The 2016 overall slopestyle champion missed the entirety of last season due to a knee injury but has now laid down a marker before next month's Pyeongchang 2018 Winter Olympics.

Twenty-two-year-old Christiansen, who won Youth Olympic halfpipe silver in Innsbruck in 2012, scored 90.60 points to triumph at the American resort.

She had earlier qualified in second spot after poor weather in California had forced a reshuffle of the schedule with all action taking place today.

Christiansen showed superb work on the rails and landed solid jumps which included a left-side 900 tail grab.

This was her first World Cup victory since February 2016 when she won the Pyeongchang Olympic test event in South Korea.

"The last two years have been just such a roller-coaster for me," said Christiansen.

"I haven't been on top of the podium since 2016, but I've been working hard since my injury and finally this week I had the feeling that I'm strong. 

"I was outside the Olympic team before coming here and I knew I needed a really good result here. 

"Now everything seems to fall in the right place and I'm just so happy and relieved."

Sweden's Jennie-Lee Burmansson scored 88.60 for silver with home skier Caroline Claire grabbing bronze for the United States on 85.00.

In the men's event, Canada's Teal Harle won his second World Cup event.

His tally of 94.20 was enough to triumph as he landed a left rodeo screaming seamen mute off the hip to a right double 1260 tail, and a switch left double 1440 mute to finish.

Andri Ragettli of Switzerland won silver on 92.60 as Evan McEachran won another Canadian medal with bronze on 91.40.

"I actually didn't really like the course here in Mammoth, but I figured it out on the last run of trainings and it somehow worked out for me in the finals so I'm over the moon now," said Harle.