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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Maddy, Newton | RF | Oregon Academy Blues | 14 | 11/19/1903 | West Fargo | USAc | Right | Right | 179 cm | 165 lbs | - |
| Manley, Herminio | 2B | Carolina Academy Whites | 16 | 12/19/1901 | Grosse Pointe Woods | USAc | Right | Right | 180 cm | 170 lbs | - |
| Margerson, Anthony | SP | Texas Academy Reds | 18 | 09/07/1899 | Flint | USAc | Right | Right | 179 cm | 155 lbs | - |
| Marshall, Charles | RF | Oregon Academy Blues | 15 | 06/22/1902 | Temecula | USAc | Right | Right | 178 cm | 170 lbs | - |
| Marshall, Claude | RP | Appalachia Academy Reds | 17 | 03/27/1901 | Norfolk | USAc | Right | Right | 197 cm | 175 lbs | - |
| Marshall, Lloyd | RF | Oregon Academy Blues | 18 | 10/12/1899 | Chicago | USAc | Right | Right | 174 cm | 155 lbs | - |
| Marshall, Troy | LF | Appalachia Academy Reds | 16 | 03/19/1902 | Chico | USAc | Right | Right | 178 cm | 155 lbs | - |
| Martin, Felipe | CL | Oregon Academy Blues | 15 | 04/03/1903 | Gibsonton | USAc | Left | Left | 187 cm | 155 lbs | - |
| Martin, Lindsey | 3B | Mountain Academy Blacks | 17 | 12/07/1900 | Fallbrook | USAc | Right | Right | 180 cm | 155 lbs | - |
| Maskery, Howard | SS | Mid-Atlantic Academy Reds | 15 | 12/01/1902 | Worcester | USAc | Right | Right | 176 cm | 150 lbs | - |
| Maslen, Rex | RP | Great Plains Academy Blues | 16 | 06/16/1901 | Mounds View | USAc | Right | Right | 189 cm | 160 lbs | - |
| Mason, Rolla | RF | Mid-Atlantic Academy Reds | 16 | 09/21/1901 | Milwaukee | USAc | Right | Right | 184 cm | 180 lbs | - |
| Matcham, Royal | LF | New York Academy Blacks | 15 | 07/30/1902 | Taylor | USAc | Right | Right | 187 cm | 165 lbs | - |
| Matthews, Enoch | DH | Heartland Academy Blacks | 17 | 10/04/1900 | Chicago | USAc | Left | Right | 186 cm | 165 lbs | - |
| Matthews, Henry | CL | Great Plains Academy Blues | 17 | 05/08/1901 | Williams | USAc | Right | Right | 183 cm | 155 lbs | - |
| Mawdesley, Hayward | RF | Great Lakes Academy Whites | 17 | 09/01/1900 | Pomona | USAc | Right | Right | 179 cm | 165 lbs | - |
| Mawdesley, Peter | 1B | Pacific Academy Whites | 16 | 12/23/1901 | New Rochelle | USAc | Left | Left | 176 cm | 175 lbs | - |
| Mawle, Jefferso | SS | New England Academy Blues | 14 | 07/25/1903 | Mt. Pleasant | USAc | Right | Right | 176 cm | 160 lbs | - |
| Melville, Olin | SP | Appalachia Academy Reds | 17 | 08/06/1900 | Belchertown | USAc | Left | Left | 189 cm | 170 lbs | - |
| Merrell, John | 3B | Carolina Academy Whites | 14 | 10/20/1903 | Reading | USAc | Right | Right | 178 cm | 175 lbs | - |
| Merrill, George | DH | Gulf Academy Blues | 17 | 12/02/1900 | Dalton | USAc | Switch | Right | 190 cm | 170 lbs | - |
| Middlemiss, Michael | DH | New England Academy Blues | 17 | 07/23/1900 | Carson City | USAc | Right | Right | 183 cm | 160 lbs | - |
| Mifflin, Paul | LF | Mountain Academy Blacks | 17 | 11/10/1900 | Wilmington | USAc | Right | Right | 189 cm | 180 lbs | - |
| Milk, Domenic | DH | Great Lakes Academy Whites | 17 | 09/24/1900 | Hockessin | USAc | Left | Left | 180 cm | 150 lbs | - |
| Millard, Webster | 2B | Texas Academy Reds | 14 | 11/18/1903 | Marshfield | USAc | Left | Right | 178 cm | 160 lbs | - |
