Koji Masuda (益田 弘二, Masuda Kōji; born 1 February 1944) is a Japanese boxer. He competed in the men's light middleweight event at the 1964 Summer Olympics. At the 1964 Summer Olympics, he defeated Jannie Gibson of Rhodesia in the Round of 32 before losing to Joseph Gonzales of France in the Round of 16.
Source: “Koji Masuda”, English Wikipedia (CC BY-SA 4.0), excerpt