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AJ suffered just the second defeat of his career against the Ukrainian last September and has stated that “everything is at stake” as he aims to take back his belts.
Usyk weighed in at 15st 11lbs (100.5kg) and Joshua, 32, came in at 17st 6lbs (110.9kg).
Here's everything you need to know about Oleksandr Usyk vs Anthony Joshua
The ring walks for Anthony Joshua and Oleksandr Usyk are scheduled for just before 11PM UK time on Saturday 20 August, and the fight is set to start minutes later.
The undercard will get going at around 3.30pm BST, before the official coverage on Sky Sports Box Office begins at 6PM.