Sawada vs. Nikolakakos Set for Vacant ONE Atomweight Title

A grappling collision between Japan’s most decorated female wrestler and an undefeated Canadian Brazilian Jiu-Jitsu black belt will determine the next ONE Women’s Atomweight MMA World Champion on December 2.

Chihiro Sawada and Anastasia Nikolakakos meet at Yokohama Buntai in Yokohama, Japan, during ONE SAMURAI 6. The five-round bout tops a card that marks the promotion’s continued expansion of its localized Japanese event series, which debuted earlier this year to capitalize on the country’s deep combat sports infrastructure.

The atomweight division — contested at 105 to 115 pounds under ONE Championship rules, significantly lighter than the UFC’s 115-pound strawweight minimum — has been vacant since former champion Stamp Fairtex moved up in weight following her historic 2024 run. Stamp became the first fighter to hold world titles in both mixed martial arts and Muay Thai simultaneously before vacating the MMA belt to pursue larger divisions, leaving the 26-pound championship open.

Sawada enters the title fight carrying a 12-1 record built almost entirely on elite mat wrestling. Before signing with ONE Championship, the 28-year-old captured the Shooto Atomweight Championship, emerging from a Japanese developmental circuit that has historically produced some of Asia’s most technically sound mixed martial artists. Her transition to the global stage began with three consecutive victories over Sanaz Fayazmanesh, Jihin Radzuan, and Noelle Grandjean.

A loss in January 2025 briefly stalled that momentum. Sawada responded by stringing together four straight wins, finishing two of them with first-round armbars against Macarena Aragon and Ayaka Miura. A unanimous decision over Itsuki Hirata and a victory that handed previously unbeaten Natalie Salcedo her first career defeat secured her position as the top contender.

If Sawada wins, she becomes the first Japanese woman to capture a ONE Championship world title in mixed martial arts. Japan dominated early women’s MMA through organizations like Smackgirl and Valkyrie in the 2000s, but Southeast Asian promotions have controlled the sport’s highest levels over the past decade.

Nikolakakos arrives in Yokohama with a 7-0 record and a fundamentally different approach to ground fighting. Where Sawada relies on wrestling takedowns and positional dominance, the 36-year-old Toronto resident uses Brazilian Jiu-Jitsu to control opponents before deploying heavy striking from top position.

Her promotional debut demonstrated that hybrid style. Nikolakakos took Victoria Souza down, advanced to mount, and finished the fight with punches just one second before the first round expired. Her second appearance required more tactical endurance. At ONE Fight Night 45 in July, she used early grappling to exhaust Radzuan, surviving a late rally from the Malaysian veteran to earn a split decision.

That narrow victory in Bangkok convinced ONE Championship matchmakers that Nikolakakos had done enough to warrant a direct title shot despite having only two fights inside the promotion. The rapid elevation reflects the limited depth of the atomweight division globally, where a flawless record and dominant grappling credentials can fast-track a contender.

The stylistic overlap makes the matchup unusual. Both fighters prefer the canvas, but they operate from different disciplines. Sawada holds five career submission victories and will attempt to dictate where the grappling exchanges occur. Nikolakakos will look to pull the fight into guard or half-guard scenarios where her black belt pedigree creates finishing opportunities that pure wrestling cannot neutralize.

ONE SAMURAI 6 represents the sixth installment of the promotion’s Japan-specific event series, staged exclusively for regional broadcast and local audiences rather than the standard global Prime Video cards. Additional matchups for the Yokohama Buntai card are still being finalized by ONE Championship matchmakers.