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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
|---|---|---|---|---|---|---|---|---|---|
| Art Mahan | 1890-1890 | .077 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Frank Maher | 1890-1890 | .236 | 1 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Theo Manuel | 1890-1890 | .301 | 1 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Frank McCabe | 1890-1890 | .140 | 0 | 2 | 8 | 7 | 0 | 3.71 | 31 |
| Hank McCann | 1890-1890 | .185 | 2 | 17 | 21 | 26 | 0 | 2.88 | 128 |
| Clarence McCarthy | 1890-1890 | .262 | 3 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Ike McCoy | 1890-1890 | .000 | 0 | 0 | 0 | 0 | 0 | 1.09 | 20 |
| Al McDonough | 1890-1890 | .148 | 0 | 4 | 12 | 24 | 0 | 4.12 | 43 |
| Lou McElroy | 1890-1890 | .291 | 0 | 8 | 13 | 15 | 1 | 4.43 | 72 |
| Walt McGee | 1890-1890 | .214 | 0 | 0 | 0 | 0 | 0 | 9.00 | 3 |
| Jean McRae | 1890-1890 | .193 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| David Meehan | 1890-1890 | .257 | 1 | 73 | 0 | 0 | 0 | 0.00 | 0 |
| Elmer Meier | 1890-1890 | .151 | 0 | 10 | 24 | 21 | 1 | 2.50 | 243 |
| Oliver Menzies | 1890-1890 | .276 | 7 | 73 | 0 | 0 | 0 | 0.00 | 0 |
| Alfred Mercier | 1890-1890 | .241 | 0 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| George Merritt | 1890-1890 | .255 | 0 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Walt Merritt | 1890-1890 | .204 | 1 | 28 | 25 | 11 | 2 | 2.34 | 181 |
| Charley Mertens | 1890-1890 | .282 | 0 | 61 | 0 | 0 | 0 | 0.00 | 0 |
| Cal Middleton | 1890-1890 | .255 | 9 | 76 | 0 | 0 | 0 | 0.00 | 0 |
| Jasper Milson | 1890-1890 | .250 | 2 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Dan Mitchell | 1890-1890 | .271 | 5 | 76 | 0 | 0 | 0 | 0.00 | 0 |
| George Mulligan | 1890-1890 | .213 | 0 | 8 | 18 | 15 | 0 | 3.88 | 66 |
