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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chuck Mann | 1884-1884 | 3 | 2 | .600 | 1.33 | 18 | 0 | 0 | 0 | 4 | 27.0 | 22 | 4 | 0 | 14 | 15 |
| Sam Mann | 1890-1890 | 0 | 1 | .000 | 18.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 1 | 2 | 0 | 3 | 1 |
| Alfred Marks | 1884-1890 | 67 | 74 | .475 | 3.67 | 149 | 145 | 106 | 5 | 0 | 1209.1 | 1183 | 493 | 40 | 265 | 377 |
| Al Marshall | 1885-1885 | 11 | 23 | .324 | 2.15 | 38 | 38 | 25 | 1 | 0 | 322.1 | 289 | 77 | 6 | 92 | 137 |
| Bob Martin | 1882-1884 | 7 | 17 | .292 | 5.15 | 40 | 26 | 8 | 0 | 1 | 194.0 | 265 | 111 | 12 | 78 | 27 |
| Frank McCabe | 1886-1889 | 81 | 85 | .488 | 3.05 | 174 | 167 | 128 | 5 | 0 | 1413.0 | 1387 | 479 | 26 | 381 | 714 |
| Hank McCann | 1889-1889 | 13 | 19 | .406 | 4.49 | 49 | 33 | 18 | 0 | 0 | 286.1 | 309 | 143 | 13 | 139 | 163 |
| Henry McCoy | 1889-1889 | 0 | 0 | .000 | 2.45 | 4 | 0 | 0 | 0 | 1 | 7.1 | 4 | 2 | 0 | 5 | 3 |
| Al McDonough | 1884-1886 | 43 | 29 | .597 | 2.41 | 100 | 73 | 58 | 7 | 1 | 668.1 | 624 | 179 | 10 | 118 | 399 |
| George McFadden | 1890-1890 | 0 | 1 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.2 | 2 | 0 | 0 | 3 | 0 |
| Gus McGuire | 1882-1883 | 31 | 22 | .585 | 2.37 | 57 | 57 | 36 | 4 | 0 | 449.0 | 422 | 118 | 11 | 103 | 303 |
| Dan McMahon | 1882-1885 | 1 | 4 | .200 | 4.09 | 49 | 0 | 0 | 0 | 1 | 66.0 | 80 | 30 | 5 | 27 | 12 |
| Elmer Meier | 1887-1889 | 61 | 43 | .587 | 2.63 | 125 | 104 | 87 | 6 | 2 | 920.0 | 798 | 269 | 32 | 277 | 401 |
| Roy Merriweather | 1886-1890 | 30 | 35 | .462 | 3.54 | 88 | 67 | 42 | 4 | 0 | 589.1 | 592 | 232 | 19 | 280 | 192 |
| Tommy Milligan | 1887-1888 | 1 | 0 | 1.000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 0 | 0 | 0 | 0 | 0 |
| John Mills | 1889-1889 | 0 | 1 | .000 | 3.97 | 8 | 0 | 0 | 0 | 0 | 11.1 | 11 | 5 | 1 | 14 | 6 |
| Will Milner | 1890-1890 | 16 | 16 | .500 | 4.11 | 37 | 35 | 21 | 0 | 0 | 284.2 | 295 | 130 | 3 | 133 | 131 |
| Herbert Monroe | 1884-1884 | 0 | 0 | .000 | 2.01 | 26 | 0 | 0 | 0 | 1 | 58.1 | 47 | 13 | 0 | 27 | 19 |
| Vic Montague | 1884-1885 | 8 | 20 | .286 | 4.34 | 41 | 31 | 13 | 0 | 0 | 253.0 | 328 | 122 | 13 | 46 | 70 |
| Henry Moody | 1887-1887 | 8 | 16 | .333 | 4.56 | 44 | 28 | 14 | 0 | 0 | 244.2 | 301 | 124 | 10 | 71 | 35 |
| Joe Morris | 1883-1884 | 0 | 0 | .000 | 15.43 | 2 | 0 | 0 | 0 | 0 | 2.1 | 7 | 4 | 1 | 3 | 1 |
| A.W. Morton | 1884-1885 | 0 | 0 | .000 | 2.55 | 40 | 0 | 0 | 0 | 1 | 113.0 | 121 | 32 | 0 | 18 | 54 |
| Daniel Mosby | 1889-1889 | 1 | 2 | .333 | 6.94 | 23 | 0 | 0 | 0 | 0 | 48.0 | 70 | 37 | 5 | 31 | 9 |
| George Mulligan | 1883-1889 | 40 | 51 | .440 | 3.09 | 127 | 90 | 74 | 4 | 3 | 852.1 | 863 | 293 | 15 | 219 | 293 |
