David Haye
The Hayemaker, along with Evander Holyfield, are just two boxers in history to have unified the cruiserweight world titles and gone on to become a world heavyweight champion. The British boxer David Haye is also known for holding world championships in two weight classes. In 2015, he made his heavyweight comeback. While he did lose to Tony Bellew due to a tear in the right Achilles tendon, everyone said that Haye’s comeback is what legends are made of. Fret not, the Haye vs. Bellew II fight is scheduled for May 5, 2018.
Wladimir Klitschko
Thanks to his skill as a strategic and intelligent boxer, Wladimir Klitschko is regarded as one of the greatest heavyweight champions of all time. From 1996 to 2017, the Ukranian is a two-time world heavyweight champion, as he’s held the WBA (Super), IBF and WBO titles. Moreover, he’s held the IBO, Ring magazine, and lineal titles. Currently, BoxRec ranks Klitschko as the 12th best boxer of all time, pound for pound. In 2017, he officially retired.