Klitschko: "Usyk is a unique boxer, but Joshua could still come back"

"Alexander has remained undefeated for so long... He's won all the heavyweight belts and is now the world heavyweight champion. He's a special guy who has done historic things," declared one of the longest-running world champions in history.

"I once lost two fights in one year, then came back to the throne and became one of the longest reigning champions in heavyweight history. Joshua still has plenty of time, I don't doubt him, he just needs to take the challenge," the 45-year-old Klitschko said.