76 kg | P210 |
| Mountain, Frank | CL | Cincinnati Red Stockings | 29 | 05/17/1859 | Unknown | USA | Right | Right | 180 cm | 81 kg | P510 |
| Moynahan, Mike | 3B | Brooklyn Bridegrooms | 33 | 05/05/1855 | Chicago | USA | Left | Right | 175 cm | 78 kg | P260 |
| Mulvey, Joe | 1B | Kansas City Cowboys | 29 | 10/27/1858 | Providence | USA | Right | Right | 180 cm | 79 kg | P240 |
| Munyan, John | RF | Cleveland Blues | 27 | 11/14/1860 | Chester | USA | Right | Right | 178 cm | 79 kg | - |
| Murphy, Joe | RP | Indianapolis Hoosiers | 21 | 09/07/1866 | St. Louis | USA | Right | Right | 180 cm | 73 kg | P220 |
| Murphy, John H | SP | Louisville Colonels | 30 | 05/05/1858 | Philadelphia | USA | Right | Right | 180 cm | 75 kg | P326 |
| Murphy, Pat | C | Cleveland Blues | 31 | 01/02/1857 | Auburn | USA | Right | Right | 178 cm | 72 kg | - |
| Murphy, Steve | LF | Brooklyn Bridegrooms | 20 | 06/22/1868 | Eagle Pass | USA | Right | Right | 175 cm | 80 kg | - |
| Murphy, Willie | LF | Cleveland Blues | 24 | 03/23/1864 | Springfield | USA | Left | Right | 180 cm | 91 kg | P250 |
| Myers, Al | 1B | Philadelphia Athletics | 24 | 10/22/1863 | Danville | USA | Right | Right | 173 cm | 73 kg | P260 |
| Myers, George | RF | Brooklyn Bridegrooms | 27 | 11/13/1860 | Buffalo | USA | Right | Right | 173 cm | 77 kg | P260 |
| Myers, Henry | RP | New York Giants | 31 | 05/05/1857 | Philadelphia | USA | Right | Right | 175 cm | 74 kg | P408 |
