[5][6][7] Petchsiam won his first major title on February 7, 2022, when he defeated Petchmawin Singmawynn by decision to capture the Rajadamnern Stadium light flyweight title.
[8] On September 24, 2023, Petchsiam defeated Detchpet Muayded789 by decision at the Channel 7 Stadium.
[10] As of March 2024 he was ranked as one of the 10 best pound-for-pound muay thai fighters in the world by the WMO.
[11] Following his knockout loss against Khunsueklek Boomdeksian in May 2024, Petchsiam's Rajadamnern Stadium Super Bantamweight title was stripped from him.
Petchsamarn Sor.Samarngarment and Parnthep V.K.Khaoyai's interim title fight planned for the month after was promoted to a fight for the regular Rajadamnern Stadium Super Bantamweight title.