Tawanchai, Liu, Nattawut, More Added To ONE Friday Fights 137, ONE Championship’s Stack Final Card Of 2025

The world's largest martial arts organization is finishing 2025 in spectacular fashion, as ONE Friday Fights 137 returns to Bangkok's legendary Lumpinee Stadium on December 19. The year-ending showcase features an extraordinary lineup of star power and high-stakes matchups, headlined by reigning ONE Featherweight Muay Thai World Champion Tawanchai PK Saenchai making his return to kickboxing against dangerous Chinese striker Liu "Spirit Dragon" Mengyang. The stacked card also includes former ONE World Title challenger ‘Smokin’ Jo Nattawut going toe-to-toe with surging Iranian finisher Mohammad Siasarani, alongside multiple battles between elite competitors who are looking to win a US$100,000 contract before Christmas!

World Champion Tawanchai Faces Dangerous Chinese Challenger Liu

The main event delivers the highly anticipated featherweight kickboxing showdown between Tawanchai PK Saenchai and Liu "Spirit Dragon" Mengyang that fans have been waiting months to witness. This clash was originally scheduled for ONE Friday Fights 126 in September, but an injury forced the Thai megastar to withdraw at the last moment. Liu didn't let the opportunity go to waste, instead facing Shadow Singha Mawynn and producing an impressive performance where he dropped the decorated Thai fighter en route to a unanimous decision victory.

That statement win only increased anticipation for this rescheduled matchup with Tawanchai, who returns to kickboxing with his two-sport ambitions firmly intact. The reigning ONE Featherweight Muay Thai World Champion, who owns victories over stars like Superbon and Davit Kiria, is eager to get back in the title picture after falling to Masaaki Noiri for the interim featherweight kickboxing belt in March.

Meanwhile, Liu, who defeated Noiri in his promotional debut in December 2024, enters this contest with momentum and the confidence of knowing he can compete with Thailand's best, making this a legitimate test of Tawanchai's kickboxing credentials.

‘Smokin’ Jo Braces For Career-Defining Test

Nattawut, a former two-time ONE Featherweight Muay Thai World Title challenger and currently the division’s #5-ranked contender, returns to action in a pivotal matchup against red-hot Iranian striker Mohammad Siasarani, who brings a dangerous three-bout winning streak into this high-stakes encounter.

Nattawut once rode his own four-bout surge that established him as a perennial contender, but he now searches for the form that made him such a feared competitor. A victory over the surging 23-year-old Siasarani could thrust the Thai veteran back into legitimate ONE World Title conversation, but a loss would certainly push him out of the top-five rankings. It’s especially crucial for the Thai powerhouse, as he previously mentioned that he is entering the twilight of his career, so a win could lead him to one final title run.

Siasarani represents everything dangerous about a young fighter on the rise – hungry, confident, and riding the momentum of consecutive victories that have captured attention throughout the organization. The Iranian striker has systematically dismantled opponents during his recent run, showcasing the finishing ability and technical improvement that suggests he's ready for this step up in competition. With victories over the likes of the aforementioned Liu and the legendary Sitthichai Sitsongpeenong, this matchup against a ranked opponent like Nattawut gives him the opportunity to prove he belongs among the division's elite while moving closer to earning that life-changing main roster contract.

Here is the card so far for ONE Friday Fights 137.