Asked why he took his shorts off, his explanation to interviewer Joe Rogan was simple.
Anthony Pettis was the UFC lightweight champ for a spell, and though he's since fallen down the ladder a bit, he's remained an elite - and highly creative - striker.
McGregor's comeback is unquestionably a factor in that, the 30-year-old set to compete in mixed martial arts for the first time since November 2016, when he defeated Eddie Alvarez to become the only fighter to simultaneously hold two UFC titles. You son of a bitch, I'll give you a proper ass whooping any day.
Here's a look at how the fight went down. Left jab by Ferguson and a kick.
In an wonderful turn of events, Ferguson started pouring on the punishment with a relentless offensive onslaught that had Pettis bloodied and backing up. Ferguson kicks inside now. Push kick for Ferguson. Low leg kick for Ferguson now. One-two lands. Pettis offers high, but misses. Uppercut lands in close for Ferguson. Ferguson was rocked two times he is still in survival mode.
Pettis attempted to get the finish but Ferguson did a masterful job of holding on until he could regain his composure.
Lewis was given a rousing speech by his corner before the start of the third round with one telling him: "I need you to breathe for me".
Punches for Ferguson who is continually marching down Pettis here.
Ferguson with another strike and Pettis backs up across the cage.
El Cucuy on the top raining punches on the ground. Ferguson is covered in blood. Going into the fight with Chiesa, Pettis was on the brink of possibly sliding out of the top ten with a loss and had a 2-5 record since 2015. His output rate is far higher here, but Pettis is still risky when he fires back. If he is able to get in-and-out effectively then it will force Ferguson to take more chances to close the distance and open himself up for Pettis' attacks.