The WBA, IBF, WBO and IBO World titles will be on the line on Easter weekend, in the same stadium where Joshua extended his undefeated record to 20-0, with a tenth round TKO victory over Carlos Takam, in October. A couple of months ago I heard him say "why should I be anxious about this little kid from New Zealand"?
Negotiations have been taking place between the two camps for several months, with Parker's representative, David Higgins flying to the United Kingdom last week to finalise the deal. "Training camp is underway and before you know it, March 31 will be upon us".
Part of Parker's approach has been to taunt Joshua for his supposed "glass chin", and the Kiwi made reference once again of his plans to expose his frail defence when the pair eventually meet.
The long rumoured bout, which had stalled over financial demands, was confirmed on Twitter by Joshua's promoter Eddie Hearn.
The aggressive approach by Parker to flush out Joshua for this lucrative fight has clearly hit a nerve with the big Brit.
"I'm going to smash him up to the body", said Joshua. "Champions should fight Champions and AJ continues to step up to the challenges", Hearn said. "This is another huge unification fight for Anthony as he continues to make history in the quest to become undisputed world heavyweight champion".
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They also offered to pay £10,000 to anyone who could provide further footage.
Parker has questioned the punch resistance of Joshua, who was floored for the first time in his professional career in the Wembley win over Wladimir Klitschko, even ending his own tweets with the mocking hashtag of 'never been dropped'. He's consistently fought fighters in the world's top ten and he's beaten them all easily.
"But I think I can beat anyone in the world - I would not be here if I did not believe in myself".
New Zealand's Parker (24-0, 18 KOs), 26, won a vacant title by majority decision over Andy Ruiz Jr.in December 2016 in New Zealand and has made two defenses.
Parker's last fight was in England when he defended his WBO title for the second time, beating Britain's Hughie Fury on points in Manchester in September.
The victor of the clash is likely to face WBC champion Deontay Wilder in another unification bout this summer.