Oleksandr Usyk (born 1987) of Ukraine is the undisputed heavyweight champion of the world and the only cruiserweight in history to become the undisputed champion in that division before moving up.

Career Highlights

• Professional record: 22 wins, 14 by KO, 0 losses
• Undisputed cruiserweight champion; undisputed heavyweight champion
• Olympic gold medalist, 2012 London Games
• Two victories over Anthony Joshua

Usyk's combination of footwork, angles, and intelligence make him unique among heavyweights. He became undisputed heavyweight champion in 2024 by defeating Tyson Fury — the first undisputed heavyweight champion since Lennox Lewis in 1999.

Reference:

Wikipedia: Oleksandr Usyk

https://en.wikipedia.org/wiki/Oleksandr_Usyk