Oleksandr Oleksandrovych Usyk is a Ukrainian professional boxer. He has held multiple world championships in two weight classes, including the unified heavyweight titles since 2021, and the Ring magazine title since 2022. He has also held the International Boxing Organization (IBO) title since 2021. Previously, he held the undisputed cruiserweight championship from 2018 to 2019, being the first boxer in that division to hold all four major world titles.

David Deron Haye is a British former professional boxer who competed between 2002 and 2018. He held multiple world championships in two weight classes, and was the first British boxer to reach the final of the World Amateur Boxing Championships, where he won a silver medal in 2001.