Joseph Parker's heavyweight unification fight with Anthony Joshua is already breaking records.

The blockbuster fight set for April 1 (NZT) has already sold in excess of 70,000 tickets - breaking the record for the fastest selling event at Cardiff's Principality Stadium, where the bout is being held.

Joshua's promoter Eddie Hearn revealed on social media the tickets sold out in just over an hour.

The previous record was also held by a Joshua fight - an October 2017 scheduled fight against Kubrat Pulev who would ultimately be replaced on two weeks-notice by Carlos Takam.

There will be limited tickets made available next week and police have warned punters to be aware of fraudsters looking to cash in.

Newshub.