Former Japan Judo Representative Kosuke Masuyama Acquires Mongolian Citizenship to Target Olympic Gold

Mashiyama, a 27-year-old former member of the Japanese national judo team, shared a photograph of a custom black belt bearing his name alongside a statement titled “An unprecedented challenge to become the world’s best.” According to his public statement, the decision stems from relationships built during his student years and discussions with the Mongolian Judo Federation.

“I was born in Japan to Japanese parents and raised by Japanese judo,” Mashiyama wrote in his announcement. “Without the instructors, teammates, and everyone who has supported me, I would not be who I am today. That is why this decision is about carrying everything I cultivated in Japan and taking on a challenge on the global stage.”

The Roots of an Unprecedented Decision

He joined Park24 in 2021 and subsequently earned selection for Japan's team at the 2021 and 2022 World Championships in the team competition.

While Mashiyama does not possess Mongolian ancestry, he explained that continuous connections forged during his academic years opened the door to a new competitive pathway. After meeting with officials from the Mongolian Judo Federation in person and evaluating their commitment to his athletic development, he committed to the environment.

“This decision is based on a desire to become a world champion and an Olympic champion,” Mashiyama stated. “Because there is no precedent, this challenge has true value. Through this endeavor, I will reach the summit of the world.”

Timeline and International Eligibility

Under International Judo Federation regulations, Mashiyama will not be eligible to represent Mongolia in official international tournaments until April of next year.

The transition marks a shift for a judoka who has previously represented Japan at the senior world championship level. By shifting his competitive allegiance to Mongolia, Mashiyama aims to secure a route to future Games.

Further updates on Mashiyama’s competitive debut under the Mongolian flag are expected following the clearance of International Judo Federation registration protocols ahead of the spring circuit.