| Player | POS | Team | NUM | Height | Weight | DOB |
|---|---|---|---|---|---|---|
| Machado, Andres | RP | WAS | 57 | 6'0" | 220 lbs | Apr 22, 1993 |
| Machado, Manny | 3B | SD | 13 | 6'3" | 218 lbs | Jul 6, 1992 |
| Machin, Vimael | 2B | OAK | 31 | 5'11" | 185 lbs | Sep 25, 1993 |
| Madero, Luis | RP | MIA | 70 | 6'1" | 195 lbs | Apr 15, 1997 |
| Madrigal, Nick | 2B | CHC | 1 | 5'8" | 175 lbs | Mar 5, 1997 |
| Maeda, Kenta | SP | MIN | 18 | 6'1" | 185 lbs | Apr 11, 1988 |
| Mahle, Tyler | SP | CIN | 30 | 6'3" | 210 lbs | Sep 29, 1994 |
| Maldonado, Martin | C | HOU | 15 | 6'0" | 230 lbs | Aug 16, 1986 |
| Manaea, Sean | SP | OAK | 55 | 6'5" | 245 lbs | Feb 1, 1992 |
| Mancini, Trey | RF | BAL | 16 | 6'3" | 230 lbs | Mar 18, 1992 |
| Manning, Matt | SP | DET | 25 | 6'6" | 195 lbs | Jan 28, 1998 |
| Manoah, Alek | SP | TOR | 6 | 6'6" | 260 lbs | Jan 9, 1998 |
| Mantiply, Joe | RP | ARI | 35 | 6'4" | 219 lbs | Mar 1, 1991 |
| Margevicius, Nick | SP | SEA | 52 | 6'5" | 220 lbs | Jun 18, 1996 |
| Margot, Manuel | CF | TB | 13 | 5'11" | 180 lbs | Sep 28, 1994 |
| Marisnick, Jake | CF | SD | 16 | 6'4" | 220 lbs | Mar 30, 1991 |
| Marquez, German | SP | COL | 48 | 6'1" | 230 lbs | Feb 22, 1995 |
| Marsh, Brandon | CF | LAA | 16 | 6'4" | 215 lbs | Dec 18, 1997 |
| Marshall, Evan | RP | CHW | 43 | 6'2" | 235 lbs | Apr 18, 1990 |
| Marte, Ketel | CF | ARI | 4 | 6'1" | 210 lbs | Oct 12, 1993 |
| Marte, Starling | CF | OAK | 2 | 6'1" | 195 lbs | Oct 9, 1988 |
| Martin, Brett | RP | TEX | 59 | 6'4" | 200 lbs | Apr 28, 1995 |
| Martin, Chris | RP | ATL | 55 | 6'8" | 225 lbs | Jun 2, 1986 |
| Martin, Richie | SS | BAL | 1 | 6'0" | 190 lbs | Dec 22, 1994 |
| Martinez, Carlos | SP | STL | 18 | 6'0" | 200 lbs | Sep 21, 1991 |
| Martinez, J.D. | RF | BOS | 28 | 6'3" | 230 lbs | Aug 21, 1987 |
| Martinez, Jose | LF | NYM | 16 | 6'6" | 215 lbs | Jul 25, 1988 |
| Martini, Nick | LF | CHC | 62 | 5'11" | 205 lbs | Jun 27, 1990 |
| Mateo, Jorge | SS | BAL | 26 | 6'0" | 182 lbs | Jun 23, 1995 |
| Mathias, Carl | 2B | MIL | 13 | 5'11" | 0 lbs | Jan 1, 0001 |
| Maton, Nick | SS | PHI | 29 | 6'2" | 178 lbs | Feb 18, 1997 |
| Maton, Phil | RP | HOU | 88 | 6'2" | 206 lbs | Mar 25, 1993 |
| Matz, Steven | SP | TOR | 22 | 6'2" | 201 lbs | May 29, 1991 |
| Matzek, Tyler | RP | ATL | 68 | 6'3" | 230 lbs | Oct 19, 1990 |
| May, Dustin | SP | LAD | 85 | 6'6" | 180 lbs | Sep 6, 1997 |
| May, Trevor | RP | NYM | 65 | 6'5" | 240 lbs | Sep 23, 1989 |
