He defeated Georgia's Varlam Liparteliani, who took silver. China's Cheng Xunzhao and 2015 world champion Gwak Dong-han of South Korea each took bronze.
On the women's side, Japan's Haruka Tachimoto also won a gold medal.. Japan has now won three gold medals in judo and five overall.
Rio 2016
Egyptian judoka sent home over handshake refusal with Israeli
15/08/2016 AT 19:51
It was a disappointing day for France, a traditional judo champion. France, one of three countries fielding a full team of 14 judokas in Rio, was hoping for a repeat of its performance at the 2012 London Games when it claimed seven judo medals - tied for the most with Japan.
Rio 2016
Egyptian booed for not shaking hands with Israeli
12/08/2016 AT 17:55
Rio 2016
Harrison defends title as women's -78kg champion
11/08/2016 AT 20:58