The duo were the main beneficiaries of a depleted field, with many of the top names in the freestyle skiing discipline currently in action at the Winter X Games in Aspen.

Gu and Moffatt nevertheless produced superb displays to earn their first World Cup wins.

Gu had previously finished 11th and second this term and deservedly took her first win with a dominant and stylish routine.

At the age of 15, there could be many more triumphs ahead for the American teenage sensation, who secured victory with a score of 84.40 points.

Megan Oldham of Canada fell 1.40 points adrift and was forced to settle for second, while the bronze medal went to Julia Krass of the United States.

Moffatt topped the men's podium with a score of 83.10, beating Sweden's Oliwer Magnusson by 0.75 points.

Third place was claimed by Kiernan Fagan, who continued the strong performance from the American team with bronze.

The event was the last before the Freestyle Ski and Snowboarding World Championships, which begin in Utah on Friday (February 1).