Yuichi Kobayashi (小林 雄一, Kobayashi Yūichi; born 25 August 1989 in Itabashi, Tokyo) is a Japanese track and field sprinter who specialises in the 200 metres. He represented his country at two consecutive World Championships, in 2011 and 2013. His mother Sumiko Kobayashi (née Kaibara) is a gold medalist in the 200 metres and 4 × 100 metres relay at the 1979 Asian Championships in Tokyo. She was also the former Japanese record holder in the 200 metres with a time of 24.27 seconds.
Source: “Yuichi Kobayashi”, English Wikipedia (CC BY-SA 4.0), excerpt