Dustin Poirier is aiming to complete a hugely successful 2021 by becoming the UFC's lightweight champion this weekend.
The Diamond has defeated Conor McGregor twice this year and faces Oliveira in Las Vegas as he finally hopes to get his hands on the belt.
Poirier was crowned the interim champion in 2019 when Khabib Nurmagomedov was serving a suspension, but lost to the Russian a few months later.
The American has beaten some of the biggest names in the division though and few could begrudge him becoming champion.
It's a stacked card, with Amanda Nunes defending her women's bantamweight title against Julianna Pena prior to the main event.
Here's everything you need to know:
Where and when is it?
The event takes place at The T Mobile Arena in Las Vegas from Saturday night well into the early hours of Sunday morning, Irish time.
What time does it start at?
The early prelims start at 11pm, with the prelims commencing at 1am before the main card at 3am.
The main event is expected to start around 5am.
What channel is it on?
BT Sport 2 will show the action live.
You can also follow updates with The Irish Mirror's live blog.
Betting odds
Charlies Oliveira win: 11/10
Dustin Poirier win: 8/11
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