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Hamman began training mixed martial arts at the Unbreakable Gym under Brian Warren in November 2005 and made his professional debut in 2006. He currently trains with Vladimir Matyushenko on the VMAT team. Hamman received national attention while fighting for the now-defunct EliteXC under their ShoXC banner on the cable network Showtime, most notably for a two-fight series against B.J. Penn fighter Poai Suganuma.