Several days before their September 25 showdown at Tottenham Hotspur Stadium in London, a nervous Eddie Hearn was expecting a mentally “draining” fight for his client Anthony Joshua of Great Britain. Joshua had height, reach and weight advantages going into defending his WBA, IBF and WBO heavyweight titles against Oleksandr Usyk. Yet Hearn, among other noted boxing pundits, anticipated perhaps the toughest test of the Briton’s career.