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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
|---|---|---|---|---|---|---|---|---|---|
| Dick Mace | 1886-1886 | .235 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Tom Maddox | 1884-1899 | .238 | 32 | 452 | 0 | 0 | 0 | 0.00 | 0 |
| Frank Maher | 1891-1899 | .296 | 31 | 526 | 0 | 0 | 0 | 0.00 | 0 |
| Al Mallon | 1889-1899 | .256 | 64 | 540 | 0 | 0 | 0 | 0.00 | 0 |
| Stephen Mancini | 1892-1893 | 1.000 | 0 | 0 | 0 | 0 | 0 | 9.69 | 4 |
| Chuck Mann | 1886-1887 | .125 | 0 | 0 | 0 | 2 | 0 | 6.38 | 9 |
| Sam Mann | 1892-1894 | .000 | 0 | 0 | 4 | 3 | 6 | 2.28 | 10 |
| Will Manning | 1896-1899 | .296 | 4 | 194 | 0 | 0 | 0 | 0.00 | 0 |
| Chester March | 1884-1896 | .261 | 92 | 619 | 0 | 0 | 0 | 36.00 | 4 |
| Jim Marchand | 1886-1890 | .284 | 4 | 73 | 94 | 72 | 5 | 3.23 | 1288 |
| Al Marshall | 1886-1891 | .273 | 31 | 101 | 90 | 81 | 4 | 4.18 | 1161 |
| Henry Martin | 1884-1887 | .251 | 9 | 170 | 0 | 0 | 0 | 0.00 | 0 |
| Nate Maston | 1884-1888 | .284 | 1 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Albert Mathews | 1892-1899 | .236 | 0 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Fred Mathews | 1886-1886 | .296 | 0 | 37 | 3 | 29 | 0 | 10.39 | 39 |
| Harlan Matthews | 1897-1899 | .297 | 7 | 204 | 51 | 52 | 0 | 4.94 | 286 |
| John Mayfield | 1892-1894 | .310 | 17 | 181 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Maynard | 1892-1899 | .196 | 1 | 13 | 15 | 22 | 1 | 5.53 | 44 |
| Ira McCann | 1898-1899 | .293 | 1 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Jimmy McCaskey | 1885-1885 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Denny McClister | 1891-1892 | .238 | 6 | 48 | 53 | 27 | 0 | 4.05 | 471 |
| Tom McCord | 1889-1890 | .170 | 2 | 8 | 11 | 15 | 4 | 7.78 | 86 |
| Hugh McCray | 1892-1895 | .284 | 13 | 241 | 0 | 0 | 0 | 0.00 | 0 |
| Bob McDougall | 1884-1887 | .211 | 1 | 6 | 20 | 12 | 21 | 3.99 | 251 |
| David McDuffie | 1886-1887 | .291 | 31 | 192 | 0 | 0 | 0 | 0.00 | 0 |
| Daniel McFarlin | 1887-1887 | .043 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Tim McGowan | 1892-1893 | .307 | 6 | 102 | 0 | 0 | 0 | 0.00 | 0 |
| Glenn McKellar | 1892-1897 | .272 | 0 | 8 | 9 | 10 | 0 | 6.40 | 60 |
| Neil McNair | 1892-1896 | .291 | 3 | 97 | 0 | 0 | 0 | 0.00 | 0 |
| Kenneth Meier | 1892-1899 | .233 | 7 | 73 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Walt Mercer | 1888-1891 | .181 | 4 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Simon Merrill | 1885-1888 | .295 | 10 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Meyer | 1896-1897 | .042 | 0 | 1 | 0 | 1 | 0 | 2.02 | 7 |
| Jack Miller | 1886-1886 | .325 | 3 | 65 | 0 | 0 | 0 | 0.00 | 0 |
| Ben Milon | 1884-1886 | .246 | 7 | 79 | 0 | 0 | 0 | 0.00 | 0 |
| Jasper Milson | 1891-1899 | .329 | 33 | 619 | 0 | 0 | 0 | 0.00 | 0 |
| David Molloy | 1888-1889 | .216 | 3 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Edgar Monroe | 1886-1886 | .452 | 11 | 108 | 0 | 0 | 0 | 0.00 | 0 |
| Herbert Monroe | 1887-1894 | .121 | 5 | 20 | 28 | 46 | 25 | 5.65 | 639 |
| Vic Montague | 1888-1888 | .200 | 0 | 1 | 1 | 3 | 0 | 5.56 | 5 |
| Charles Moore | 1887-1887 | .155 | 2 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Ed Moriarty | 1894-1899 | .259 | 4 | 145 | 120 | 113 | 0 | 4.43 | 503 |
| Jack Morris | 1886-1888 | .000 | 0 | 0 | 1 | 0 | 0 | 5.71 | 23 |
| Ned Morris | 1884-1884 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Levi Mueller | 1892-1892 | .413 | 13 | 84 | 0 | 0 | 0 | 0.00 | 0 |
| Ambrose Mullins | 1887-1887 | .217 | 5 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Andy Murtagh | 1896-1899 | .242 | 4 | 54 | 42 | 37 | 7 | 4.18 | 208 |
| Al Myers | 1886-1886 | .310 | 5 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Al Myrick | 1886-1886 | .259 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
