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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 |
|---|---|---|---|---|---|---|---|---|---|
| Dan MacDonald | 2021-2021 | .000 | 0 | 0 | 2 | 1 | 1 | 5.24 | 25 |
| Keith MacKey | 2020-2020 | .283 | 8 | 45 | 0 | 0 | 0 | 0.00 | 0 |
| Sean MacKnight | 2020-2021 | .232 | 2 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Enrique Madrid | 2020-2020 | .000 | 0 | 0 | 4 | 4 | 0 | 3.76 | 102 |
| Júlio Maes | 2020-2021 | .000 | 0 | 0 | 7 | 3 | 23 | 2.14 | 74 |
| Roberto Maestas | 2021-2021 | .350 | 0 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Cristo Maez | 2021-2021 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Henry Mann | 2021-2021 | .278 | 1 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Dinis Marcha | 2020-2021 | .297 | 2 | 65 | 0 | 0 | 0 | 0.00 | 0 |
| Roberto Marino | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Rubén Marino | 2020-2020 | .270 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Alejandro Márquez | 2021-2021 | .182 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Esteban Márquez | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Márquez | 2020-2021 | .259 | 5 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Pablo Marrero | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Andrés Martínez | 2020-2020 | .000 | 0 | 0 | 3 | 2 | 0 | 2.03 | 44 |
| Carlos Martínez | 2020-2021 | .000 | 0 | 0 | 8 | 7 | 0 | 2.78 | 170 |
| José Martínez | 2021-2021 | .000 | 0 | 0 | 1 | 1 | 0 | 1.59 | 7 |
| Juan Martínez | 2020-2020 | .000 | 0 | 0 | 0 | 1 | 1 | 3.48 | 10 |
| Manuel Martínez | 2020-2021 | .247 | 1 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Martínez | 2021-2021 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 4 |
| Ramón Martínez | 2020-2020 | .179 | 0 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Martínez | 2020-2021 | .250 | 20 | 79 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Martínez | 2020-2021 | .220 | 1 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Mason | 2020-2021 | .000 | 0 | 0 | 12 | 14 | 1 | 3.77 | 194 |
| Dan McBride | 2020-2020 | .000 | 0 | 0 | 6 | 5 | 0 | 3.44 | 86 |
| Forrest McCooke | 2020-2020 | .276 | 2 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Pat McCormick | 2020-2020 | .000 | 0 | 0 | 7 | 6 | 3 | 2.46 | 91 |
| Brandon McCullough | 2020-2021 | .199 | 4 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Thomas McGinnis | 2021-2021 | .000 | 0 | 0 | 5 | 2 | 2 | 3.38 | 55 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Ralph McKnight | 2020-2020 | .231 | 0 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Randall McLean | 2020-2021 | .000 | 0 | 0 | 3 | 4 | 0 | 3.88 | 41 |
| Salvadaro Meireles | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Mejía | 2021-2021 | .216 | 0 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Cristóbal Méndez | 2020-2021 | .000 | 0 | 0 | 8 | 9 | 0 | 4.60 | 88 |
| Jorge Méndez | 2020-2020 | .000 | 0 | 0 | 3 | 4 | 5 | 2.81 | 43 |
| Lorenzo Méndez | 2020-2021 | .000 | 0 | 0 | 1 | 0 | 0 | 4.60 | 13 |
| Santiago Mesa | 2020-2021 | .000 | 0 | 0 | 9 | 14 | 1 | 4.23 | 167 |
| Fred Meyer | 2020-2020 | .278 | 6 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Meza | 2020-2020 | .000 | 0 | 0 | 1 | 0 | 0 | 0.00 | 4 |
| Tommy Middleton | 2020-2020 | .000 | 0 | 0 | 1 | 2 | 0 | 2.59 | 37 |
| Phil Miles | 2021-2021 | .000 | 0 | 0 | 2 | 4 | 1 | 5.02 | 28 |
| William Miles | 2020-2021 | .281 | 9 | 64 | 0 | 0 | 0 | 0.00 | 0 |
| Artie Miller | 2020-2020 | .263 | 2 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Nick Miller | 2020-2020 | .400 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Phil Miller | 2021-2021 | .000 | 0 | 0 | 4 | 2 | 1 | 1.93 | 41 |
| Alfonso Miranda | 2020-2020 | .000 | 0 | 0 | 1 | 0 | 0 | 2.84 | 4 |
| Iván Miranda | 2020-2020 | .263 | 4 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Stanton Miranda | 2021-2021 | .000 | 0 | 0 | 4 | 0 | 16 | 0.59 | 66 |
| Dan Mitchell | 2020-2020 | .000 | 0 | 0 | 0 | 1 | 0 | 18.00 | 4 |
| Alfredo Mojica | 2021-2021 | .176 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Ramón Molina | 2020-2021 | .000 | 0 | 0 | 10 | 8 | 14 | 1.70 | 158 |
| Edén Mont | 2020-2021 | .261 | 3 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Tom Montgomery | 2020-2020 | .500 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Andy Moore | 2021-2021 | .219 | 0 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| John Moore | 2020-2020 | .231 | 0 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Phil Moore | 2020-2021 | .287 | 6 | 45 | 0 | 0 | 0 | 0.00 | 0 |
| Arturo Morales | 2021-2021 | .246 | 2 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Bartolo Morales | 2020-2021 | .306 | 2 | 64 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Morales | 2020-2021 | .235 | 0 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Melvin Morgan | 2021-2021 | .000 | 0 | 0 | 12 | 11 | 2 | 3.30 | 164 |
| Thomas Morris | 2021-2021 | .275 | 6 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Jeremy Murphy | 2020-2020 | .321 | 4 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Guy Mussi | 2020-2021 | .233 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
