UFC's Sean O'Malley Says Cody Garbrandt Fight Will '100% Happen'

Sugar vs. No Love!?!

UFC rising star Sean O'Malley tells TMZ Sports that's a fight that will "100% happen" -- even if it takes a few years to get there.

Of course, Sean and Cody both fought at UFC 250 on Saturday -- and KO'd their opponents with unbelievable 1-hitter quitters!

They each got a $50k performance bonus -- and now, the hype to get these guys into the Octagon TOGETHER has begun.

"He's a dangerous fight, for sure," O'Malley tells us ... "Anyone that throws a right hand like that is dangerous."

"We'll fight someday. 100% fight someday. He's still pretty young so I think that's gonna be a potential big, BIG fight, that's a big pay-per-view fight here in the next years."

"He keeps winning, I keep winning. That's a big f**king fight."

O'Malley says he's got tons of respect for Garbrandt after he came back from a 3-fight skid to KO Raphael Assuncao ... but he did notice one interesting change about Cody's look.

"Grew his beard out a little bit, try to add maybe a little cushion there and it might have worked -- but I'll slice right through that f**king beard!"

As for Sean's killer KO of Eddie Wineland -- "Sugar" breaks down the punch that ended the fight ... and it's awesome.