Events in the halfpipe had been scheduled to conclude the Junior World Championships on Friday (September 8), but organisers announced on August 17 they would not be able to take place due to "a lack of early season snowfall leading to insufficient preparation time".

Hasegawa claimed a snowboard slopestyle and Big Air double in the men's competitions.

The 17-year-old had already won FIS Snowboard World Cup events in both disciplines this year, and underlined her status as a rising star in Cardrona.

In the slopestyle, none of the 14 athletes completed two clean runs, but Hasegawa's second attempt scored 90.25 points to earn gold.

Defending champion Cameron Spalding of Canada had to settle for silver from his 87.25 first attempt, and Yuto Miyamura of Japan took bronze with 84.75.

Hasegawa was crowned senior world Big Air champion in the Georgian resort of Bakuriani earlier this year, and was big favourite to defend his junior title.

He did that with a dominant display in the final, scoring 184.25 combined from his first and third runs.

Rocco Jamieson of New Zealand earned silver with 162.00, and Italy's Ian Matteoli rounded off the top three with 157.00.

The women's snowboard competition began with success for the hosts in the slopestyle.

Lucia Georgalli was crowned New Zealand's first park and pipe junior world champion with the two best runs of the day, starting with an 85.25 on her first attempt and bettering it to 91.00 on her second.

There were big gaps between the top three, with Italy's Fanny Piantanida scoring 77.25 in second and Ally Hickman of Australia 66.50 in third.

At the age of 13, Hickman was the youngest rider in the final.

The women's Big Air title went to Canada's Emeraude Maheux, who produced a score of 169.00.

Yu Seoung-eun of South Korea was second with 156.50, with Japan's Kiara Morii third with 150.00.

The Junior World Championships also featured competition in the freeski slopestyle and Big Air, in which gold medals were won by four different nations.

Germany's Muriel Mohr won the women's slopestyle with a score of 86.25, but the runner-up in the first event Flora Tabanelli claimed Big Air gold with 177.50, becoming Italy's first park and pipe junior world champion.

Chinese duo Han Linshan and Yang Ruyi were second and third respectively in the Big Air, while the slopestyle podium was completed by New Zealand's Mischa Thomas.

On the men's side, Canada's Charlie Beatty moved from last to first on his second slopestyle run with a score of 92.25, overtaking Fadri Rhyner of Switzerland and Leo Landroe of Norway.

Landroe upgraded to gold in the Big Air with an impressive 189.75, with Canada's Matthew Lepine placing second and Rhyner adding another medal with a bronze.