Keiichiro Matsui

is a Japanese badminton player. He is a former member of the Japanese national team. Previously affiliated with the Hitachi team, Matsui officially joined the AC Nagano Parceiro Badminton Club in March 2026. Born in Ishikawa, he graduated from the Tomioka senior high school, and later educated at the Nippon Sport Science University. He was part of the national junior team that won the gold medal at the 2012 Asian Junior Championships, and the silver medal at the 2012 World Junior Championships.

Career 2026 Matsui formed a new men's doubles partnership with Kenya Mitsuhashi. In June, they made their debut at the U.S. Open, where they reached the quarterfinals.

Achievements BWF World Tour (1 runner-up) The BWF World Tour, which was announced on 19 March 2017 and implemented in 2018, is a series of elite badminton tournaments sanctioned by the Badminton World Federation (BWF). The BWF World Tour is divided into levels of World Tour Finals, Super 1000, Super 750, Super 500, Super 300 (part of the HSBC World Tour), and the BWF Tour Super 100.

Men's doubles Year Tournament Level Partner Opponent Score Result Ref 2019 Russian Open Super 100 Yoshinori Takeuchi Mathias Boe Mads Conrad-Petersen 18–21, 13–21 Runner-up

BWF Grand Prix (1 runner-up) The BWF Grand Prix had two levels, the Grand Prix and Grand Prix Gold. It was a series of badminton tournaments sanctioned by the Badminton World Federation (BWF) and played between 2007 and 2017.

Mixed doubles Year Tournament Partner Opponent Score Result Ref 2017 Russian Open Akane Araki Chan Peng Soon Cheah Yee See 8–11, 13–11, 3–11 Runner-up BWF Grand Prix tournament

BWF International Challenge/Series (3 titles, 1 runner-up) Men's doubles Year Tournament Partner Opponent Score Result Ref 2017 Spanish International Yoshinori Takeuchi Jacco Arends Ruben Jille 17–21, 19–21 Runner-up 2019 Maldives International Yoshinori Takeuchi Arun George Sanyam Shukla 21–9, 22–20 Winner 2019 Dubai International Yoshinori Takeuchi Shia Chun Kang Tan Boon Heong 21–14, 21–14 Winner 2025 Malaysia International Katsuki Tamate Muhammad Faiq Lok Hong Quan 15–7, 15–13 Winner BWF International Challenge tournament