Open Boxing

IBF light flyweight world title

Covers world title bouts since 1983. Current champion: Thanongsak Simsri, since 19th Jun 2025.

World title bouts
88
Champions
26
Longest reign (Michael Carbajal, 1990–1994)
3 years, 6 months
Most successful defences in one reign (Michael Carbajal, 1990–1994)
9

Current champion

Thanongsak SimsriSince 19th Jun 2025 · 1 year, 4 months · 2 successful defences

Reigns and world title bouts

Jan 2022 – Jan 2027

IBF
Sivenathi NontshingaCurielSivenathi NontshingaYabukiThanongsak Simsri
AprJulOct2023AprJulOct2024AprJulOct2025AprJulOct2026AprJulOct2027
1990200020102020

World title bout

Reigns by length

  1. 1Michael CarbajalIBF1990–19943 years, 6 months · 9 successful defences
  2. 2Felix AlvaradoIBF2018–20223 years, 4 months · 2 successful defences
  3. 3Ulises SolisIBF2006–20093 years, 3 months · 7 successful defences
  4. 4Ricardo LopezIBF1999–20023 years, 1 month · 2 successful defences
  5. 5Dodie Boy PenalosaIBF1983–19862 years, 7 months · 3 successful defences
  6. 6Jose BurgosIBF2003–20052 years, 2 months · 1 successful defence
  7. 7Choi Jum-hwanIBF1986–19881 year, 10 months · 3 successful defences
  8. 8John Riel CasimeroIBF2012–20141 year, 9 months · 3 successful defences
  9. 9Thanongsak SimsriIBF2025–present1 year, 4 months · 2 successful defences
  10. 10Humberto GonzalezIBF1994–19951 year, 4 months · 3 successful defences
  11. 11Akira YaegashiIBF2015–20171 year, 4 months · 2 successful defences
  12. 12Javier MendozaIBF2014–20151 year, 3 months · 1 successful defence
  13. 13Muangchai KittikasemIBF1989–19901 year, 2 months · 3 successful defences
  14. 14Ulises SolisIBF2011–20121 year, 2 months · 1 successful defence
  15. 15Sivenathi NontshingaIBF2022–20231 year, 2 months · 1 successful defence
  16. 16Luis Alberto LazarteIBF2010–201111 months · 1 successful defence
  17. 17Michael CarbajalIBF1996–199710 months · 2 successful defences
  18. 18Will GrigsbyIBF1998–19999 months · 1 successful defence
  19. 19Brian ViloriaIBF2009–20109 months · 1 successful defence
  20. 20Mauricio PastranaIBF1997–19988 months · 1 successful defence
  21. 21Sivenathi NontshingaIBF2024–20247 months · 0 successful defences
  22. 22Will GrigsbyIBF2005–20067 months · 0 successful defences
  23. 23Milan MelindoIBF2017–20177 months · 1 successful defence
  24. 24Masamichi YabukiIBF2024–20255 months · 0 successful defences
  25. 25Tacy MacalosIBF1988–19895 months · 1 successful defence
  26. 26Saman SorjaturongIBF1995–19965 months · 1 successful defence
  27. 27Ryoichi TaguchiIBF2017–20184 months · 0 successful defences
  28. 28Carlos TamaraIBF2010–20104 months · 0 successful defences
  29. 29Mauricio PastranaIBF1997–19973 months · 0 successful defences
  30. 30Adrian CurielIBF2023–20243 months · 0 successful defences
  31. 31Hekkie BudlerIBF2018–20182 months · 0 successful defences

