Wladimir Klitschko: Boxing's record-breaking heavyweight who dominated a generation
"Dr Steelhammer" - who has refused a comeback at 45 - will go down as one of the great fighters in heavyweight history.
It will be the first time two British fighters compete for the status as heavyweight's best with all four major world titles on the line.
Joshua - currently enjoying a second reign as unified champion - will certainly take note of an all-time great in Wladimir Klitschko - a legend AJ shared the ring with four years ago.
Together, Klitschko would avenge his defeat to Brewster in imperious fashion and beat all contenders and champions, including David Haye.
Klitschko would fight the following month and outpointed Polish slugger Mariusz Wash in Hamburg to retain his WBA, IBF, WBO, IBO and Ring titles. He dedicated his win to the boxing legend.
Klitschko comeback would break records
I'm sending nothing but positivity and prosperity to all of you, especially those tragically impacted, 2020 punched and humbled all of us to the core. You know what people love seeing more than anything in the world? A COMEBACK😉! I want to see you all comeback strong 👊 in 2021! pic.twitter.com/jYx9i9e6K0
— Klitschko (@Klitschko) January 6, 2021
Vitali said: "When the news came that a TV channel had offered 40million dollars to make a comeback, I called him and asked what was going on." He said, 'This is an offer that does not really interest me.'