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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Al Mallon | 1886-1886 | 0 | 1 | .000 | 9.00 | 2 | 0 | 0 | 0 | 0 | 3.0 | 6 | 3 | 1 | 3 | 1 |
| Elmer Manuel | 1879-1885 | 67 | 45 | .598 | 2.25 | 121 | 113 | 93 | 9 | 0 | 993.1 | 832 | 248 | 9 | 186 | 536 |
| Jim Marchand | 1885-1885 | 0 | 2 | .000 | 10.50 | 5 | 0 | 0 | 0 | 0 | 6.0 | 11 | 7 | 0 | 1 | 2 |
| John Martin | 1876-1888 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 1 |
| Fred Mathews | 1879-1888 | 9 | 15 | .375 | 2.23 | 56 | 26 | 3 | 0 | 2 | 233.2 | 248 | 58 | 1 | 18 | 50 |
| Willis McAdory | 1883-1885 | 4 | 8 | .333 | 3.74 | 70 | 0 | 0 | 0 | 4 | 108.1 | 152 | 45 | 0 | 39 | 36 |
| Kevin McCart | 1876-1881 | 4 | 3 | .571 | 1.53 | 21 | 8 | 7 | 1 | 0 | 94.1 | 101 | 16 | 1 | 2 | 15 |
| Al McDonough | 1887-1889 | 55 | 75 | .423 | 3.64 | 163 | 134 | 88 | 3 | 2 | 1138.1 | 1285 | 460 | 49 | 216 | 220 |
| Lou McElroy | 1888-1888 | 2 | 0 | 1.000 | 0.00 | 2 | 0 | 0 | 0 | 0 | 4.0 | 2 | 0 | 0 | 1 | 3 |
| Cyrus McKelvie | 1876-1884 | 0 | 0 | .000 | 2.70 | 2 | 0 | 0 | 0 | 0 | 3.1 | 1 | 1 | 0 | 3 | 3 |
| Walt McKinnon | 1883-1887 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 0 |
| Elmer McKinzy | 1885-1888 | 0 | 0 | .000 | 15.00 | 2 | 0 | 0 | 0 | 0 | 3.0 | 5 | 5 | 1 | 3 | 2 |
| Charley McLeod | 1890-1890 | 6 | 18 | .250 | 5.73 | 31 | 30 | 6 | 0 | 0 | 201.0 | 274 | 128 | 12 | 105 | 38 |
| Neil McNair | 1881-1881 | 0 | 2 | .000 | 24.55 | 5 | 0 | 0 | 0 | 0 | 7.1 | 21 | 20 | 1 | 11 | 0 |
| Alfred Means | 1883-1884 | 0 | 1 | .000 | 3.71 | 13 | 0 | 0 | 0 | 0 | 17.0 | 28 | 7 | 0 | 10 | 1 |
| Alfred Mercier | 1883-1889 | 9 | 16 | .360 | 4.83 | 30 | 27 | 11 | 0 | 0 | 208.2 | 265 | 112 | 14 | 60 | 31 |
| Walt Merritt | 1888-1889 | 26 | 25 | .510 | 3.28 | 94 | 54 | 32 | 2 | 5 | 511.0 | 536 | 186 | 13 | 109 | 223 |
| Ted Mielke | 1876-1877 | 1 | 1 | .500 | 1.65 | 9 | 0 | 0 | 0 | 1 | 16.1 | 17 | 3 | 0 | 6 | 1 |
| Leo Miller | 1876-1877 | 28 | 19 | .596 | 2.44 | 56 | 50 | 41 | 6 | 0 | 438.2 | 456 | 119 | 9 | 13 | 54 |
| Tommy Milligan | 1883-1886 | 3 | 6 | .333 | 8.89 | 85 | 0 | 0 | 0 | 3 | 130.2 | 217 | 129 | 11 | 105 | 33 |
| Herbert Monroe | 1886-1886 | 1 | 1 | .500 | 4.89 | 23 | 0 | 0 | 0 | 0 | 49.2 | 49 | 27 | 0 | 37 | 27 |
| Vic Montague | 1879-1883 | 1 | 0 | 1.000 | 3.65 | 52 | 0 | 0 | 0 | 0 | 128.1 | 173 | 52 | 0 | 33 | 44 |
| Henry Moody | 1882-1885 | 24 | 30 | .444 | 3.24 | 85 | 56 | 34 | 3 | 0 | 511.1 | 514 | 184 | 12 | 190 | 252 |
| Will Morrill | 1884-1885 | 30 | 39 | .435 | 3.30 | 77 | 77 | 44 | 0 | 0 | 625.1 | 612 | 229 | 21 | 200 | 290 |
| Jack Morris | 1884-1885 | 1 | 4 | .200 | 2.19 | 9 | 0 | 0 | 0 | 0 | 12.1 | 15 | 3 | 0 | 5 | 6 |
| Sam Morse | 1890-1890 | 4 | 22 | .154 | 4.43 | 44 | 29 | 5 | 0 | 2 | 205.1 | 264 | 101 | 6 | 82 | 70 |
| Maurice Mulcahy | 1890-1890 | 0 | 0 | .000 | 2.49 | 14 | 0 | 0 | 0 | 0 | 21.2 | 23 | 6 | 0 | 11 | 9 |
| Ed Murdock | 1886-1886 | 0 | 5 | .000 | 7.20 | 13 | 0 | 0 | 0 | 0 | 15.0 | 25 | 12 | 0 | 11 | 7 |
| Pat Murphy | 1876-1883 | 101 | 103 | .495 | 2.91 | 233 | 211 | 155 | 10 | 3 | 1742.1 | 1990 | 563 | 17 | 152 | 286 |
