ONE Championship returns to Lumpinee Stadium with ONE Fight Night 40, headlined by the rematch between Jackie Buntan and Stella Hemetsberger for the women's strawweight kickboxing world title. Buntan is looking to defend her belt and avenge her previous loss in Muay Thai, while Hemetsberger aims to become a champion in two sports. The card also includes an interim Muay Thai featherweight title match between Shadow Singha Mawynn and Nico Carrillo, as well as the participation of figures such as Danny Kingad, Adrian Lee, Shozo Isojima, Fabricio Andrey and Joao Mendes.