Timeline of world title events

  1. 1983

  2. Dodie Boy Penalosa beats Satoshi Shingaki via knockout 12/15

    Light Flyweight · IBFNew champion

  3. 1984

  4. Dodie Boy Penalosa beats Jae Hong Kim via knockout 7/15

    Light Flyweight · IBF

  5. Dodie Boy Penalosa beats Choi Jum-hwan via unanimous decision 15/15

    Light Flyweight · IBF

  6. 1985

  7. Dodie Boy Penalosa beats Yani Dokolamo via knockout 3/15

    Light Flyweight · IBF

  8. 1986

  9. Dodie Boy Penalosa’s reign as the IBF light flyweight world champion ends

    Light Flyweight · IBF

  10. Choi Jum-hwan beats Cho Woon Park via unanimous decision 15/15

    Light Flyweight · IBFNew champion

  11. 1987

  12. Choi Jum-hwan beats Tacy Macalos via split decision 15/15

    Light Flyweight · IBF

  13. Choi Jum-hwan beats Toshihiko Matsuda via knockout 4/15

    Light Flyweight · IBF

  14. Choi Jum-hwan beats Azadin Anhar via knockout 3/15

    Light Flyweight · IBF

  15. 1988

  16. Choi Jum-hwan’s reign as the IBF light flyweight world champion ends

    Light Flyweight · IBF

    Tacy Macalos becomes the IBF light flyweight world champion

    Light Flyweight · IBFNew champion

  17. Tacy Macalos beats Choi Jum-hwan via unanimous decision 12/12

    Light Flyweight · IBF

  18. 1989

  19. Muangchai Kittikasem beats Tacy Macalos via split decision 12/12

    Light Flyweight · IBFNew champion

  20. Muangchai Kittikasem beats Tacy Macalos via knockout 7/12

    Light Flyweight · IBF

  1. 1990

  2. Muangchai Kittikasem beats Jeung Jae Lee via knockout 3/12

    Light Flyweight · IBF

  3. Muangchai Kittikasem beats Abdi Pohan via unanimous decision 12/12

    Light Flyweight · IBF

  4. Michael Carbajal beats Muangchai Kittikasem via knockout 7/12

    Light Flyweight · IBFNew champion

  5. Michael Carbajal beats Leon Salazar via knockout 4/12

    Light Flyweight · IBF

  6. 1991

  7. Michael Carbajal beats Macario Santos via knockout 2/12

    Light Flyweight · IBF

  8. Michael Carbajal beats Javier Varguez via unanimous decision 12/12

    Light Flyweight · IBF

  9. Michael Carbajal beats Hector Luis Patri via unanimous decision 12/12

    Light Flyweight · IBF

  10. 1992

  11. Michael Carbajal beats Marcos Pacheco via unanimous decision 12/12

    Light Flyweight · IBF

  12. Michael Carbajal beats Robinson Cuesta via knockout 8/12

    Light Flyweight · IBF

  13. 1993

  14. Michael Carbajal beats Humberto Gonzalez via knockout 7/12

    Light Flyweight · WBC and IBF

  15. Michael Carbajal beats Kwang Sun Kim via knockout 7/12

    Light Flyweight · WBC and IBF

  16. Michael Carbajal beats Domingo Sosa via knockout 5/12

    Light Flyweight · WBC and IBF

  17. 1994

  18. Humberto Gonzalez beats Michael Carbajal via split decision 12/12

    Light Flyweight · WBC and IBFNew IBF champion

  19. Humberto Gonzalez beats Juan Domingo Cordoba via corner retirement 7/12

    Light Flyweight · WBC and IBF

  20. Humberto Gonzalez beats Michael Carbajal via majority decision 12/12

    Light Flyweight · WBC and IBF

  21. 1995

  22. Humberto Gonzalez beats Jesus Zuniga via knockout 5/12

    Light Flyweight · WBC and IBF

  23. Saman Sorjaturong beats Humberto Gonzalez via knockout 7/12

    Light Flyweight · WBC and IBFNew IBF champion

  24. Saman Sorjaturong beats Yuichi Hosono via knockout 4/12

    Light Flyweight · WBC and IBF

  25. 1996

  26. Saman Sorjaturong’s reign as the IBF light flyweight world champion ends

    Light Flyweight · IBF

  27. Michael Carbajal beats Melchor Cob Castro via unanimous decision 12/12

