FILE - In this Saturday, Dec. 12, 2020 file photo, World Heavyweight boxing champion Britain's Anthony Joshua celebrates after beating challenger Bulgaria's Kubrat Pulev to win their Heavyweight title fight at Wembley Arena in London. Anthony Joshua faces Oleksandr Usyk in the second defense of his second spell as world heavyweight champion on Saturday Sept. 25, 2021 in front of 60,000 fans at Tottenham Hotspur Stadium. (Andrew Couldridge/Pool via AP, File)

FILE - In this Saturday, Oct. 12, 2019 file photo, Oleksandr Usyk, left, reacts after defeating Chazz Witherspoon during a heavyweight boxing bout, in Chicago. Usyk is scheduled to take on Anthony Joshua for the heavyweight title, at the London Tottenham Hotspur Stadium next Saturday, Sept. 25. (AP Photo/Kamil Krzaczynski, File)

FILE - In this Dec. 12, 2020 file photo, heavyweight boxing champion Britain's Anthony Joshua celebrates after beating challenger Bulgaria's Kubrat Pulev in their title fight at Wembley Arena in London. Anthony Joshua faces Oleksandr Usyk in the second defense of his second spell as world heavyweight champion on Saturday Sept. 25, 2021 in front of 60,000 fans at Tottenham Hotspur Stadium. (Andrew Couldridge/Pool Photo via AP, File)