- Mabuza, Kaizer
- Macargo, Al
- Maciunski, Darren
- Mack, Ed
- Mack, Marvin
- Mack, Randy
- Mack, Steve
- Mack, Willie
- Macklin, Matt
- Majewski, Patrick
- Maldonado, Francisco
- Maldonado, Sixto
- Malulu, Mashaka
- Mancillas, Leobardo
- Mandujano, Jose
- Manfredo, Jr., Peter
- Manfredy, Angel
- Manley , Joe
- Manley, Joe
- Mann, Ralph
- Mann, Teddy
- Maquillon, Brinatti
- Marcus, Edgerton
- Mares, Abner
- Marin, Delfino
- Marks, Larry
- Marquez, Felix
- Marquez, Mariano
- Marquez, Raul
- Marquez, Ruben
- Martin , Darrell
- Martin, Darryl
- Martin, Jerry
- Martin, Keith
- Martin, Steve
- Martin, Tony
- Martinez, Cesar
- Martinez, Julio
- Martinez, Pedro
- Martinez, Raul
- Martinez, Rogelio
- Martinez, Steven
- Martinez, Tiger
- Martinez, William
- Martino, John
- Mastrangelo, Billy
- Matador, Pony, Pony
- Mateen, Ernest
- Mathis, Curtis
- Matkivsky, Volodymyr
- Matthews, Dennis
- Matthews, Julio Cesar
- Matthews, Matt
- Matthews, Michael
- Maxwell, Troy
- Maysonet, Jorge
- Maysonet, Luis
- Mayweather, Sr., Floyd
- McAndrews, Bobby
- McCain, Rich
- McCall, Andre
- McCants, Phil
- McCarthy, Bobby
- McCaskill, James
- McCladon, Virgil
- McCloud, Art
- McCole, DeAndre
- McCray, James
- McCray, Rocky
- McCrory, Milton
- McCuiston, Thomas
- McCullough, Wayne
- McDonald, Willie
- McDowel, Marvin
- McGarvey, Ron
- McGhee, Greg
- McGill, Sam
- McGinley, Brian
- McGrew, Darren
- McGroom, Terry
- McGuire , Tom
- McGuire, Tom
- McKart, Bronco
- McKenzie, Adrian
- McKenzie, Garfield
- McKinney, Dennis
- McLean, Bernard
- McLean, Jerome
- McMurren, John
- McNeal, Willie
- McNeil, Willie
- McQueen, John
- Medina (NH), Jose
- Medina (PHL), Jose
- Medina, Eberto
- Medina, Jason
- Medina, Jose
- Medina, Jose (PHL)
- Medina, Jose Macho
- Medina, Ricardo
- Medina, Roberto
- Meeks, Vernon
- Mejias, Alex
- Mejias, Luis
- Mejias, Sammy
- Melendez, Luis
- Melendez, Sergio
- Melvin, Michael
- Melvin, Mike
- Mendez, Luis
- Mendez, Roberto
- Mercado, Josh
- Mercado, Joshua
- Mercado, Segundo
- Mercedes, Alberto
- Mike , Jones
- Miles, Tyrone
- Miller, John
- Miller, Mike
- Miller, Nate
- Miller, Rufus
- Milligan, Henry
- Mills, Jesse
- Minter, Derrick
- Miranda, William
- Mitchell, Bennie
- Mitchell, Danny
- Mitchell, Eric
- Mitchell, Frankie
- Mitchell, Kilpatrick
- Mitchell, Michael
- Mitchell, Sharumba
- Mitchell, Tyrone
- Mobley, Cortez
- Mohamed, Yamin
- Molina, Moses
- Molnar, John
- Moncrief, Ralph
- Monroe 2d, Willie
- Monroe, 2d, Willie
- Monroe, Willie
- Monroe, Willie 2
- Montalvo, Rafael
- Montellano, Felipe
- Montero, Miguel
- Montgomery, Frank
- Montiel, Francisco
- Moore, Denver Rodney
- Moore, Paul
- Moore, Rodney
- Moore, Ty
- Moore, Walter
- Moorer, Michael
- Moorman, Earl
- Mora, Francisco
- Morales, Dan
- Morales, Erik
- Morales, Jaime
- Morales, Joe
- Morales, Jose
- Morales, Luis
- Morales, William
- Moreno, Isaac
- Morgan, Dan
- Morgan, Earl
- Morgan, Lenzie
- Morris, William
- Morrison, Tommy
- Mosley, Shane
- Moultrie, Stacey
- Mtagwa, Rogers
- Muhammad, Ali
- Muhammad, Ali Karim
- Muhammad, Ali Saad
- Muhammad, Markel
- Muhammad, Raquib
- Muhammad, Saleem
- Muhammad, Sulaiman
- Muhammad, Wali
- Muhammad, Zakee
- Muhammad,, Hassan
- Mullings, Keith
- Mundy, Latif
- Mungin, Mike
- Muniz , Oscar
- Muniz, Oscar
- Munoz, Hector
- Munoz, Mario
- Munoz, Ruben
- Murata , Eijiro
- Muriel, Juan
- Murray, Charles
- Murray, Harvey
- Muse, Jimmy
- Muse, Keema
- Muse, Kema
- Muse, Kenny
- Muse, Tracy
- Mussachio, Chuck
- Myers, Loren
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