Former UFC heavyweight champion Frank Mir is happy to still be facing a worthy opponent in his professional boxing debut. Mir’s original opponent, 52-year-old Antonio Tarver , was forced out when the Georgia Athletic and Entertainment Commission did not grant him a license to compete. Instead, Mir, 41, will take on Steve Cunningham under the Triller Fight Club on Saturday at Mercedes-Benz Stadium in Atlanta. When Tarver withdrew, Mir admits he was worried he’d wind up facing an unestablished name.