Thanongsak Simsri

Thanongsak Simsri is the current IBF light flyweight world champion. Simsri has held the title since 2025.

World title bouts: 3
Record in world title bouts (won–lost): 3–0
World titles held: 1
Longest world title reign (IBF light flyweight, 2025–present): 1 year, 4 months

Light FlyweightIBF

2025age 24AprJulage 25Oct2026AprJulage 26Oct2027

202520262027

WonLostDrawn or no contest

Timeline of world title events

Oldest firstNewest first

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2026
26th Sep
Thanongsak Simsri beats Mark Vicelles via technical knockout 2/12

Light Flyweight · IBF

Source: Simsri stops Vicelles in 2nd to retain IBF 108-pound world title(opens in a new tab), The Ring, Mosope Ominiyi, 26th Sep 2026
13th Apr
Thanongsak Simsri beats Sergio Mendoza via knockout 2/12

Light Flyweight · IBF

Source: Thanongsak Simsri stops Sergio Mendoza in two, retains IBF crown(opens in a new tab), The Ring, The Ring Staff, 13th Apr 2026
2025
31st Dec
The Ring magazine rates Thanongsak Simsri No. 3 at light flyweight in its annual ratings
19th Jun
Thanongsak Simsri beats Cristian Araneta via split decision 12/12

Light Flyweight · IBF
2024
31st Dec
The Ring magazine rates Thanongsak Simsri No. 6 at light flyweight in its annual ratings