    Light Flyweight · IBFNew champion

    Michael Carbajal beats Melchor Cob Castro via unanimous decision 12/12

    Light Flyweight · IBFNew champion

  28. Michael Carbajal beats Julio Coronel via knockout 8/12

    Light Flyweight · IBF

  29. Michael Carbajal beats Tomas Rivera via knockout 5/12

    Light Flyweight · IBF

  30. 1997

  31. Mauricio Pastrana beats Michael Carbajal via split decision 12/12

    Light Flyweight · IBFNew champion

  32. Mauricio Pastrana’s reign as the IBF light flyweight world champion ends

    Light Flyweight · IBF

  33. Manuel Jesus Herrera and Anis Roga draw via technical decision 12/12

    Light Flyweight · IBF

  34. Mauricio Pastrana beats Manuel Jesus Herrera via knockout 3/12

    Light Flyweight · IBFNew champion

  35. 1998

  36. Mauricio Pastrana beats Anis Roga via knockout 4/12

    Light Flyweight · IBF

  37. Mauricio Pastrana’s reign as the IBF light flyweight world champion ends

    Light Flyweight · IBF

  38. Mauricio Pastrana beats Carlos Murillo via knockout 9/12

    Light Flyweight · IBF

  39. Will Grigsby beats Ratanapol Sor Vorapin via unanimous decision 12/12

    Light Flyweight · IBFNew champion

  40. 1999

  41. Will Grigsby beats Carmelo Caceres via unanimous decision 12/12

    Light Flyweight · IBF

  42. Ricardo Lopez beats Will Grigsby via unanimous decision 12/12

    Light Flyweight · IBFNew champion

  1. 2000

  2. Ricardo Lopez beats Ratanapol Sor Vorapin via knockout 3/12

    Light Flyweight · IBF

  3. 2001

  4. Ricardo Lopez beats Zolani Petelo via knockout 8/12

    Light Flyweight · IBF

  5. 2002

  6. Ricardo Lopez’s reign as the IBF light flyweight world champion ends

    Light Flyweight · IBF

  7. 2003

  8. Jose Burgos beats Alex Sanchez via knockout 12/12

    Light Flyweight · IBFNew champion

  9. Rosendo Alvarez and Jose Burgos draw via split decision 12/12

    Light Flyweight · WBA, IBF and The Ring

  10. 2004

  11. Jose Burgos beats Thongchai Utaida via knockout 6/12

    Light Flyweight · IBF

  12. 2005

  13. Will Grigsby beats Jose Burgos via unanimous decision 12/12

    Light Flyweight · IBFNew champion

  14. 2006

  15. Ulises Solis beats Will Grigsby via unanimous decision 12/12

    Light Flyweight · IBFNew champion

  16. Ulises Solis beats Eric Ortiz via knockout 9/12

    Light Flyweight · IBF

  17. Ulises Solis and Omar Salado draw via points decision 12/12

    Light Flyweight · IBF

  18. 2007

  19. Ulises Solis beats Will Grigsby via corner retirement 8/12

    Light Flyweight · IBF

  20. Ulises Solis beats Jose Antonio Aguirre via knockout 9/12

    Light Flyweight · IBF

  21. Ulises Solis beats Rodel Mayol via knockout 8/12

    Light Flyweight · IBF

  22. Ulises Solis beats Bert Batawang via knockout 9/12

    Light Flyweight · IBF

  23. 2008

  24. Ulises Solis beats Glenn Donaire via unanimous decision 12/12

    Light Flyweight · IBF

  25. Ulises Solis beats Nerys Espinoza via unanimous decision 12/12

    Light Flyweight · IBF

  26. 2009

  27. Brian Viloria beats Ulises Solis via knockout 11/12

    Light Flyweight · IBFNew champion

  28. Brian Viloria beats Jesus Iribe via unanimous decision 12/12

    Light Flyweight · IBF

  1. 2010

  2. Carlos Tamara beats Brian Viloria via knockout 12/12

    Light Flyweight · IBFNew champion

  3. Luis Alberto Lazarte beats Carlos Tamara via split decision 12/12

    Light Flyweight · IBFNew champion

  4. Luis Alberto Lazarte beats Nerys Espinoza via unanimous decision 12/12

    Light Flyweight · IBF

