Non Sukkasaweng (Thai: นนที สุดแสาง; born February 23, 1984), known professionally as Nontachai Sit-O (Thai: นนทชัย ศิษย์โอ), is a Thai former professional Muay Thai fighter.
Nontachai started Muay Thai training at the age of 9 and immediately competed to provide financial help to his family.
He joined the Sit O camp in the city of Buriram a few years later.
[3] After his retirement Nontachai became a trainer at the Sit-O camp he then joined Tiger Muay Thai where he coached and competed on the Phuket scene.
[4] In 2014 he joined Evolve in Singapore as a coach.