| Millen, William | 2B | New York Academy Blacks | 15 | 10/19/1902 | Everett | USAc | Right | Right | 180 cm | 175 lbs | - |
| Mills, Arvid | 3B | New England Academy Blues | 16 | 11/19/1901 | Brooklyn | USAc | Right | Right | 178 cm | 175 lbs | - |
| Mills, Cary | LF | Appalachia Academy Reds | 16 | 07/07/1901 | New Ulm | USAc | Right | Right | 186 cm | 200 lbs | - |
| Mills, Leslie | RP | Desert West Academy Whites | 15 | 03/11/1903 | Fayetteville | USAc | Switch | Right | 177 cm | 140 lbs | - |
| Mills, Mason | RP | Texas Academy Reds | 16 | 01/11/1902 | Pearl River | USAc | Left | Left | 183 cm | 155 lbs | - |
| Mills, Sanford | RP | New York Academy Blacks | 16 | 08/06/1901 | Los Angeles | USAc | Left | Right | 183 cm | 150 lbs | - |
| Milman, Keith | RP | Carolina Academy Whites | 16 | 12/08/1901 | Freeport | USAc | Right | Right | 176 cm | 145 lbs | - |
| Minshall, Carl | RF | Appalachia Academy Reds | 14 | 11/01/1903 | North Arlington | USAc | Left | Left | 169 cm | 145 lbs | - |
| Mitchell, James | 2B | Appalachia Academy Reds | 16 | 09/20/1901 | Edinburg | USAc | Right | Right | 185 cm | 185 lbs | - |
| Mitchell, Lionel | C | Heartland Academy Blacks | 16 | 12/19/1901 | Sheldon | USAc | Right | Right | 178 cm | 175 lbs | - |
| Mitchell, Lorenz | C | Tidewater Academy Blacks | 16 | 12/12/1901 | Oak Lawn | USAc | Right | Right | 176 cm | 180 lbs | - |
| Mogford, Cyrus | RF | California Academy Reds | 15 | 06/24/1902 | Union | USAc | Left | Left | 183 cm | 170 lbs | - |
| Monroe, Elmo | SS | Mountain Academy Blacks | 15 | 09/25/1902 | McAlester | USAc | Right | Right | 178 cm | 170 lbs | - |
| Moore, Arlo | 2B | Texas Academy Reds | 18 | 08/16/1899 | Murrieta | USAc | Right | Right | 176 cm | 145 lbs | - |
| Moore, Curtis | SS | New England Academy Blues | 17 | 04/30/1901 | West Sacramento | USAc | Right | Right | 178 cm | 165 lbs | - |
| Moore, Palmer | C | Great Plains Academy Blues | 15 | 08/06/1902 | Los Altos | USAc | Right | Right | 173 cm | 165 lbs | - |
| Morrison, Parker | SS | Great Plains Academy Blues | 17 | 08/04/1900 | Los Angeles | USAc | Right | Right | 182 cm | 160 lbs | - |
| Morse, Winston | 1B | Mountain Academy Blacks | 18 | 05/09/1900 | Chicago | USAc | Right | Right | 182 cm | 180 lbs | - |
| Mossop, Evan | RF | Desert West Academy Whites | 15 | 05/14/1903 | Boston | USAc | Right | Left | 171 cm | 155 lbs | - |
| Motley, Miller | RP | Mid-Atlantic Academy Reds | 18 | 05/29/1900 | High Point | USAc | Right | Right | 182 cm | 160 lbs | - |
| Motten, Chauncy | SP | Appalachia Academy Reds | 14 | 08/09/1903 | Aurora | USAc | Left | Left | 170 cm | 125 lbs | - |
| Mottershead, Thomas | RF | Heartland Academy Blacks | 15 | 09/01/1902 | Walnut Ridge | USAc | Left | Left | 185 cm | 180 lbs | - |
| Mottram, Mahlon | C | Pacific Academy Whites | 17 | 08/07/1900 | Emporia | USAc | Right | Right | 177 cm | 165 lbs | - |
| Mugglestone, Benito | RP | Carolina Academy Whites | 16 | 07/06/1901 | Chicago | USAc | Right | Right | 185 cm | 155 lbs | - |
| Murcott, George | RP | New England Academy Blues | 14 | 06/16/1903 | Palm Coast | USAc | Left | Right | 172 cm | 130 lbs | - |
