Keiichiro Matsui (松居 圭一郎 Matsui Kei'ichirō, born 5 June 1994) is a Japanese badminton player who affiliated with the Hitachi team. 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.
|Born||5 June 1994|
|Height||1.69 m (5 ft 7 in)|
|Weight||64 kg (141 lb)|
|Men's & mixed doubles|
|Highest ranking||60 (MD 14 June 2018)|
214 (XD 5 April 2018)
BWF Grand PrixEdit
|2017||Russian Open||Akane Araki|| Chan Peng Soon
Cheah Yee See
|8–11, 13–11, 3–11||Runner-up|
BWF International Challenge/SeriesEdit
|2017||Spanish International||Yoshinori Takeuchi|| Jacco Arends
- "松居 圭一郎 Keiichiro Matsui" (in Japanese). Hitachi. Retrieved 20 June 2018.
- "松居 圭一郎/ Keiichiro Matsui". www.smash-net.tv (in Japanese). TMONY Japan Corporation. Retrieved 20 June 2018.
- "Asia Junior Championships kicks off in Korea" (in Japanese). BadPal. Retrieved 20 June 2018.
- "Asian Juniors 2012 Team Final – Japan wins first team title". Badzine.net. Retrieved 20 June 2018.
- "松居組で勢い、日本初戦快勝／バドミントン" (in Japanese). Nikkan Sports. Retrieved 20 June 2018.
- "Gritty China Lifts Suhandinata Cup". Badminton World Federation. Retrieved 20 June 2018.