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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 |
|---|---|---|---|---|---|---|---|---|---|
| Manny Machado | 2020-2020 | .273 | 29 | 92 | 0 | 0 | 0 | 0.00 | 0 |
| Nick Madrigal | 2020-2020 | .310 | 1 | 23 | 0 | 0 | 0 | 6.75 | 1 |
| Kenta Maeda | 2020-2020 | .000 | 0 | 0 | 12 | 5 | 0 | 4.09 | 228 |
| Tyler Mahle | 2020-2020 | .000 | 0 | 0 | 12 | 11 | 0 | 4.26 | 255 |
| Mikie Mahtook | 2020-2020 | .208 | 7 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Sean Manaea | 2020-2020 | .000 | 0 | 0 | 9 | 12 | 0 | 5.56 | 188 |
| Trey Mancini | 2020-2020 | .239 | 20 | 66 | 0 | 0 | 0 | 0.00 | 0 |
| Matt Manning | 2020-2020 | .000 | 0 | 0 | 12 | 5 | 0 | 3.71 | 144 |
| Dillon Maples | 2020-2020 | .000 | 0 | 0 | 0 | 3 | 0 | 5.54 | 35 |
| Nick Margevicius | 2020-2020 | .000 | 0 | 0 | 5 | 12 | 0 | 6.15 | 143 |
| Manuel Margot | 2020-2020 | .205 | 8 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Jake Marisnick | 2020-2020 | .250 | 15 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Nick Markakis | 2020-2020 | .257 | 15 | 56 | 0 | 0 | 0 | 0.00 | 0 |
| Parker Markel | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 7 |
| German Marquez | 2020-2020 | .000 | 0 | 0 | 14 | 3 | 0 | 3.76 | 221 |
| Ketel Marte | 2020-2020 | .276 | 23 | 84 | 0 | 0 | 0 | 0.00 | 0 |
| Starling Marte | 2020-2020 | .283 | 18 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Brett Martin | 2020-2020 | .000 | 0 | 0 | 0 | 1 | 0 | 17.36 | 5 |
| Chris Martin | 2020-2020 | .000 | 0 | 0 | 1 | 4 | 2 | 5.51 | 14 |
| Russell Martin | 2020-2020 | .750 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Martinez | 2020-2020 | .000 | 0 | 0 | 13 | 8 | 0 | 4.18 | 189 |
| J.D. Martinez | 2020-2020 | .258 | 41 | 113 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Martinez | 2020-2020 | .265 | 19 | 61 | 0 | 0 | 0 | 0.00 | 0 |
| James Marvel | 2020-2020 | .000 | 0 | 0 | 1 | 1 | 0 | 4.38 | 13 |
| Wyatt Mathisen | 2020-2020 | .000 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Steven Matz | 2020-2020 | .000 | 0 | 0 | 4 | 13 | 0 | 6.46 | 142 |
| Dustin May | 2020-2020 | .000 | 0 | 0 | 1 | 1 | 0 | 2.67 | 38 |
| Trevor May | 2020-2020 | .000 | 0 | 0 | 0 | 5 | 2 | 4.64 | 93 |
| Cameron Maybin | 2020-2020 | .237 | 7 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Nomar Mazara | 2020-2020 | .258 | 28 | 69 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Zach McAllister | 2020-2020 | .000 | 0 | 0 | 0 | 2 | 2 | 6.89 | 32 |
| James McCann | 2020-2020 | .198 | 3 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Kevin McCanna | 2020-2020 | .000 | 0 | 0 | 4 | 3 | 0 | 5.52 | 110 |
| Darren McCaughan | 2020-2020 | .000 | 0 | 0 | 1 | 1 | 0 | 7.24 | 14 |
| Reggie McClain | 2020-2020 | .000 | 0 | 0 | 5 | 1 | 2 | 3.44 | 135 |
| Lance McCullers Jr. | 2020-2020 | .000 | 0 | 0 | 6 | 11 | 2 | 5.63 | 175 |
| Andrew McCutchen | 2020-2020 | .246 | 27 | 88 | 0 | 0 | 0 | 0.00 | 0 |
| T.J. McFarland | 2020-2020 | .000 | 0 | 0 | 4 | 1 | 2 | 4.27 | 43 |
| Reese McGuire | 2020-2020 | .277 | 4 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Collin McHugh | 2020-2020 | .000 | 0 | 0 | 11 | 11 | 0 | 4.83 | 191 |
| Brendan McKay | 2020-2020 | .000 | 0 | 1 | 0 | 2 | 0 | 9.00 | 22 |
| David McKay | 2020-2020 | .000 | 0 | 0 | 4 | 7 | 4 | 6.34 | 91 |
| Zach McKinstry | 2020-2020 | .303 | 10 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Ryan McMahon | 2020-2020 | .297 | 21 | 61 | 0 | 0 | 0 | 0.00 | 0 |
| Jeff McNeil | 2020-2020 | .320 | 25 | 79 | 0 | 0 | 0 | 0.00 | 0 |
| Austin Meadows | 2020-2020 | .310 | 48 | 104 | 0 | 0 | 0 | 0.00 | 0 |
