Round 1: Dillashaw closes the distance with a jab. Dillashaw moved in and Viana lands a left hook that knocks Dillashaw down. Dillashaw secures a takedown and takes Viana’s back. Viana scrambles out. They battle for position along the cage. Dillashaw lands a knee to the body. They separate. Dillashaw lands a right hand that wobbles Viana. Dillashaw lands a left hand. Dillashaw misses with a high kick. Dillashaw ducks under a punch and works for a takedown. Viana shakes it off. Dillashaw lands a right hand as Viana moved in and knocks Viana down. Dillashaw swarms with strikes. He lands a right hand and Viana is back down. Dillashaw finishes with strikes on the ground.
The official time of the stoppage was 4:22 of the first round.