Anthony Joshua's training partner has revealed the world champion has sparred more amateur fighters than professionals to prepare for Oleksandr Usyk.
Britain's unified champion defends his WBA, WBO and IBF world titles in one of the toughest tests of his career against Usyk on Saturday night at the Tottenham Hotspur Stadium.
Usyk is a slick southpaw, an Olympic gold medallist and former cruiserweight champion, who is yet to taste defeat as a professional.
The Ukrainian had a distinguished amateur career before turning over and Joshua's camp believe he still fights in the similar style to the unpaid ranks.