Cormier landed another takedown and eventually sunk in a rear-naked choke, forcing Lewis to tap at the 2:14 mark.
And why not? This will not go down as one of the best UFC headliners this year, but Cormier will go down as one of the best fighters ever, and there's no question he's on borrowed time.
There was a decent amount of hype heading into this one but when the octagon doors closed, it became evident very quickly that the gap in skill between these two would be too vast for Lewis to conquer.
"Brock Lesnar, when you come, bring that brand new WWE title because I feel like being the WWE champion, too", Cormier said. Oh boy, look at that!
CBS Sports was with you for every punch, kick and submission attempt from Madison Square Garden with our live blog below.More news: News On WWE Having Hulk Hogan Make Return At Crown Jewel PPV
Cormier beat Anthony Johnson in 2015 to win the light heavyweight title and defended it against the likes of Alexander Gustafsson and Volkan Oezdemir. Cormier executed multiple takedowns, buried "The Black Beast" with suffocating top control and tore into him with short bursts of punishing ground-and-pound. "Unfortunately, he's like 40 years old, and you can't keep doing this much longer if you're Daniel Cormier". Cormier will be stripped of his light heavyweight title and the 205-pound crown will go to the victor of the Jon Jones-Alexander Gustafsson bout at UFC 232 on December 29 in Las Vegas.
At the end of the day, Cormier is the favourite for a reason and if Lewis wins Saturday night it will go down as one of the biggest upsets in UFC history.
Lesnar, the former UFC heavyweight champion and current WWE superstar, has consistently been one of the five biggest draws in the history of MMA, and there was already heat building for a showdown with Cormier after they had an in-cage altercation back at UFC 226 in July.
We'll see if Cormier does, in fact, retire in March - but it does seem as if everyone around him genuinely hopes he will. Coaches, managers, teammates - even UFC president Dana White, who knows how valuable Cormier is as an active fighter - can't deny it makes sense.
Lewis served 3½ years in prison in his early 20s stemming from a parole violation when he was charged with aggrevated assault shortly after high school.
You never know how one thing can change another in time and there's always the possibility that you might never expect how different things could have been if things would have been different. "We're the two greatest fighters of all time and we fight each other".