| John Means | 2020-2020 | .000 | 0 | 0 | 2 | 5 | 0 | 5.79 | 72 |
| Trevor Megill | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 45.00 | 1 |
| Tylor Megill | 2020-2020 | .000 | 0 | 0 | 0 | 1 | 0 | 4.15 | 5 |
| Francisco Mejia | 2020-2020 | .291 | 18 | 69 | 0 | 0 | 0 | 0.00 | 0 |
| Mark Melancon | 2020-2020 | .000 | 0 | 0 | 3 | 2 | 1 | 3.12 | 69 |
| Oscar Mercado | 2020-2020 | .276 | 4 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Yermin Mercedes | 2020-2020 | .500 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Jordy Mercer | 2020-2020 | .375 | 2 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Whit Merrifield | 2020-2020 | .231 | 9 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Miles Mikolas | 2020-2020 | .000 | 0 | 0 | 2 | 6 | 1 | 7.51 | 45 |
| Wade Miley | 2020-2020 | .000 | 0 | 0 | 0 | 6 | 0 | 9.94 | 40 |
| Andrew Miller | 2020-2020 | .000 | 0 | 0 | 1 | 4 | 3 | 4.42 | 54 |
| Brad Miller | 2020-2020 | .205 | 17 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Shelby Miller | 2020-2020 | .000 | 0 | 0 | 1 | 5 | 0 | 10.55 | 32 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Tyson Miller | 2020-2020 | .000 | 0 | 0 | 1 | 2 | 0 | 3.60 | 24 |
| Alec Mills | 2020-2020 | .000 | 0 | 0 | 5 | 2 | 3 | 5.72 | 127 |
| Wyatt Mills | 2020-2020 | .000 | 0 | 0 | 1 | 0 | 0 | 7.88 | 20 |
| Hoby Milner | 2020-2020 | .000 | 0 | 0 | 4 | 2 | 3 | 4.20 | 38 |
| Mike Minor | 2020-2020 | .000 | 0 | 0 | 8 | 6 | 1 | 5.04 | 160 |
| A.J. Minter | 2020-2020 | .000 | 0 | 0 | 0 | 2 | 0 | 4.82 | 21 |
| Casey Mize | 2020-2020 | .000 | 0 | 0 | 4 | 1 | 0 | 5.81 | 38 |
| Yadier Molina | 2020-2020 | .249 | 10 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Dustin Molleken | 2020-2020 | .000 | 0 | 0 | 0 | 1 | 0 | 4.26 | 44 |
| Yoan Moncada | 2020-2020 | .285 | 37 | 107 | 0 | 0 | 0 | 0.00 | 0 |
| Adalberto Mondesi | 2020-2020 | .227 | 5 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Frankie Montas | 2020-2020 | .000 | 0 | 0 | 9 | 8 | 0 | 5.11 | 224 |
| Rafael Montero | 2020-2020 | .000 | 0 | 0 | 6 | 2 | 3 | 5.35 | 83 |
| Jordan Montgomery | 2020-2020 | .000 | 0 | 0 | 3 | 1 | 1 | 4.45 | 33 |
| Mark Montgomery | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 2.08 | 5 |
| Dylan Moore | 2020-2020 | .155 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Brian Moran | 2020-2020 | .000 | 0 | 0 | 1 | 1 | 0 | 6.00 | 7 |
| Reyes Moronta | 2020-2020 | .000 | 0 | 0 | 1 | 0 | 2 | 5.90 | 41 |
| Logan Morrison | 2020-2020 | .244 | 13 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Brandon Morrow | 2020-2020 | .000 | 0 | 0 | 2 | 5 | 17 | 5.95 | 47 |
| Charlie Morton | 2020-2020 | .000 | 0 | 0 | 0 | 1 | 0 | 16.88 | 0 |
| Scott Moss | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 6.86 | 36 |
| Ryan Mountcastle | 2020-2020 | .268 | 10 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Moustakas | 2020-2020 | .268 | 46 | 132 | 0 | 0 | 0 | 0.00 | 0 |
| Max Muncy | 2020-2020 | .262 | 62 | 141 | 0 | 0 | 0 | 0.00 | 0 |
| Andres Munoz | 2020-2020 | .000 | 0 | 0 | 4 | 3 | 3 | 3.63 | 123 |
| Daniel Murphy | 2020-2020 | .306 | 22 | 71 | 0 | 0 | 0 | 0.00 | 0 |
| John Ryan Murphy | 2020-2020 | .216 | 7 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Sean Murphy | 2020-2020 | .229 | 8 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Tom Murphy | 2020-2020 | .210 | 20 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Joe Musgrove | 2020-2020 | .000 | 0 | 0 | 11 | 12 | 0 | 3.58 | 221 |
| DJ Myers | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 2 | 6.31 | 79 |
| Wil Myers | 2020-2020 | .227 | 9 | 25 | 0 | 0 | 0 | 0.00 | 0 |
