Conor McGregor will get the opportunity to avenge his defeat to Nate Diaz after a rematch was confirmed for UFC 200.
Featherweight champion McGregor saw a 15-fight unbeaten streak ended by Diaz this month at UFC 196 after stepping up two divisions to fight at welterweight.
Diaz - who had just 11 days to prepare for the fight after Rafael Dos Anjos pulled out of his lightweight title bout with McGregor due to injury - secured a submission victory to inflict a first UFC defeat on McGregor.
The big-talking Irishman, who became the undisputed featherweight champion by knocking out Jose Aldo in 13 seconds last December, has another chance to prove himself at welterweight, though, when he and Diaz go at it again in Las Vegas on July 9.
UFC president Dana White says he and co-owner Lorenzo Fertitta attempted to convince McGregor to fight at a lower weight, but he was "obsessed" with avenging the loss.
"He was obsessed - obsessed with fighting Nate Diaz again," he told ESPN.
"Obviously, Lorenzo and I tried to argue with him and said 'let's go back to 145 and defend your title. Or if you really want the Diaz fight that bad, do it at 155.' He wants the fight at 170.
"Even his coach tried to get him to get off the rematch and off the 170-pound fight - but it's what he wanted."