Xiong Jing Nan defeated Tiffany Teo at ONE: Kings of Courage on 20 January 2018 to win the inaugural ONE Women's Strawweight World Championship. The event also saw another submission-only "grappling super fight", this time between Shinya Aoki and Marat Gafurov. ONE crowned its first champion in Muay Thai at ONE: Unstoppable Dreams on 18 May 2018, when Sam-A Gaiyanghadao stopped Sergio Wielzen for the inaugural ONE Flyweight Muay Thai World Championship. This was followed by ONE's first kickboxing champion at ONE: Battle for the Heavens on 7 July 2018, when the inaugural ONE Atomweight Kickboxing World Championship bout saw Kai Ting Chuang defeat Yodcherry Sityodtong. On 6 October 2018, ONE: Kingdom of Heroes was headlined by Srisaket Sor Rungvisai defending his World Boxing Council championship against Iran Diaz. This is the only boxing match under the ONE Championship banner to date.
