World Boxing Association and International Boxing Federation belt holder Joshua and World Boxing Organisation champion Parker will go toe-to-toe in the Principality Stadium in the Welsh capital. Then Parker flew there this weekend with the deal all but done for a fight that will be televised on Sky Sports Box Office pay-per-view in the United Kingdom.
If Joshua beats the 26-year-old Parker (WBO), he will likely next take on unbeaten American Deontay Wilder (WBC).
'These fights aren't easy because there is a lot on the line, so respect to team Parker for taking the challenge.
"You never really can tell what sort of weight [Joshua is] going to be, but I know Joseph Parker will definitely be coming in a little lighter than he was for the Hughie Fury fight".
Joshua's promoter Eddie Hearn tied up the final details with Parker's promoter David Higgins over the weekend. A couple of months ago I heard him say "why should I be anxious about this little kid from New Zealand"?
"Well, now he's about to find out".
He made two successful defences of the title before claiming two further straps, the WBA title and lightly-regarded IBO belt, with a cracking stoppage win over former lineal heavyweight champion Wladimir Klitschko at Wembley last April. "Champions should fight Champions and AJ continues to step up to the challenges", Hearn said.
"It's the first time in history that two reigning heavyweight world champions have met in Britain. This is another huge unification fight for Anthony as he continues to make history in the quest to become undisputed World heavyweight champion".
He clearly showed he could, against Klitschko, but he also struggled to hold off the much older Klitschko at times in that fight.
Even in the face of hardcore trash talk from long time bitter rival Dillian Whyte Joshua managed to keep his composure right through the build-up and save his fury for fight night when he viciously knocked his rival out.
"Joseph Parker is the absolute epitome of the Kiwi sporting battler".
In his last outing, Joshua laboured to a tenth-round TKO win over tough late-replacement Carlos Takam, who had stepped in for the injured Kubrat Pulev, at the Principality Stadium in October.
Wilder, 32, is 39-0 with 38 knockouts.
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