New Zealand retain America's Cup with 7-2 win over GB

New Zealand have retained the America's Cup with a 7-2 series win over Britain, sparking wild celebrations on board their boat in the Mediterranean and on shore in Barcelona.

The victory on Saturday makes it a third win in a row for the New Zealand team, who successfully defended the "Auld Mug", which they won in Auckland in 2021 and in Bermuda in 2017.

There were hugs among the crew of eight on board "Taihoro" before the rest of their team joined them to mark a successful finale to a three-year campaign to retain the coveted trophy.

"An amazing feeling... an amazing scoreline," New Zealand skipper Peter Burling said on the America's Cup live broadcast.

The black-clad winning crew were surrounded by a flotilla of boats, horns blaring as they packed up their sails before cracking open large bottles of champagne which Burling and his teammates sprayed over each other and the high-tech boat.

"A credit to the whole team really," New Zealand's team leader Grant Dalton said, thanking the New Zealanders who had come to Spain to support the America's Cup away from home.

British skipper Ben Ainslie paid tribute to the winning team, whom he said were the best ever in the America's Cup, after losing out to the Kiwis in a tightly-fought sea skirmish.

"At the end of the day the better team won," Ainslie said from onboard "Britannia", adding that it was not the end of the journey for the British effort to "bring the Cup home".

Britain has never won the America's Cup, which began in 1851 with a race around the Isle of Wight off the south coast of England, and Ainslie has been trying for a decade to win it.

"It's been a hell of a road through this event," Ainslie said of the campaign to reach the final, which his British team did for the first time in 60 years.

Ainslie's latest attempt, with the backing of British billionaire Jim Ratcliffe, cost more than Stg 100 million ($A195 million) and involved the Mercedes Formula One team.

Taihoro was towed back into Barcelona's port at speed, glistening as it flew above the sparkling sea on its foils.

The crew aboard the British boat waved as they were towed into the harbour, acknowledging support from their supporters before they were greeted with embraces from family and friends when they got back to their base.