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ONE Championship is the largest combat sports organization in Asia and the world’s most prominent promotion for MMA, Muay Thai, and kickboxing conducted simultaneously under one brand. Founded in Singapore in 2011, ONE has grown into a global sports media company with events across Southeast Asia, China, Japan, and the United States, attracting both elite Asian fighters and Western champions seeking the organization’s unique platform.

What Is ONE Championship?

ONE Championship (often called simply “ONE” or “ONE FC”) is a Singapore-based combat sports promotion that operates across three disciplines: MMA (mixed martial arts), Muay Thai, and kickboxing. Unlike the UFC, which focuses exclusively on MMA, ONE presents all three sports on the same cards, creating a format that appeals to fans of multiple combat disciplines and reflects the diverse fighting traditions of its Asian home market.

The organization is led by CEO Chatri Sityodtong, a Thai entrepreneur whose vision was to create a Pan-Asian sporting brand that could compete with Western sports leagues for global attention. ONE has secured partnerships with Amazon Prime Video, ESPN, and major Asian broadcasters, giving it significant distribution reach across multiple markets.

ONE’s Unique Rules and Format

ONE Championship’s MMA fights use a unique set of rules that differ significantly from the Unified Rules used by the UFC and most North American promotions. The most notable difference is the hydration testing protocol — ONE does not allow fighters to cut significant weight through dehydration. Fighters are tested the morning of the event and must be within a specified hydration range, which effectively means they compete closer to their natural walking-around weight.

This approach, while controversial, was adopted to address health concerns around extreme weight cutting — a practice that has resulted in fighter deaths and serious health incidents in other promotions. The result is that ONE’s weight classes often see fighters competing at weights that other promotions’ athletes would consider their cutting weight, potentially changing competitive dynamics within divisions.

Weight Classes

ONE Championship uses weight classes that don’t align perfectly with the UFC’s system, reflecting both the hydration rules and the Asian market’s typical weight distribution. The weight classes range from atomweight (105 lbs / 47.6 kg) through strawweight, flyweight, bantamweight, featherweight, lightweight, welterweight, middleweight, light heavyweight, and heavyweight. ONE also has a super heavyweight division for the sport’s largest competitors.

Muay Thai and Kickboxing Championships

ONE’s Muay Thai and kickboxing programs have attracted world-class fighters and produced some of the best striking competitions in the world. The organization’s Muay Thai championships are contested under traditional Thai rules, including elbows, and feature fighters from Thailand, Cambodia, and around the world competing at the highest level of the sport.

Rodtang Jitmuangnon, who holds ONE’s flyweight Muay Thai championship, has become one of the promotion’s biggest stars through his spectacular knockouts and willingness to engage in brawls. His crossover fight against Demetrious Johnson — a two-sport bout where each fighter competed in their discipline for one round — generated enormous attention as a unique combat sports concept.

Notable ONE Champions and Fighters

ONE has attracted significant talent including former UFC champion Demetrious Johnson (“Mighty Mouse”), who moved to ONE in 2018 and has competed in both MMA and the unique MMA-Muay Thai crossover format. Former UFC lightweight champion Eddie Alvarez spent time in ONE. Bibiano Fernandes held ONE’s bantamweight MMA title for over a decade, establishing himself as one of the sport’s most consistent champions outside the UFC.

The promotion has also developed significant Asian talent, particularly Thai Muay Thai champions and Chinese and Korean MMA fighters who might not have had a prominent platform in a UFC-centric model. This development of regional talent is central to ONE’s identity and differentiates it from the American-centric UFC model.

ONE vs. UFC: Different Models

Comparing ONE Championship and the UFC reveals two fundamentally different promotional models. The UFC operates primarily from an American base with a global roster competing under American promotion and American rule sets. ONE operates from an Asian base that reflects Asian markets, fighting traditions, and athletic talent pools, with unique rules designed to address health concerns.

The organizations have competed for some of the same fighters, but for most of ONE’s history the UFC has maintained significantly higher global name recognition and pay-per-view economics. ONE’s competitive advantage lies in its Asian market dominance, its multi-discipline format, and the authenticity it brings to Muay Thai and kickboxing as standalone disciplines rather than feeders to MMA.

Growth and Future

ONE Championship’s partnership with Amazon Prime Video for North American distribution represented a significant step toward Western market penetration. The organization continues to grow its content library, develop its fighter roster, and expand its footprint through events in the United States alongside its Asian base.

For combat sports fans who want to see world-class Muay Thai and kickboxing alongside MMA, ONE Championship represents essential viewing — a promotion that takes striking disciplines seriously as standalone sports and has produced some of the world’s best striking performances as a result.