| Mayers, Mike | RP | LAA | 21 | 6'2" | 220 lbs | Dec 6, 1991 |
| Mayfield, Jack | 2B | LAA | 9 | 5'11" | 190 lbs | Sep 30, 1990 |
| Mayza, Tim | RP | TOR | 58 | 6'3" | 220 lbs | Jan 15, 1992 |
| McCann, James | C | NYM | 33 | 6'3" | 220 lbs | Jun 13, 1990 |
| McCarthy, Jake | CF | ARI | 30 | 6'2" | 215 lbs | Jul 30, 1997 |
| McClanahan, Shane | SP | TB | 62 | 6'1" | 200 lbs | Apr 28, 1997 |
| McCormick, Chas | LF | HOU | 20 | 6'0" | 208 lbs | Apr 19, 1995 |
| McCullers Jr., Lance | SP | HOU | 43 | 6'1" | 202 lbs | Oct 2, 1993 |
| McCutchen, Andrew | RF | PHI | 22 | 5'11" | 195 lbs | Oct 10, 1986 |
| McFarland, T.J. | RP | STL | 62 | 6'3" | 200 lbs | Jun 8, 1989 |
| McGee, Jake | RP | SF | 17 | 6'4" | 229 lbs | Aug 6, 1986 |
| McGowin, Kyle | RP | WAS | 61 | 6'3" | 202 lbs | Nov 27, 1991 |
| McGuire, Reese | C | TOR | 7 | 6'0" | 215 lbs | Mar 2, 1995 |
| McHugh, Collin | RP | TB | 31 | 6'2" | 191 lbs | Jun 19, 1987 |
| McKenna, Ryan | CF | BAL | 65 | 5'11" | 195 lbs | Feb 14, 1997 |
| McKenzie, Triston | SP | CLE | 24 | 6'5" | 165 lbs | Aug 2, 1997 |
| McKinney, Billy | LF | LAD | 29 | 6'1" | 205 lbs | Aug 23, 1994 |
| McMahon, Ryan | 2B | COL | 24 | 6'2" | 219 lbs | Dec 14, 1994 |
| McNeil, Jeff | 3B | NYM | 6 | 6'1" | 195 lbs | Apr 8, 1992 |
| Meadows, Austin | CF | TB | 17 | 6'3" | 225 lbs | May 3, 1995 |
| Means, John | SP | BAL | 47 | 6'3" | 235 lbs | Apr 24, 1993 |
| Mears, Nick | RP | PIT | 36 | 6'2" | 200 lbs | Oct 7, 1996 |
| Medina, Adonis | SP | PHI | 77 | 6'1" | 187 lbs | Dec 18, 1996 |
| Megill, Trevor | RP | CHC | 74 | 6'8" | 250 lbs | Dec 5, 1993 |
| Megill, Tylor | SP | NYM | 38 | 6'7" | 230 lbs | Jul 28, 1995 |
| Mejia, Francisco | C | TB | 28 | 5'8" | 188 lbs | Oct 27, 1995 |
| Mejia, Humberto | RP | ARI | 62 | 6'4" | 244 lbs | Mar 3, 1997 |
| Melancon, Mark | RP | SD | 33 | 6'1" | 215 lbs | Mar 28, 1985 |
| Mercado, Oscar | CF | CLE | 35 | 6'2" | 197 lbs | Dec 16, 1994 |
| Mercer, Jordy | SS | WAS | 27 | 6'3" | 210 lbs | Aug 27, 1986 |
| Merrifield, Whit | 2B | KC | 15 | 6'1" | 195 lbs | Jan 24, 1989 |
| Merryweather, Julian | RP | TOR | 67 | 6'4" | 215 lbs | Oct 14, 1991 |
| Meyers, Jake | CF | HOU | 6 | 6'0" | 200 lbs | Jun 18, 1996 |
| Mikolas, Miles | SP | STL | 39 | 6'4" | 230 lbs | Aug 23, 1988 |
| Miley, Wade | SP | CIN | 22 | 6'2" | 220 lbs | Nov 13, 1986 |
| Miller, Andrew | RP | STL | 21 | 6'7" | 200 lbs | May 21, 1985 |
| Miller, Brad | 2B | PHI | 13 | 6'2" | 195 lbs | Oct 18, 1989 |
