In May 2014 at UFC 173, the 29-year-old Dillashaw caused one of the biggest upsets in the history of the division when he shocked then-champion Barao in the fifth round of their title fight.
As is the norm when a long-standing champion loses his belt, Barao was granted a rematch, scheduled for UFC 177 three months later in Sacramento, California.
That fight never took place when Barao failed to make wait and Dillashaw had little trouble in dispatching of the late replacement – Joe Soto.
Whilst Saturday's rematch at UFC on Fox 16 will see Dillashaw go into the fight as the champion and Barao the challenger, his preparation this time around is much the same as when he beat the Brazilian 14 months ago.
"I'm actually taking this fight with the same mindset," Dillashaw told Bleacher Report.
"I was confident going into that last fight with him that I was going to win. The only people who believed in me were my team and my family, and that's all that matters. I'm going in, and I'm nervous about my opponent. If I weren't nervous, then I wouldn't be ready. I'm respecting what he has, because if I don't I'm going to get caught. I'm going to treat it as the same kind of fight. I'm not going to overlook the guy and think it's going to be an easy fight.
"I'm going in there expecting a five-round war and looking for the finish.
"This fight is about proving dominance in my weight class.
"If it's Renan Barao or whoever I fight, it doesn't make a difference to me. I don't have a chip on my shoulder that I'm fighting him again. I don't have anything like that. I'm looking at this fight with him as just another opponent."