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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nate Mahoney | 1884-1898 | 201 | 237 | .459 | 3.76 | 558 | 444 | 307 | 18 | 26 | 3892.1 | 4545 | 1628 | 114 | 981 | 1249 |
| Albert Maniccia | 1892-1892 | 2 | 1 | .667 | 6.09 | 5 | 5 | 2 | 0 | 0 | 34.0 | 42 | 23 | 5 | 35 | 11 |
| Willie Marcus | 1897-1899 | 1 | 1 | .500 | 5.48 | 15 | 3 | 1 | 0 | 1 | 42.2 | 60 | 26 | 1 | 18 | 9 |
| Frederick Markle | 1892-1899 | 1 | 0 | 1.000 | 2.54 | 21 | 0 | 0 | 0 | 1 | 46.0 | 44 | 13 | 2 | 21 | 9 |
| Jack Martino | 1899-1899 | 9 | 5 | .643 | 3.05 | 28 | 11 | 7 | 0 | 1 | 112.0 | 121 | 38 | 2 | 43 | 23 |
| Robin Maxwell | 1892-1894 | 0 | 4 | .000 | 5.10 | 13 | 1 | 1 | 0 | 1 | 30.0 | 45 | 17 | 2 | 16 | 7 |
| Willis McAdory | 1886-1888 | 74 | 61 | .548 | 3.32 | 140 | 140 | 106 | 14 | 0 | 1179.0 | 1289 | 435 | 27 | 231 | 285 |
| Denny McClister | 1895-1899 | 18 | 29 | .383 | 5.07 | 53 | 48 | 29 | 2 | 0 | 401.0 | 475 | 226 | 21 | 235 | 120 |
| Tom McCord | 1886-1888 | 1 | 0 | 1.000 | 5.40 | 7 | 0 | 0 | 0 | 0 | 10.0 | 10 | 6 | 0 | 12 | 5 |
| Jim McCormick | 1892-1892 | 2 | 2 | .500 | 4.28 | 4 | 4 | 3 | 0 | 0 | 33.2 | 48 | 16 | 0 | 16 | 5 |
| Al McDonough | 1891-1897 | 29 | 28 | .509 | 3.42 | 149 | 47 | 33 | 3 | 16 | 533.2 | 586 | 203 | 20 | 133 | 125 |
| Bob McDougall | 1888-1893 | 2 | 2 | .500 | 2.21 | 35 | 1 | 0 | 0 | 5 | 57.0 | 49 | 14 | 2 | 22 | 28 |
| Bill McGuire | 1896-1899 | 0 | 6 | .000 | 8.72 | 13 | 5 | 1 | 0 | 0 | 42.1 | 64 | 41 | 0 | 30 | 9 |
| Gus McGuire | 1884-1894 | 167 | 154 | .520 | 3.22 | 398 | 322 | 242 | 26 | 9 | 2861.0 | 3078 | 1023 | 58 | 471 | 1053 |
| Bill McKenrick | 1895-1899 | 0 | 0 | .000 | 3.23 | 16 | 0 | 0 | 0 | 0 | 30.2 | 31 | 11 | 1 | 10 | 8 |
| Carl McMahon | 1897-1899 | 7 | 15 | .318 | 3.12 | 25 | 24 | 18 | 1 | 0 | 208.0 | 216 | 72 | 3 | 98 | 79 |
| Dan McMahon | 1886-1887 | 1 | 2 | .333 | 9.15 | 29 | 0 | 0 | 0 | 0 | 41.1 | 55 | 42 | 1 | 32 | 5 |
| Lester McPherson | 1884-1886 | 11 | 31 | .262 | 5.41 | 60 | 59 | 3 | 1 | 0 | 366.0 | 514 | 220 | 4 | 98 | 41 |
| Alfred Means | 1886-1891 | 5 | 1 | .833 | 5.94 | 51 | 0 | 0 | 0 | 0 | 80.1 | 105 | 53 | 4 | 44 | 18 |
| Lem Meehan | 1896-1896 | 0 | 0 | .000 | 7.36 | 3 | 0 | 0 | 0 | 0 | 7.1 | 10 | 6 | 1 | 9 | 2 |
| Tim Monroe | 1884-1885 | 0 | 1 | .000 | 5.40 | 1 | 0 | 0 | 0 | 0 | 1.2 | 2 | 1 | 0 | 1 | 0 |
| Vic Montague | 1886-1896 | 146 | 140 | .510 | 3.65 | 363 | 301 | 203 | 24 | 6 | 2637.1 | 2919 | 1071 | 91 | 637 | 793 |
| Henry Moody | 1884-1886 | 30 | 30 | .500 | 3.59 | 63 | 63 | 46 | 8 | 0 | 518.2 | 514 | 207 | 9 | 150 | 127 |
| Charles Moran | 1892-1899 | 0 | 0 | .000 | 3.00 | 6 | 1 | 0 | 0 | 1 | 21.0 | 26 | 7 | 1 | 11 | 9 |
| Stephen Morell | 1892-1894 | 1 | 1 | .500 | 4.56 | 16 | 0 | 0 | 0 | 1 | 23.2 | 21 | 12 | 3 | 14 | 9 |
| Will Morrill | 1886-1899 | 232 | 225 | .508 | 3.71 | 536 | 482 | 337 | 30 | 9 | 4113.1 | 4413 | 1694 | 123 | 1480 | 1253 |
| Jack Morris | 1886-1890 | 3 | 2 | .600 | 2.57 | 15 | 0 | 0 | 0 | 0 | 21.0 | 14 | 6 | 0 | 14 | 11 |
| A.W. Morton | 1887-1887 | 3 | 0 | 1.000 | 5.95 | 14 | 0 | 0 | 0 | 0 | 39.1 | 53 | 26 | 2 | 26 | 11 |
| George Mulligan | 1884-1887 | 102 | 56 | .646 | 3.09 | 174 | 171 | 135 | 19 | 1 | 1494.0 | 1521 | 513 | 18 | 326 | 629 |
| Frank Mulrooney | 1896-1899 | 64 | 94 | .405 | 3.65 | 173 | 166 | 119 | 16 | 1 | 1400.0 | 1551 | 568 | 42 | 507 | 289 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| Ed Murdock | 1888-1898 | 163 | 155 | .513 | 3.55 | 401 | 323 | 227 | 21 | 14 | 2844.0 | 2788 | 1121 | 69 | 1361 | 1191 |
| Frank Murphy | 1896-1899 | 2 | 2 | .500 | 2.56 | 31 | 1 | 1 | 0 | 5 | 56.1 | 51 | 16 | 1 | 25 | 13 |
| Pat Murphy | 1884-1892 | 145 | 116 | .556 | 3.17 | 303 | 272 | 220 | 21 | 2 | 2450.2 | 2705 | 862 | 54 | 266 | 577 |
| Bill Murtagh | 1895-1897 | 3 | 2 | .600 | 2.16 | 24 | 0 | 0 | 0 | 2 | 41.2 | 45 | 10 | 0 | 18 | 13 |
