In the main event, middleweight champion Robert Whittaker (20-4 MMA, 11-2 UFC) puts his title up against challenger Kelvin Gastelum (15-3 MMA, 10-3 UFC).
UFC president Dana White confirmed today in a press conference in Melbourne that the stipulations are the same for Kiwi fighter Israel Adesanya, that he will have a shot at the title if he beats Anderson Silva on Sunday.
In a later statement, UFC said Whittaker had undergone emergency surgery due to a "severe abdominal injury". "It wasn't a weight-cutting related issue or anything like that, it's just a very unfortunate hernia issue which may even require a procedure".
Evidently, Whittaker began complaining of pain in his abdomen during the middle of the night and was taken to the hospital.
With next to no time to find a replacement for Whittaker all the way out in Australia, UFC 234 turned to its old superstar in Silva to headline the event.
Elevated to the co-main is the lightweight matchup between Albuquerque action hero Lando Vannata and surging Brazilian Marcos Mariano.
Whittaker, fresh off winning the middleweight belt, had been scheduled to mount his first title defense in February 2018 against Luke Rockhold at UFC 221 in Perth, Australia.
Your MW main event & a WAR in the making! Adesanya, who fights out of New Zealand, is one of the UFC's most promising prospects, taking on an all-time great in Silva.