UFC Hall of Famer Khabib Nurmagomedov knows a thing or two about last-minute opponent changes. Nurmagomedov, one of the best former lightweight champions in the sport, has become an incredible coach.

Arman Tsarukyan has been forced out of the main event at UFC 311, with Brazil's Renato Moicano stepping in to challenge Islam Makhachev on one day's notice.

As Jailton Almeida looks to reestablish himself as a future title contender at heavyweight, Serghei Spivac is a good matchup for UFC 311's new pay-per-view opener, but also a dangerous one like Barcelos is for Talbott.

An injured Arman Tsarukyan has been replaced in the main event of UFC 311, with Renato Moicano now challenging Islam Makhachev for the lightweight title – on one day’s notice.

Dana White confirms Arman Tsarukyan's withdrawal due to a back injury; Islam Makhachev now faces Renato Moicano at UFC 311.

With the tumultuous morning weigh-ins now in the books, the UFC 311 ceremonial weigh-in ceremony and fighter faceoffs are set to go down tonight in Los Angeles.

Can Moicano defeat all odds and become champ? Check the UFC odds series for our Makhachev-Moicano prediction and pick.

Islam Makhachev will now defend his title against Renato Moicano, following the withdrawal of original challenger Arman Tsarukyan due to a back injury.

As a result of Tsarukyan's dropout, lightweight contender Renato Moicano is stepping into the main to challenge Makhachev for the 155-pound title on short notice. Moicano was previously scheduled to face fellow veteran contender Beneil Dariush on the pay-per-view card.

The first big Ultimate Fighting Championship show of the year has just taken a monumental hit. During the UFC 311 early weigh-ins on Friday, Sherdog learned from sources close to the situation that headlining lightweight title challenger Arman Tsarukyan suffered a back injury.

This comes after Arman Tsarukyan withdrew from a championship rematch at the last minute due to a back injury. Meanwhile, the co-main event will see Merab Dvalishvili look to make his first title defense against the undefeated Umar Nurmagomedov.