- Born:13 September 1997 (22 years)
Hayato and Genki Koga wore the national team uniform recently to follow in the footsteps of their father, Toshihiko, who won the gold medal in the 71-kilogram division at the 1992 Barcelona Olympics.
Competitions - Medal overview B S G
- World Cups/Continental Open 100
- European Cup Juniors 100
- National Championships Juniors 100