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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jeff MacBride | 1895-1895 | 12 | 11 | .522 | 4.66 | 27 | 27 | 10 | 2 | 0 | 195.0 | 243 | 101 | 8 | 93 | 44 |
| Tim MacDermid | 1892-1897 | 24 | 22 | .522 | 3.90 | 132 | 18 | 9 | 1 | 23 | 332.0 | 382 | 144 | 12 | 137 | 98 |
| Bill Magee | 1897-1897 | 0 | 0 | .000 | 2.33 | 11 | 0 | 0 | 0 | 0 | 19.1 | 13 | 5 | 0 | 10 | 7 |
| Les Mahoney | 1894-1897 | 92 | 55 | .626 | 3.95 | 167 | 156 | 107 | 1 | 0 | 1298.1 | 1604 | 570 | 5 | 389 | 248 |
| Rigoberto Martínez | 1896-1896 | 2 | 9 | .182 | 6.53 | 21 | 9 | 1 | 0 | 0 | 73.0 | 101 | 53 | 2 | 75 | 23 |
| Ernie Mason | 1892-1893 | 12 | 23 | .343 | 6.72 | 54 | 43 | 15 | 0 | 0 | 290.2 | 357 | 217 | 23 | 213 | 77 |
| Gil Matte | 1892-1895 | 2 | 4 | .333 | 3.03 | 39 | 0 | 0 | 0 | 3 | 74.1 | 76 | 25 | 2 | 32 | 15 |
| Geoff McAfee | 1895-1897 | 8 | 7 | .533 | 3.71 | 62 | 6 | 4 | 0 | 1 | 165.0 | 207 | 68 | 1 | 46 | 30 |
| Brian McAlear | 1892-1894 | 9 | 11 | .450 | 4.07 | 48 | 20 | 10 | 0 | 1 | 218.2 | 226 | 99 | 14 | 105 | 65 |
| Greg McAlister | 1892-1897 | 118 | 101 | .539 | 3.31 | 282 | 241 | 157 | 11 | 0 | 2105.2 | 2235 | 774 | 55 | 654 | 688 |
| Jeffrey McCarthy | 1894-1897 | 68 | 47 | .591 | 3.95 | 137 | 124 | 80 | 1 | 0 | 1003.2 | 1166 | 441 | 17 | 388 | 239 |
| Chris McLain | 1892-1897 | 11 | 7 | .611 | 3.20 | 114 | 0 | 0 | 0 | 5 | 244.1 | 236 | 87 | 11 | 100 | 69 |
| Nick Merritt | 1892-1894 | 16 | 13 | .552 | 4.53 | 84 | 32 | 15 | 1 | 0 | 333.2 | 377 | 168 | 14 | 211 | 118 |
| Ray Miles | 1892-1895 | 68 | 62 | .523 | 3.49 | 148 | 141 | 95 | 7 | 0 | 1152.0 | 1190 | 447 | 64 | 429 | 317 |
| Jacques Mollet | 1892-1897 | 119 | 113 | .513 | 3.67 | 290 | 240 | 160 | 8 | 9 | 2067.2 | 2447 | 842 | 58 | 592 | 653 |
| Gérard Monteil | 1892-1897 | 16 | 16 | .500 | 3.20 | 91 | 0 | 0 | 0 | 15 | 123.2 | 135 | 44 | 5 | 46 | 37 |
| J.R. Moore | 1892-1896 | 96 | 88 | .522 | 3.62 | 206 | 200 | 130 | 5 | 0 | 1624.2 | 1865 | 654 | 48 | 591 | 420 |
| Tim Moores | 1892-1897 | 4 | 2 | .667 | 4.57 | 47 | 0 | 0 | 0 | 5 | 69.0 | 79 | 35 | 5 | 40 | 19 |
| Matthieu Moreau | 1892-1897 | 18 | 5 | .783 | 3.04 | 95 | 0 | 0 | 0 | 9 | 148.0 | 169 | 50 | 6 | 63 | 39 |
| Dimitri Moret | 1892-1892 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 1 | 2.0 | 1 | 0 | 0 | 1 | 2 |
| Tom Moriarty | 1894-1897 | 3 | 0 | 1.000 | 2.73 | 27 | 0 | 0 | 0 | 3 | 52.2 | 58 | 16 | 0 | 25 | 8 |
| Wayne Morley | 1896-1897 | 5 | 4 | .556 | 2.70 | 40 | 0 | 0 | 0 | 8 | 53.1 | 56 | 16 | 1 | 8 | 10 |
| Mike Morris | 1895-1897 | 5 | 1 | .833 | 3.40 | 26 | 0 | 0 | 0 | 1 | 39.2 | 48 | 15 | 0 | 14 | 7 |
| Bryan Mrazek | 1897-1897 | 1 | 4 | .200 | 6.08 | 8 | 5 | 2 | 0 | 0 | 37.0 | 37 | 25 | 1 | 26 | 12 |
| Marcial Muñoz | 1895-1895 | 0 | 0 | .000 | 2.19 | 6 | 0 | 0 | 0 | 1 | 12.1 | 12 | 3 | 0 | 12 | 3 |
