Rae Yoon Ok is one of the most accomplished Korean mixed martial artists of his generation and a former ONE Lightweight World Champion.

Representing Busan Team MAD, Ok rose through the Asian regional scene by capturing championships in HEAT and Double G FC before signing with ONE Championship. His victories over former world champions Marat Gafurov, Eddie Alvarez, and Christian Lee established him as one of South Korea’s premier international fighters and one of the country’s greatest lightweight competitors.

Rae Yoon Ok was born in Busan, South Korea, and began his professional mixed martial arts career in 2014. After gaining experience in South Korea and China, he emerged as one of Asia’s top lightweight prospects through successful runs in Wu Lin Feng, HEAT, and Double G FC. Under the guidance of Busan Team MAD head coach Sung Hoon Yang, he developed into a complete mixed martial artist capable of competing with the world’s elite.

Rae Yoon Ok has earned professional victories by knockout, but his greatest strength on the feet is his disciplined boxing and ability to manage distance over extended fights. Rather than relying solely on power, he uses pressure, timing, and clean combinations to consistently outscore opponents. Victories over Eddie Alvarez and Christian Lee demonstrated his ability to maintain a high pace against elite competition over five rounds.

Grappling

Although known primarily for his striking, Rae Yoon Ok possesses a well-rounded grappling game. His professional résumé includes submission victories, most notably a rear-naked choke finish over Burenzorig Batmunkh. Throughout his championship run, he also displayed excellent takedown defense and composure against accomplished grapplers such as Marat Gafurov.

Fight IQ

Fight IQ has been one of the defining strengths of Rae Yoon Ok’s career. His victories over former world champions came through disciplined execution rather than reckless aggression. He consistently manages range, conserves energy, and adapts effectively over championship-length contests, allowing him to compete successfully against world-class opposition.

Rae Yoon Ok turned professional in 2014, competing in promotions including Wu Lin Feng, HEAT, and Double G FC. He captured the HEAT Lightweight Championship, successfully defended the title, and later won the Double G FC Lightweight Championship by defeating Ki Won Bin. Those accomplishments established him as one of Asia’s leading lightweights before signing with ONE Championship.

His breakthrough came in 2021. Within one week, Ok defeated former ONE Featherweight World Champion Marat Gafurov and former UFC Lightweight Champion Eddie Alvarez, earning the nickname “Legend Killer.” Those victories secured a title shot against reigning ONE Lightweight World Champion Christian Lee at ONE: Revolution. Rae Yoon Ok won a unanimous decision to capture the world championship, becoming the first South Korean to win a ONE Lightweight World Title. The decision was controversial, but ONE Championship upheld the official result following a review.

Rae Yoon Ok defended his status as one of ONE’s top lightweights before losing the championship in a rematch with Christian Lee at ONE 160 in 2022. He rebounded with a unanimous decision victory over Lowen Tynanes at ONE Fight Night 10 before challenging Alibeg Rasulov for the interim ONE Lightweight World Championship at ONE Fight Night 23 in July 2024. Although he lost by unanimous decision, the bout reaffirmed his position among the organization’s elite lightweight contenders.

• Former ONE Lightweight World Champion.
• Former HEAT Lightweight Champion.
• Former Double G FC Lightweight Champion.
• HEAT Lightweight Tournament Champion.
• ONE Championship 2021 Male MMA Fighter of the Year.
• Victories over Christian Lee, Eddie Alvarez, Marat Gafurov, and Lowen Tynanes.

Rae Yoon Ok has established himself as one of the greatest Korean fighters of the modern era. His rise from the Korean regional circuit to becoming a ONE world champion represents one of the most successful international careers by any Korean mixed martial artist. His championship accomplishments, elite résumé, and continued competitiveness at the highest level have secured his legacy among South Korea’s all-time greats.