New world heavyweight boxing champion

As of my knowledge cutoff in 2021, the current WBC (World Boxing Council), WBA (World Boxing Association), IBF (International Boxing Federation), and WBO (World Boxing Organization) heavyweight champions are:

Tyson Fury, a British professional boxer, won the WBC heavyweight title by defeating Deontay Wilder in their rematch on February 27, 2020. He then unified the WBC and Ring Magazine titles by defeating Anthony Joshua on August 14, 2021.

Oleksandr Usyk, a Ukrainian professional boxer, won the IBF, WBA (Super), and WBO heavyweight titles by defeating Anthony Joshua on September 25, 2021.

Please note that the heavyweight boxing landscape is constantly changing, and new champions may emerge as a result of upcoming fights or title unifications.