Thanongsak Simsri

About Thanongsak Simsri

Thanongsak Simsri (Thai: ทนงศักดิ์ สิมศรี, born 17 June 2000), also known by his ring name Petchkoson Greentsuda (เพชรโกศล กรีนสึดะ) is a Thai professional boxer who has held the International Boxing Federation (IBF) light-flyweight title since June 2025. He is Thailand's 50th world boxing champion and the third to hold this weight class title in this organization, following Muangchai Kittikasem in 1989 and Saman Sorjaturong in 1995.

Bio summary from Wikipedia.