T
Junior Flyweight · Thailand
Thanongsak Simsri
Record
39-1-0
KO rate
90%
Bouts
40
Rounds
145
Age
26
Stance
orthodox
Height
5'3" / 161 cm
Reach
64 in / 164 cm
Debut
2018
Titles
- IBF World Junior Flyweight Champion
Fight cards
Loading card schedule.
Profile
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.
Born in Sisaket, Thailand.