All of ONE Championship's double world champions so far

#2. Sam-A Gaiyanghadao - Muay Thai legend conquers kickboxing

After competing in over 400 bouts in Muay Thai, Sam-A Gaiyanghadao was already a legend of the sport when he arrived in ONE Championship.

He won the ONE flyweight Muay Thai world title in 2018 but lost the title in his first world title defense. It pushed him to move down to his natural weight class, where he was able to unleash his skills even better.

In 2019, he switched sports to compete for the inaugural ONE strawweight kickboxing world title against Wang Junguang. The Thai icon utilized his skills to conquer a world title in a second sport.

Three months later, Sam-A returned to his original sport to battle Josh Tonna for the inaugural ONE strawweight Muay Thai world title. His masterclass against the Aussie striker brought him a second world title in the division, his third overall in the promotion.

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#1. Reinier de Ridder - Reigning ONE middleweight and light heavyweight world champion

The undefeated Reinier de Ridder is the latest and the only reigning champ-champ in ONE Championship.

Reiniert de Ridder arrived in ONE Championship with nine wins under his belt and no losses. He proved that he can compete with the best in the world, collecting three straight wins in the circle to earn a shot at the ONE middleweight world title.

He shocked the world in 2020 by ending Aung La N Sang’s dominant seven-bout winning streak with a first-round submission victory. Six months later, he went up against Aung La once again, this time for the ONE light heavyweight world title. He needed all five rounds to conquer Myanmar’s hero, but he successfully joined the elite club of double champions in the promotion.

At ONE 159, de Ridder will look to keep his status as a reigning two-division champion when he takes on Vitaly Bigdash in the main event of the July 22 event.