Round 1: They touch gloves. Duran moves in with a jab and Viana lands a counter left hand. Viana leaps in with a combination that knocks Duran down. Duran gets up. Viana lands a right hand to the body. He delivers a right hand to the jaw. Duran ties him up and presses him against the cage. Viana turns Duran. Viana separates. They both miss with winging right hands. Duran lands an inside leg kick. Viana lands a right hand that drops Duran. Duran gets back to his feet. Viana lands a right hook that face-plants Duran. Viana wins by TKO.
The official time of the stoppage was 4:05 of the first round.