Joseph Parker's promoter David Higgins said Parker's heavyweight unification clash against Anthony Joshua could be the "biggest indoor boxing event in world history".

Higgins told the Herald that Team Parker were "delighted" at the news that more than 70,000 tickets had already sold, and believed the fight may have already broken up to five records.

Read more: Boxing: Seventy thousand tickets sold for Joseph Parker and Anthony Joshua's fight

"I think it will be the biggest indoor boxing event in world history, it will be the quickest Principality Stadium sold out, and then on a New Zealand front for a one-off sporting event, I think it's the biggest in history by revenue," Higgins said.

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"It could also be the record for revenue in a British boxing event."

"It's a massive event for history ... It's something that team Parker and everyone who's contributed should feel proud of."

Read more: Joseph Parker set for huge pay day against Anthony Joshua

Joseph Parker and Anthony Joshua will face off at Cardiff Principality Stadium. Photo / Getty
Joseph Parker and Anthony Joshua will face off at Cardiff Principality Stadium. Photo / Getty

On top of ticket sale records, Higgins said Parker could also break the record for the biggest payday in New Zealand sports history.

"There's speculation as to what Joseph might earn, that could be a record to, I won't' put a figure on it but he'll be set up for life," said Higgins.

Higgins told the Herald that although it was yet to be confirmed, the pay-for-view costs would likely be $49.95.

"Joseph's world title win in December in 2016 was $59.95, for this one I'll be recommending maybe $49.95, that's still to be confirmed."

The clash for the IBF, IBO, WBA Super and WBO World titles will air on April 1 (NZT).