| Miller, Justin | RP | STL | 60 | 6'3" | 225 lbs | Jun 13, 1987 |
| Miller, Owen | SS | CLE | 6 | 6'0" | 185 lbs | Nov 15, 1996 |
| Miller, Shelby | SP | PIT | 50 | 6'3" | 225 lbs | Oct 10, 1990 |
| Mills, Alec | SP | CHC | 30 | 6'4" | 205 lbs | Nov 30, 1991 |
| Minaya, Juan | RP | MIN | 49 | 6'4" | 210 lbs | Sep 18, 1990 |
| Minor, Mike | SP | KC | 23 | 6'4" | 210 lbs | Dec 26, 1987 |
| Minter, A.J. | RP | ATL | 33 | 6'0" | 215 lbs | Sep 2, 1993 |
| Misiewicz, Anthony | RP | SEA | 38 | 6'1" | 200 lbs | Nov 1, 1994 |
| Mize, Casey | SP | DET | 12 | 6'3" | 220 lbs | May 1, 1997 |
| Molina, Yadier | C | STL | 4 | 5'11" | 225 lbs | Jul 13, 1982 |
| Moll, Sam | RP | OAK | 60 | 5'9" | 190 lbs | Jan 3, 1992 |
| Moncada, Yoan | 3B | CHW | 10 | 6'2" | 225 lbs | May 27, 1995 |
| Mondesi, Adalberto | SS | KC | 27 | 6'1" | 200 lbs | Jul 27, 1995 |
| Montas, Frankie | SP | OAK | 47 | 6'2" | 255 lbs | Mar 21, 1993 |
| Montero, Rafael | RP | HOU | 47 | 6'0" | 190 lbs | Oct 17, 1990 |
| Montgomery, Jordan | SP | NYY | 47 | 6'6" | 228 lbs | Dec 27, 1992 |
| Moore, Dylan | 3B | SEA | 25 | 6'0" | 185 lbs | Aug 2, 1992 |
| Moore, Matt | SP | PHI | 48 | 6'3" | 210 lbs | Jun 18, 1989 |
| Moran, Colin | 3B | PIT | 19 | 6'4" | 225 lbs | Oct 1, 1992 |
| Moran, Jovani | RP | MIN | 71 | 6'1" | 167 lbs | Apr 24, 1997 |
| Morejon, Adrian | SP | SD | 50 | 5'11" | 224 lbs | Feb 27, 1999 |
| Moreland, Mitch | 1B | OAK | 18 | 6'3" | 245 lbs | Sep 6, 1985 |
| Moreta, Dauri | RP | CIN | 0 | 6'2" | 185 lbs | Apr 15, 1996 |
| Morgan, Adam | RP | CHC | 47 | 6'1" | 200 lbs | Feb 27, 1990 |
| Morgan, Eli | SP | CLE | 49 | 5'10" | 190 lbs | May 13, 1996 |
| Moroff, Max | 2B | STL | 67 | 5'10" | 190 lbs | May 13, 1993 |
| Morton, Charlie | SP | ATL | 50 | 6'5" | 215 lbs | Nov 12, 1983 |
| Mountcastle, Ryan | 1B | BAL | 6 | 6'4" | 230 lbs | Feb 18, 1997 |
| Moustakas, Mike | 2B | CIN | 9 | 6'0" | 225 lbs | Sep 11, 1988 |
| Mullins, Cedric | CF | BAL | 31 | 5'8" | 175 lbs | Oct 1, 1994 |
| Muncy, Max | 1B | LAD | 13 | 6'0" | 215 lbs | Aug 25, 1990 |
| Munoz, Andres | RP | SEA | 54 | 6'2" | 243 lbs | Jan 16, 1999 |
| Munoz, Yairo | CF | BOS | 60 | 5'11" | 200 lbs | Jan 23, 1995 |
| Murphy, Patrick | RP | WAS | 52 | 6'5" | 235 lbs | Jun 10, 1995 |
| Murphy, Sean | C | OAK | 12 | 6'3" | 228 lbs | Oct 4, 1994 |
| Murphy, Tom | C | SEA | 2 | 6'1" | 218 lbs | Apr 3, 1991 |
| Musgrove, Joe | SP | SD | 44 | 6'5" | 230 lbs | Dec 4, 1992 |
| Myers, Wil | LF | SD | 5 | 6'3" | 207 lbs | Dec 10, 1990 |
