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.

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.

Arman Tsarukyan's nearly six-year journey to the UFC lightweight title will take a little longer. Tsarukyan suffered an injury two nights before challenging lightweight champion Islam Makhachev at UFC 311.

Arman Tsarukyan claims he is chasing legacy until he wins the title from Islam Makhachev, not money, and fans have mixed reactions.

It's not the matchup we expected, but Islam Makhachev and Renato Moicano are set to fight with undisputed UFC gold at stake. Their lightweight title bout scheduled for five rounds is taking place Saturday,

Islam Makhachev's fourth UFC lightweight title defense now looks a lot different than what he was preparing for. And yet, that's no problem for the champion. Makhachev (26-1 MMA, 15-1 UFC) was preparing for months to defend his belt against Arman Tsarukyan in the main

The UFC 311 start time and TV schedule is for the Islam Makhachev vs. Renato Moicano UFC lightweight championship event at Intuit Dome in Los Angeles, Calif., on Saturday night is below. The fight card is broken into three different parts and airs on multiple mediums.

Islam Makhachev defends the lightweight title against Renato Moicano, who steps in for the injured Arman Tsarukyan on one day’s notice