The two freestyle skiers were rewarded for their good work in the opening round on Wednesday (February 1) after strong winds caused havoc at the California resort in the United States.

It means France's Martinod has now won both World Cup legs held this season after triumphing in Copper Mountain in December.

Her qualification run included a huge straight air tail grab followed by a back-to-back 540 safety, left and right flair safety and a left 900 safety to achieve 94 points.

"Looking at the weather forecast, we knew the finals could get cancelled," Martinod said.

"Together with my coach we decided to give it all in the qualifications, ski fast and jump high. 

"It worked."

Sochi 2014 Olympic gold medalist Maddie Bowman was handed silver in Mammoth Mountain, with the American the second placed qualifier in front of Japan's Ayana Onozuka.

American Yater-Wallace won the men's event on home snow after his score of 92.33 points in qualification.

He won despite a bruised heel, with the United States clean sweeping the podium as Gus Kenworthy and Taylor Seaton came second and third respectively.

Martinod now has the maximum 200 points available at the top of the overall women's standings, 75 points in front of American Annalisa Drew and 90 more than Onozuka.

Copper Mountain winner Kevin Rolland of France still heads the men's standings with 129 points, but he now only leads tea-mate Ben Valentin by four.

Yater-Wallace has moved up to third on a tally of 118.

The halfpipe season will continue in Pyeongchang in South Korea on February 18, with a test event for the 2018 Winter Olympic Games.

FIS Snowboard Slopestyle World Cup action was also postponed in Mammoth Mountain today, with the organisers hoping to try again tomorrow.