  5. Luis Alberto Lazarte and Ulises Solis draw via majority decision 12/12

    Light Flyweight · IBF

  6. 2011

  7. Ulises Solis beats Luis Alberto Lazarte via split decision 12/12

    Light Flyweight · IBFNew champion

  8. Ulises Solis beats Jether Oliva via unanimous decision 12/12

    Light Flyweight · IBF

  9. 2012

  10. Ulises Solis’s reign as the IBF light flyweight world champion ends

    Light Flyweight · IBF

    John Riel Casimero becomes the IBF light flyweight world champion

    Light Flyweight · IBFNew champion

  11. John Riel Casimero beats Pedro Guevara via split decision 12/12

    Light Flyweight · IBF

  12. 2013

  13. John Riel Casimero beats Luis Alberto Rios via unanimous decision 12/12

    Light Flyweight · IBF

  14. John Riel Casimero beats Felipe Salguero via knockout 11/12

    Light Flyweight · IBF

  15. 2014

  16. John Riel Casimero’s reign as the IBF light flyweight world champion ends

    Light Flyweight · IBF

  17. John Riel Casimero beats Mauricio Fuentes via knockout 1/12

    Light Flyweight · IBF

  18. Javier Mendoza beats Ramon Garcia Hirales via unanimous decision 12/12

    Light Flyweight · IBFNew champion

  19. 2015

  20. Javier Mendoza beats Milan Melindo via technical decision 6/12

    Light Flyweight · IBF

  21. Akira Yaegashi beats Javier Mendoza via unanimous decision 12/12

    Light Flyweight · IBFNew champion

  22. 2016

  23. Akira Yaegashi beats Martin Tecuapetla via split decision 12/12

    Light Flyweight · IBF

  24. Akira Yaegashi beats Wittawas Basapean via knockout 12/12

    Light Flyweight · IBF

  25. 2017

  26. Milan Melindo beats Akira Yaegashi via knockout 1/12

    Light Flyweight · IBFNew champion

  27. Milan Melindo beats Hekkie Budler via split decision 12/12

    Light Flyweight · IBF

  28. Ryoichi Taguchi beats Milan Melindo via unanimous decision 12/12

    Light Flyweight · WBA Super, IBF and The RingNew IBF champion

  29. 2018

  30. Hekkie Budler beats Ryoichi Taguchi via unanimous decision 12/12

    Light Flyweight · WBA Super, IBF and The RingNew IBF champion

  31. Hekkie Budler’s reign as the IBF light flyweight world champion ends

    Light Flyweight · IBF

  32. Felix Alvarado beats Randy Petalcorin via knockout 7/12

    Light Flyweight · IBFNew champion

  33. 2019

  34. Felix Alvarado beats Reiya Konishi via unanimous decision 12/12

    Light Flyweight · IBF

  1. 2021

  2. Felix Alvarado beats DeeJay Kriel via knockout 10/12

    Light Flyweight · IBF

  3. 2022

  4. Felix Alvarado’s reign as the IBF light flyweight world champion ends

    Light Flyweight · IBF

  5. Sivenathi Nontshinga beats Hector Flores Calixto via split decision 12/12

    Light Flyweight · IBFNew champion

  6. 2023

  7. Sivenathi Nontshinga beats Regie Suganob via unanimous decision 12/12

    Light Flyweight · IBF

  8. Adrian Curiel beats Sivenathi Nontshinga via knockout 2/12

    Light Flyweight · IBFNew champion

  9. 2024

  10. Sivenathi Nontshinga beats Adrian Curiel via technical knockout 10/12

    Light Flyweight · IBFNew champion

  11. Masamichi Yabuki beats Sivenathi Nontshinga via technical knockout 9/12

    Light Flyweight · IBFNew champion

  12. 2025

  13. Masamichi Yabuki’s reign as the IBF light flyweight world champion ends

    Light Flyweight · IBF

  14. Thanongsak Simsri beats Cristian Araneta via split decision 12/12

    Light Flyweight · IBFNew champion

  15. 2026

  16. 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,

  17. 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,