Unbeaten Kiwi heavyweight Joseph Parker says he will wait until fight night to decide how to beat Anthony Joshua.

The 26-year-old, who faces off against the undefeated Londoner at Cardiff's Principality Stadium on Saturday, says it is his "time" to take hot favourite Joshua's WBA, IBF and IBO titles back to New Zealand.

The relatively respectful build-up to one of boxing's biggest events of the year continued with both camps calm and confident ahead of the blockbuster bout, some good-natured banter between rival promoters David Higgins and Eddie Hearn providing the welcome theatre.

"We've had a great build-up, we've had a tremendous camp, had some great sparring sessions and a lot of pain but we've embraced it," Parker said. "I'm looking forward to putting on the best Joseph Parker there is.

"I feel ready, I feel confident, I feel sharp. My movement is better than ever. I'm taking those belts back to New Zealand and Samoa."

London Olympic gold medallist Joshua won the IBO nad WBA 'super' crowns with his stunning victory over Ukrainian legend Wladimir Klitschko at Wembley Stadium last year.

His trainer, Rob McCracken, said that fight remained Joshua's toughest challenge.

"I think Klitschko is his toughest test to date without a shadow of a doubt," McCracken said.

"Fifty-six or something knockouts ... I think that's his biggest test and this is the next biggest - it's a hurdle Anthony's got to get over.

Joshua expects to put Parker away around the eight and ninth rounds.

"The difference is I know how to counter-punch,” said Joshua.

“I haven’t seen Parker counter-punching anyone. I’ll punish him when he’s throwing at me, and I’ll punish him when he’s thinking of throwing at me. I’ll break him down.

“Rounds five to eight, it’ll be a tough night. But, if everything goes to plan I think Parker will fade between round eight and nine.”