Basically since Khabib retired, the Lightweight belt is now vacant. Dustin Poirer is looked at as the most deserving for the title, but he declined a fight for the title so he could fight McGregor for a third time. The number one/two contender is Oliviera, who is on an 8-fight win streak, he's been super dominant in the division. Chandler has come in from another organisation where he was champion, he beat a T8 contender in the first round with ease in his UFC debut so he was an easy lock-in for this title fight, seeing as Justin Gaethje lost his last fight, though people weren't happy with him getting a title shot so soon after joining the UFC. Winner of this fight will fight the winner of McGregor vs. Poirer 3.