Following the name of the champion(s): Indicates the number of times the competitor has held that title at that point.
[...]
Indicates a gap in the listing where title changes are not known.
<
Title was held or changed hands no later than this. In these cases, it is known that a competitor held the title at a certain time but not when he/she won it.
@
Order uncertain. Different titleholders may be known for the same year, for example, but it is not known who held the title before whom.
#
Unofficial or disputable claims. These are usually matches that certainly took place, but where there is doubt that the competitor shown should be recognized as a true title holder. These listings are also italicized.
International Sports Kickboxing Association
World Muay Thai Heavyweight Title [100kg/220lb] (as of 2025-07-26)
As it is difficult to find comprehensive kickboxing results from the 20th century, these lists are always "under construction." Also this title is controlled by one of those organizations that have world titles in multiple categories such as kickboxing freestyle, K-1 rules, full contact, etc. Because many match results do not specify the category, some of these entries may be for another category. Plus, some kickboxing organizations were known to post the outdated/inaccurate information on their websites especially in 1990's and 2000's. If you have corrections or additional information, please send in!
* Bolded letters in the competitor's name, if any, indicate the surname/family name.
Curtis Schuster *
1997-12<
Listed as the champion in the official ISKA ranking in 97-12; possibly listed by mistake for having (previously) held the super heavyweight title.
Stefan Leko
1998-02<
Listed as the champion in the official ISKA ranking in 98-02; still listed as champion in 2006-07 (possibly by mistake).
Alexey Ignashov
1999
Recognized by ISKA in 99, possibly for defeating Jörgen Kruth on 99-07-29 for the WMC title; listed as the super cruiserweight champion in the official ISKA rankings as late as 2000-05 while Leko continues to be listed as the heavyweight champion as late as 06-07; defends the ISKA title on 2000-03-13.
Azem Maksutaj *
2005
Winterthur, SUI
Defeats Radan Frechichi; Stefan Leko continues to be listed as champion in the official ISKA rankings as Leko as late as 06-07; vacant as of 07-04.
Randy Blake
2011-11-11
Tulsa, OK, USA
Defeats Mike Sheppard for the vacant title; still champion as of 17-07-04; vacant as of 18-12-18.
