Koji Yamasaki (山﨑 晃嗣, Yamasaki Kōji; born 27 February 1996) is a Japanese field hockey player. He competed in the 2020 Summer Olympics. He was a part of the Japan squad which won their first Asian Games gold medal in men's hockey in 2018.
Source: “Koji Yamasaki (field hockey)”, English Wikipedia (CC BY-SA 4.0), excerpt