Career
Mitchell then turned pro and defeated Bernard Hopkins on December 11, 1988, in their professional debuts. Mateen trained at the Bedford-Stuyvesant, Brooklyn Bachelor in 1988 and at Gleason"s Gym in 1989. M-16 Mateen went undefeated in his first twenty professional bouts, including wins over 12-0 Steve Pannell and 20-0 Billy Lewis.
M-16 Mateen also defeated Kevin Watts, Dale Jackson, and Drake Thadzi (who later defeated James Toney), fighters with a combined 65 wins, en route to winning the Nevada State and World Boxing Council Continental Americas Light heavyweight boxing title and rising as high as # 2 in the world ratings, before losing his title in the tenth round to Charles Williams (boxer).
Williams had fought in 11 consecutive IBF Light heavyweight world title fights before fighting Mateen. Grant went on to stop Thomas Hearns.
M-16 Mateen finished with a professional record 30-12-3 with 10 knockouts.