- Born:9 March 1999 (20 years)
Japanese judoka Kosuke Mashiyama won gold at the European Open in Oberwart in 2018. He captured a bronze medal at the 2018 Junior World Championships in the Bahamas and the mixed team world title for Juniors. He won the European Cup U21 in Leibnitz in 2018. He clinched a gold medal at the Asian Pacific Championships in Fujairah in 2019. He took a silver medal at the Junior European Cup in Leibnitz in 2019. With the Japanese team he won the junior mixed team World title in 2019.