Wladimir Klitschko is a Ukrainian former professional boxer who competed from 1996 to 2017. He held the world heavyweight championship twice, including the unified WBA (Super), IBF, WBO, IBO, and Ring magazine titles. A strategic and intelligent boxer, Klitschko is considered to be one of the greatest heavyweight champions of all time. He was known for his exceptional knockout power, using a strong jab, straight right hand and left hook, quick hand speed, great physical strength which he employed when clinching opponents, and his athletic footwork and mobility, unusual for boxers of his size.

Heavyweight is a weight class in combat sports and professional wrestling.