Oleksandr Oleksandrovych Usyk (Ukrainian: Олекса́ндр Олекса́ндрович У́сик; born 17 January 1987) is a Ukrainian professional boxer. He has held multiple world championships in two weight classes, including the unified WBA (Super), IBF, and WBO heavyweight titles since 2021, and the Ring magazine heavyweight title since 2022. 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.
Usyk is widely regarded as one of the greatest Ukrainian boxers of all time. With his victory over Anthony Joshua in 2021, Usyk became one of only three boxers to have unified the cruiserweight world titles and become a world heavyweight champion, joining Evander Holyfield and David Haye.
As an amateur, Usyk won heavyweight gold medals at the 2011 World Championships and 2012 Olympics. He turned professional in 2013 and won the undisputed cruiserweight championship in his 15th professional fight in 2018. Three of his titles were won during the inaugural World Boxing Super Series, in which he won the Muhammad Ali Trophy, as well as the Ring and lineal cruiserweight titles. For his achievements, Usyk was named the 2018 Fighter of the Year by Sports Illustrated, ESPN, The Ring and the Boxing Writers Association of America (BWAA).

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