Kosei Yoshida

Hailing from Fukuoka, Japan, Kosei Yoshida is a gifted kickboxer who has brought slick movement, sharp counters, and crisp combinations to ONE Championship’s flyweight division.

The Team Teppen athlete’s path to the global stage began with a childhood fascination with martial arts.

Inspired by the anime Dragon Ball, Yoshida took up karate when he was just 5 years old. His brother also practiced the discipline, but Yoshida soon became more interested in kickboxing. He switched sports a year later, drawn to its action and the opportunity to develop a wider range of strikes.

The Fukuoka native threw himself into competition, gaining valuable experience across approximately 60 junior and amateur bouts and winning a regional tournament. Those formative years helped him develop his timing, coordination, and ability to read opponents – qualities that would become hallmarks of his fighting style.

Yoshida made his professional debut at 16 and announced himself to the kickboxing scene with a knockout. He later joined the renowned Team Teppen gym in Chiba, Japan, where training alongside other talented strikers helped him refine his evasive footwork, lightning-fast entries, and fluid punching combinations.

After testing his skills in Japan’s RISE organization, Yoshida earned a chance to compete on the global stage with ONE Championship in September 2025. He immediately made an impression by defeating Indonesian kickboxer Tovan Nopian in his promotional debut.

The Japanese rising star followed that success with three more victories over international opposition, including a memorable knockout that showcased his growing confidence and finishing instincts. That early run demonstrated how effectively his speed and technical approach could translate against a wide variety of opponents.

After encountering his first setback in ONE Championship, the Japanese striker responded with an impressive victory at ONE SAMURAI 3 in September 2026. The result underlined his ability to regroup, keep improving, and deliver against challenging competition on a major stage.

With his agility, quick hands, and expanding offensive arsenal, Yoshida remains focused on his development at Team Teppen. His next ambition is to secure the life-changing US$100,000 ONE Championship contract and a permanent place among the promotion’s global roster of elite athletes.