Anthony Joshua must prove that he is worthy of a fight with Tyson Fury when he rematches Oleksandr Usyk later this year.
That's according to Usyk's countryman and former two-time world heavyweight champion Vitali Klitschko, who ruled the division for years alongside his brother Wladimir.
The elder Klitschko was in London to support fellow Ukrainian Usyk in his first effort against Joshua, and got to see up close what went wrong for the Brit.
