"Obviously I've got to go do my thing. I'm focused 100% on Yair, but obviously, I want that rematch," Volk told TMZ Sports.

"Then you've got guys like Ilia's [Topuria] name gets thrown out there, and whoever it is I'm gonna turn up cause I wanna be active, that's that. It's pretty simple with me. Ya know people aren't gonna be waiting long, but it just depends on who the UFC wants, but obviously I want that rematch."

Of course, Alex and Islam fought at UFC 284 in February, a fight AV lost by unanimous decision. However, that doesn't exactly tell the full story ... many fans felt Volkanovski actually won the fight, and should've been double champ.

First things first, Alex, who is a sizeable favorite (around -380), has to beat Yair if he wants to be double champ. On the other side of things is Rodriguez ... who won the interim title in a fight with Josh Emmett (also at UFC 284).

Yair, like Alex, badly wants this win ... and says he's ready to go to extreme lengths.

"I accept anything that comes with [the fight]. I understand the sport and more than being prepared to win this fight, I'm ready to f****** die, and that's one of the things you've got to be prepared for every time that you step in the cage," Rodriguez says.

"Many people go in there only thinking I'm winning, I'm winning. I go in there with many fears, but also I beat my fears every single day. So I'm ready to die."

There's more -- we also talked to the men scrapping in the co-main event, Brandon Moreno and Alexandre Pantoja, who are fighting for a third time.

Pantoja, the #2 ranked contender, beat the flyweight champion twice ... but those fights were years ago.

Moreno says he's out to prove ... a lot has happened since 2018.