McMorris received scores of 92.75 and 86.50 on his opening two runs to post a total of 179.25 points - and win a maiden world title.

The 27-year-old is a two-time world silver medallist and two-time Olympic bronze medallist in slopestyle, but turned it on in today's big air final to beat compatriot Max Parrot by a single point.

Norway's Marcus Kleveland, who already won slopestyle gold at the FIS World Championships in Colorado this month and is the Winter X Games big air champion, was the men's bronze medallist thanks to a final-run score of 97.75 - the best of the day.

Blouin, previously a world champion and Olympic runner-up in slopestyle, also won by a point in the women's contest.

A final run scoring 89.75 gave Blouin a total of 177.75 and denied Zoi Sadowski-Synnott a second gold medal of the World Championships.

The New Zealander, who had already secured back-to-back slopestyle world titles, came second, with Japan's Miyabi Onitsuka completing the podium.

Onitsuka placed second in the X Games big air at this resort last month, when Sadowski-Synnott was third.

On skis, 20-year-old Anastasia Tatalina was a resounding victor for the Russian Ski Federation and made history as the first woman to land left- and right-side double cork 1260s in competition.

Tatalina scored 93.00 and 91.50 for a total of 184.50 - some 19 points ahead of Lana Prusakova, who won silver for the Russian Ski Federation.

China's Eileen Gu had to settle for third place - a stunning third medal of the World Championships for the 17-year-old, following slopestyle and halfpipe victories.

On the men's side, Oliwer Magnusson backed up being the best performer in qualifying by winning the gold medal.

Needing to increase a second-run score of 87.00 by at least 2.00 points on the final run of the competition, the Swede dropped a 91.00 to win and relegate Canadian teenager Edouard Therriault to second place.

Swiss skier Kim Gubser was third.

Today was the last day of competition in Aspen.