The bout was announced on Sunday evening by ONE CEO Chatri Sityadong on Twitter.
BREAKING NEWS: Demetrious Johnson (30-3) will challenge ONE Flyweight World Champion Adriano Moraes (18-3) for the world title on April 11 in China!
— Chatri Sityodtong (@yodchatri) January 13, 2020
Demetrious Johnson fights for flyweight gold
Johnson (30-3) signed with ONE Championship in October 2018 after fighting out his UFC contract.