ATLANTA – Frank Mir ’s venture into the boxing world proved unsuccessful Saturday. Mir, a former UFC heavyweight champion and interim titleholder, transitioned into the ring as a sizable underdog to a far more experienced foe in Steve Cunningham . It showed in the bout, as Cunningham displayed his seasoning to get the win by unanimous decision with scores of 60-54, 60-54, 58-56. The heavyweight bout was part of the Triller Fight Club main card at Mercedes-Benz Stadium. The event aired on pay-per-view. After weighing in 70 pounds heavier than Cunningham on Friday, Mir attempted to put his size to use early in the fight.