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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jim Maier | 1901-1907 | 29 | 47 | .382 | 4.11 | 189 | 63 | 36 | 1 | 16 | 717.2 | 807 | 328 | 18 | 238 | 244 |
| Harry Mairs | 1901-1907 | 91 | 130 | .412 | 3.96 | 263 | 239 | 154 | 9 | 1 | 2028.1 | 2213 | 893 | 35 | 533 | 664 |
| Stephen Mancini | 1892-1893 | 0 | 0 | .000 | 9.69 | 4 | 1 | 0 | 0 | 0 | 13.0 | 20 | 14 | 0 | 15 | 4 |
| Chuck Mann | 1886-1887 | 0 | 2 | .000 | 6.38 | 5 | 3 | 1 | 0 | 0 | 24.0 | 37 | 17 | 1 | 14 | 9 |
| Sam Mann | 1892-1894 | 4 | 3 | .571 | 2.28 | 33 | 0 | 0 | 0 | 6 | 47.1 | 41 | 12 | 2 | 26 | 10 |
| Chester March | 1884-1896 | 0 | 0 | .000 | 36.00 | 4 | 0 | 0 | 0 | 0 | 3.0 | 5 | 12 | 3 | 19 | 4 |
| Jim Marchand | 1886-1890 | 94 | 72 | .566 | 3.23 | 242 | 215 | 46 | 13 | 5 | 1566.2 | 1335 | 563 | 38 | 585 | 1288 |
| Otis Markham | 1907-1907 | 8 | 6 | .571 | 2.74 | 20 | 14 | 11 | 2 | 2 | 121.1 | 107 | 37 | 0 | 27 | 50 |
| Al Marshall | 1886-1891 | 90 | 81 | .526 | 4.18 | 263 | 225 | 38 | 3 | 4 | 1571.0 | 1478 | 729 | 52 | 762 | 1161 |
| Fred Mathews | 1886-1886 | 3 | 29 | .094 | 10.39 | 39 | 39 | 0 | 0 | 0 | 175.0 | 309 | 202 | 3 | 135 | 39 |
| Harlan Matthews | 1897-1900 | 62 | 78 | .443 | 5.34 | 171 | 170 | 41 | 7 | 0 | 1226.2 | 1401 | 728 | 29 | 653 | 368 |
| Bill Maynard | 1892-1899 | 15 | 22 | .405 | 5.53 | 73 | 38 | 8 | 1 | 1 | 337.0 | 399 | 207 | 18 | 155 | 44 |
| Denny McClister | 1891-1892 | 53 | 27 | .662 | 4.05 | 83 | 81 | 67 | 4 | 0 | 698.0 | 651 | 314 | 57 | 343 | 471 |
| Tom McCord | 1889-1890 | 11 | 15 | .423 | 7.78 | 76 | 31 | 0 | 0 | 4 | 209.1 | 246 | 181 | 15 | 226 | 86 |
| Bob McDougall | 1884-1887 | 20 | 12 | .625 | 3.99 | 183 | 0 | 0 | 0 | 21 | 236.2 | 184 | 105 | 28 | 118 | 251 |
| Chink McIntyre | 1901-1907 | 32 | 33 | .492 | 4.75 | 133 | 62 | 20 | 2 | 14 | 565.0 | 639 | 298 | 27 | 192 | 208 |
| Glenn McKellar | 1892-1897 | 9 | 10 | .474 | 6.40 | 57 | 29 | 10 | 0 | 0 | 254.1 | 292 | 181 | 10 | 223 | 60 |
| Dave Meyer | 1896-1897 | 0 | 1 | .000 | 2.02 | 20 | 0 | 0 | 0 | 0 | 35.2 | 24 | 8 | 1 | 13 | 7 |
| Will Milner | 1900-1900 | 20 | 17 | .541 | 4.41 | 47 | 47 | 25 | 5 | 0 | 381.2 | 409 | 187 | 3 | 156 | 73 |
| Herbert Monroe | 1887-1894 | 28 | 46 | .378 | 5.65 | 207 | 48 | 30 | 0 | 25 | 707.1 | 734 | 444 | 113 | 417 | 639 |
| Vic Montague | 1888-1888 | 1 | 3 | .250 | 5.56 | 10 | 2 | 0 | 0 | 0 | 22.2 | 29 | 14 | 3 | 7 | 5 |
| Harry Moore | 1901-1907 | 90 | 124 | .421 | 4.14 | 249 | 219 | 157 | 15 | 1 | 1920.2 | 2107 | 884 | 40 | 678 | 691 |
| Ed Moriarty | 1894-1900 | 142 | 132 | .518 | 4.45 | 304 | 296 | 180 | 19 | 0 | 2483.2 | 2761 | 1228 | 45 | 901 | 606 |
| Jack Morris | 1886-1888 | 1 | 0 | 1.000 | 5.71 | 10 | 1 | 0 | 0 | 0 | 17.1 | 20 | 11 | 4 | 11 | 23 |
| Con Murray | 1907-1907 | 8 | 5 | .615 | 3.40 | 65 | 6 | 1 | 1 | 16 | 132.1 | 118 | 50 | 3 | 37 | 42 |
| Andy Murtagh | 1896-1900 | 42 | 37 | .532 | 4.18 | 110 | 81 | 60 | 6 | 7 | 712.0 | 747 | 331 | 17 | 273 | 208 |
