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Klitschko's last fight was in April when he was stopped by Joshua in the 11th round of the WBA title fight at Wembley Stadium in London in a hard-fought bout in which both fighters hit the canvas.
“After my last fight against Anthony Joshua, I deliberately took the time to make a decision,” said Klitschko.
“I never thought I'd have such a long and incredibly successful boxing career, I thank you all from the bottom of my heart,” he told his fans in a statement.
NAMPA/AP