WATCH: Ok Rae Yoon upsets Christian Lee to win ONE lightweight MMA belt in 2021

Former ONE lightweight MMA world champion Ok Rae Yoon of South Korea is a bit of an overachiever. The fights he was never supposed to win, he used as an opportunity to shock the world and win them.

Such was the case against opponents Marat Gafurov, Eddie Alvarez, and perhaps most significant of all -- two-division ONE world champ 'The Warrior' Christian Lee.

Ok first met Lee in September of 2021 at ONE: Revolution, where he delivered a clinical striking performance to upset 'The Warrior' by unanimous decision and claim the lightweight MMA gold.

Check out highlights from that first fight in the YouTube video below.

Former lightweight MMA world champ Ok Rae Yoon of South Korea is set to lock horns against unbeaten Turkish stalwart Alibeg Rasulov for the ONE interim lightweight MMA world title.

The two will fight at ONE Fight Night 23: Ok vs. Rasulov on Prime Video, which broadcasts live from the iconic Lumpinee Boxing Stadium in Bangkok.

Fans in the United States and Canada can catch all the action live and absolutely free on Amazon Prime Video beginning at 8:00 p.m. ET on Friday, July 5th.

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Ok Rae Yoon to use victory over Alibeg Rasulov to earn rematch with Christian Lee: "I need a good reason"

Former lightweight MMA king Ok Rae Yoon wants to make a case for a trilogy showdown with rival Christian Lee, and he has redemption on his mind.

The 33-year-old fight veteran believes a win over undefeated Alibeg Rasulov could give him the opening he needs to secure another meeting with Lee.

He told ONE Championship:

"For that to happen, I need a good reason, and that would be defeating a 14-0 fighter in Alibeg. I am studying Alibeg closely and preparing for him accordingly. So, I’ve been working on my takedown and grappling defense, as well as my overall striking."