World Boxing Super Series boxing tournament attempt since the Super Six World Boxing Classic, which took place from 2009 to 2011. The first season of tournament was held from 2017 to 2018 at two weight classes: cruiserweight and super middleweight. The inaugural tournament started in September 2017 and finished with two finals in the summer of 2018. With the tournament, the cruiserweight division crowned its first undisputed champion since 2006. At a press conference in London on 9 May 2018, a second season was announced, which would take place from 2018 to 2019. Bantamweight and light welterweight was confirmed as two of the three
Undisputed championship Olympic Auditorium World Heavyweight Championship. In light of having unified three of the major world heavyweight championships of his time (as well as numerous other lesser-prestige titles) and defeating the reigning AWA World Heavyweight Champion in a non-title match (a major title that was abandoned soon after), Thesz became the Undisputed Champion for some time. From that point onward, the National Wrestling Alliance World Heavyweight Championship (the championship belt that Thesz opted to keep as the designation of all the championships he had won) became the undisputed world heavyweight title for all contenders to seek. This, however, would change over