While many had expected Dillashaw to beat Barao for a second time, few would have imagined it would have been achieved in such emphatic fashion as the American battered Barao into submission in dominating fashion.
Barao landed a few blows and a knee early on, but that aside he was largely a non-entity as he failed to register a takedown.
Dillashaw had Barao in trouble on the cage in as early as the first round as he landed good combination punches while disguising high kicks well with his hands.
With Barao slowing down in the third round after some grabbling in the second round had seemingly depleted his reserves, Dillashaw continued to go to work on his jaw, landing some heavy blows.
In the dying moments of the third round the champ almost finished matters with a big left hook, but Barao was saved by the bell.
Dillashaw came out firing in the fourth round and opened up a barrage of punches that boasted some great combinations. Barao was pinned against the cage and with little defence and referee Herb Dean stepped in to end the onslaught 35 seconds into the fourth round.