The undefeated grappling sensation, Kade Ruotolo, puts his perfect MMA record on the line against South Korean veteran Rae Yoon Ok on December 18 in Bangkok.
Kade Ruotolo’s rapid rise in mixed martial arts is about to face its toughest challenge yet.
The undefeated American submission grappling star will meet former ONE Lightweight MMA World Champion Rae Yoon Ok at ONE Fight Night 50 on December 18, 2026, at Lumpinee Stadium in Bangkok, Thailand.
For Ruotolo, the matchup represents a significant step up in competition as he continues his transition from elite submission grappling to professional MMA. For Ok, it offers an opportunity to halt a difficult stretch and reestablish himself among the lightweight division’s leading contenders.
The matchup brings together two fighters at very different stages of their MMA careers: a 23-year-old rising star with a perfect finishing record and a seasoned South Korean former champion looking to prove he remains a threat to the division’s best.
Ruotolo’s Perfect Start Faces a Championship-Level Test
Kade Ruotolo has made an impressive transition into mixed martial arts, compiling a 4-0 professional record with four finishes, including three submissions and one knockout.
Already established as one of the world’s premier submission grapplers, Ruotolo entered MMA with an exceptional foundation. The youngest ADCC world champion in history and ONE Lightweight Submission Grappling World Champion has demonstrated that his grappling expertise translates effectively into MMA competition.
What has made his development particularly interesting, however, is his willingness to embrace striking.
Rather than relying exclusively on takedowns and submissions, Ruotolo has shown increasing confidence exchanging punches and creating opportunities through aggressive forward pressure.
His most recent victory over Japanese veteran Hiroyuki Tetsuka further demonstrated that evolution. Ruotolo secured a second-round knockout with a right hand and follow-up ground strikes, adding another dimension to his growing MMA résumé.
But Ok presents a different challenge.
Unlike Ruotolo’s previous opponents, the South Korean has competed against some of ONE Championship’s most accomplished lightweights and knows what it takes to win at the championship level.
Rae Yoon Ok Looks to Reclaim His Position
At 17-6, Ok enters the matchup with a considerable advantage in professional MMA experience.
The South Korean veteran rose to prominence through victories over former UFC lightweight champion Eddie Alvarez and longtime ONE standout Christian Lee.
His victory over Lee in September 2021 earned him the ONE Lightweight MMA World Championship and established him as one of South Korea’s most accomplished fighters competing internationally.
However, recent results have been less favorable.
Rae Yoon Ok has suffered consecutive decision defeats against Alibeg Rasulov and Lucas Gabriel, leaving him searching for a victory that could restore his momentum.
Despite those setbacks, Ok remains a dangerous opponent.
His strengths lie in his technical boxing, counter-striking, distance management, and ability to compete through prolonged exchanges. Having already experienced five-round championship competition, Ok also brings a level of composure that Ruotolo has yet to be forced to demonstrate over an extended MMA contest.
Against a younger opponent known for explosive starts and aggressive finishing instincts, that experience could become an important factor.
The Tactical Battle: Grappling Against Experience
The most compelling element of this matchup is how Ruotolo’s world-class grappling will interact with Ok’s striking experience and defensive discipline.
Kade Ruotolo is particularly dangerous when he can close distance, initiate scrambles, and transition rapidly between submission attempts. His ability to attack from unconventional positions makes him difficult to prepare for, even for experienced MMA fighters.
Ok’s primary objective will likely be to keep the fight standing and prevent Ruotolo from establishing prolonged grappling exchanges.
The South Korean has traditionally been most effective when controlling range, using combinations, and countering opponents who enter recklessly.
If Ok can maintain lateral movement, defend initial takedown attempts, and force Ruotolo into extended striking exchanges, he could expose weaknesses in the American’s still-developing stand-up game.
Conversely, Ruotolo’s relentless submission threats could force Ok into defensive positions where his striking advantage becomes irrelevant.
The opening round may reveal which fighter can dictate where the contest takes place.
A Defining Opportunity for Both Fighters
For Ruotolo, defeating a former ONE world champion would represent the strongest evidence yet that he is developing into a legitimate lightweight MMA contender.
His perfect finishing record has generated considerable excitement, but overcoming an opponent with Ok’s championship experience would carry significantly greater weight than his previous victories.
For Ok, the stakes are equally important.
At this stage of his career, another defeat would extend his losing streak to three fights and further complicate his path back toward championship contention.
A victory, however, would remind the lightweight division that his experience, striking fundamentals, and championship pedigree remain relevant against the sport’s emerging talents.
The matchup also carries significance for South Korean MMA. Ok has been one of the country’s recognizable representatives on ONE Championship’s international stage, and a victory over a rising American star would provide an important boost following his recent setbacks.
Can Ruotolo Maintain His Perfect Record?
Kade Ruotolo enters the contest with momentum, youth, and one of the most dangerous submission games in the division.
Ok counters with experience, technical striking, and the composure developed through years of competing against elite opposition.
The American’s clearest route to victory is to establish pressure early, force grappling exchanges, and capitalize on opportunities to attack submissions.
Ok’s best chance may be to extend the fight, maintain distance, and make Ruotolo demonstrate whether his striking and defensive awareness can hold up against a former champion.
With contrasting styles and significant implications for both careers, their December 18 meeting promises to be one of the more intriguing lightweight matchups on the ONE Fight Night 50 card.
For Ruotolo, it is an opportunity to move closer to MMA title contention. For Rae Yoon Ok, it is a chance to prove that the next generation still has work to do before replacing the old guard.
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