Ed Mulholland-USA TODAY Sports

A champion who is encroaching upon record territory makes his next title defense in the main event of Saturday night's UFC 278.

Kamaru "The Nigerian Nightmare" Usman (20-1) puts his welterweight title on the line against England's Leon Edwards (19-3) in the featured bout at Vivint Arena in Salt Lake City, Utah.

The Ft. Lauderdale, Fla. resident by way of Nigeria will look to make his sixth successful defense of a crown he won in 2019. Usman, considered by some MMA's current top pound-for-pound fighter, is undefeated since joining UFC in 2015, winning each of his first 15 fights. With a victory over Edwards, he'd tie legendary former UFC middleweight titleholder Anderson Silva for the longest win streak in UFC history.

Standing in his way is Manchester's Edwards. This is a rematch of a bout first run in 2015. Usman, in his second UFC appearance, took a unanimous decision in a matchup that was deep in the prelim cards. That stands as Edwards' last loss to date, as he's won nine consecutive bouts since, easily outpointing Nate Diaz last time out at UFC 263.

Heading into the fight, Edwards chattered as if he, and not Usman, won the fast fight.

"All this pound-for-pound talk, I don't see it," Edwards said at UFC 278 media day. "I don't see it in his fights, I don't see it in his techniques. He's a very good fighter, he has improved."

The second and third-billed bouts on the evening feature a pair of former UFC champions.

At middleweight, former champion Luke Rockhold (16-5) of Northern California takes on Brazil's Paulo Costa. It's been rough sledding for both in recent outings. Rockhold has been knocked out three times in four fights dating back to losing the title to Michael Bisping in 2016. Costa (13-2) has lost his past two and hasn't won since 2019.

At bantamweight, former longtime featherweight champion Jose Aldo's 135-pound renaissance continues when he meets Merab Dvalishvili. Brazil's Aldo (31-7) has won three straight, while Dvalishvili (14-4), from the republic of Georgia, has won seven straight.

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