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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 |
|---|---|---|---|---|---|---|---|---|---|
| Dan Madden | 1886-1890 | .316 | 18 | 131 | 0 | 0 | 0 | 0.00 | 0 |
| Nate Mahoney | 1884-1890 | .174 | 0 | 62 | 120 | 149 | 5 | 3.84 | 821 |
| Rick Malsom | 1886-1887 | .236 | 0 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Oliver Marbury | 1884-1890 | .307 | 45 | 431 | 0 | 0 | 0 | 0.00 | 0 |
| Abraham Martin | 1888-1888 | .192 | 3 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Henry Martin | 1888-1888 | .500 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Willis McAdory | 1886-1888 | .153 | 0 | 24 | 74 | 61 | 0 | 3.32 | 285 |
| Clarence McCarthy | 1886-1886 | .222 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Jimmy McCaskey | 1886-1887 | .125 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Tom McCord | 1886-1888 | .000 | 0 | 0 | 1 | 0 | 0 | 5.40 | 5 |
| Augie McDonald | 1884-1885 | .245 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Bob McDougall | 1888-1890 | .000 | 0 | 0 | 1 | 1 | 5 | 0.78 | 23 |
| David McDuffie | 1888-1890 | .242 | 8 | 147 | 0 | 0 | 0 | 0.00 | 0 |
| Walt McGee | 1887-1887 | .234 | 4 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Gus McGuire | 1884-1890 | .270 | 1 | 72 | 151 | 152 | 0 | 3.26 | 1032 |
| Ray McIntyre | 1888-1890 | .198 | 3 | 93 | 0 | 0 | 0 | 0.00 | 0 |
| Joe McKenzie | 1886-1886 | .318 | 0 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Walt McKinnon | 1889-1890 | .305 | 5 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| John McLaurin | 1884-1887 | .328 | 20 | 273 | 0 | 0 | 0 | 0.00 | 0 |
| Dan McMahon | 1886-1887 | .286 | 0 | 1 | 1 | 2 | 0 | 9.15 | 5 |
| Ben McPhail | 1886-1890 | .248 | 21 | 276 | 0 | 0 | 0 | 0.00 | 0 |
| Lester McPherson | 1884-1886 | .140 | 0 | 8 | 11 | 31 | 0 | 5.41 | 41 |
| Alfred Means | 1886-1888 | .067 | 0 | 1 | 5 | 1 | 0 | 6.15 | 18 |
| Chuck Medlin | 1884-1885 | .190 | 0 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Fred Merriam | 1884-1890 | .286 | 8 | 216 | 0 | 0 | 0 | 0.00 | 0 |
| Theo Meyer | 1886-1890 | .192 | 7 | 93 | 0 | 0 | 0 | 0.00 | 0 |
| Tommy Millen | 1884-1886 | .191 | 0 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Donny Monaghan | 1884-1884 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ed Monahan | 1884-1886 | .345 | 11 | 169 | 0 | 0 | 0 | 0.00 | 0 |
| Tim Monroe | 1884-1885 | .333 | 1 | 4 | 0 | 1 | 0 | 5.40 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Vic Montague | 1886-1890 | .145 | 1 | 26 | 53 | 50 | 1 | 3.53 | 319 |
| Henry Moody | 1884-1886 | .173 | 0 | 19 | 30 | 30 | 0 | 3.59 | 127 |
| Al Moore | 1888-1888 | .367 | 1 | 78 | 0 | 0 | 0 | 0.00 | 0 |
| Tom Moran | 1888-1890 | .242 | 6 | 156 | 0 | 0 | 0 | 0.00 | 0 |
| Dan Moriarty | 1884-1884 | .277 | 0 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Will Morrill | 1886-1890 | .164 | 1 | 45 | 106 | 108 | 4 | 3.65 | 558 |
| Jack Morris | 1886-1890 | .000 | 0 | 0 | 3 | 2 | 0 | 2.57 | 11 |
| A.W. Morton | 1887-1887 | .364 | 0 | 3 | 3 | 0 | 0 | 5.95 | 11 |
| Fred Moulton | 1884-1890 | .318 | 12 | 224 | 0 | 0 | 0 | 0.00 | 0 |
| George Mulligan | 1884-1887 | .162 | 0 | 39 | 102 | 56 | 1 | 3.09 | 629 |
| Ambrose Mullins | 1886-1886 | .333 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Ed Murdock | 1888-1890 | .146 | 1 | 16 | 47 | 55 | 2 | 3.12 | 371 |
| Pat Murphy | 1884-1890 | .267 | 2 | 101 | 145 | 114 | 0 | 3.14 | 571 |
