ASPEN — Kelly Sildaru is too young to ski in World Cup contests. But she isn’t too young to win them.

The 13-year-old YouTube sensation from Estonia became the youngest Winter X Games gold medalist on Friday, spinning her trademark switch 900s both left and right to earn the biggest win of her career, which began with internet videos showing her technical prowess as a precocious 10-year-old spinning tricks that challenged pros.

The 5-feet-1, 88-pound athlete — the lightest and shortest at this year’s Winter X — has been heralded as the future of freeskiing since 2011. She confirmed her catalyst status in December when she won the Dew Tour in Breckenridge, beating athletes who had been competing for as many years as she has been alive.

Her win in Friday’s slopestyle contest ranked as the first-ever Winter X Games medal for Estonia, where she rides a 100-meter hill near her home.

“It is hard there because we don’t have mountains,” said Sildaru, who travels across Europe to ski in the winter.

She said she was nervous Friday, but when asked how she dealt with her nervousness, she just giggled and pointed to her Red Bull helmet.

“That’s in your head,” she said.

She didn’t appear nervous on course. She spun in four directions on Friday, delivering the variety and difficulty judges want. Her first of three runs ranked as the best, earning her 93 points that survived the best women freeskiers in the world.

Norway’s Tiril Sjastad Christiansen earned silver and her teammate Johanne Killi took bronze.

“This was the toughest competition we have ever had in ski slopestyle,” said Christiansen, who added that Sildaru is an inspiration.

“I have been watching her since she was even younger than this,” said Christiansen, who stomped a switch 1080 on the final hit. “She just makes me a better skier and I want to push myself even harder when I see her ski.”

Snowboarding phenom Chloe Kim was 13 years, 9 months old when she won halfpipe silver in the 2014 Winter X Games. Sildaru’s gold ranks as the second-youngest medalist in Winter X Games history but the youngest ever Winter X gold medalist, beating Kim who won gold last year at 14.

Snowboard slopestyle: Earlier in the day, veteran boarder Spencer O’Brien ended her 10-year X Games gold drought with a 90-point run to win slopestyle.

The 27-year-old O’Brien edged four-time X Games gold medalist Jamie Anderson in the eight-woman finals. O’Brien’s winning 91-point run run included a switch, backside 720 and finished with a frontside 720.

After struggling on her first two runs, Anderson put down an 89-point run, just missing O’Brien. Anderson, who never has missed the podium at X Games, also threw a couple of 720s with a big backside rodeo in between.

Anderson’s silver is her 11th X Games medal. Rookie Hailey Langland, 15, of California picked up bronze in her first trip to X Games with her 88-point second run.

“It’s hard to deal with pressure and nerves and energy,” said Anderson, riding in her second competition since returning from a broken collarbone that left her laid up for four weeks. “I was struggling on my first couple of runs. Didn’t feel really solid. On the last run I decided to try something new that I knew could potentially take the gold if I did it good. And, I would say I did it 85 percent, and that’s it. I have really got to be my best. I used to be able to ride 85 percent and win. Now, I need to ride 100 percent and do it perfect to get that top spot.”

Flying big: Canadian Olympic snowboarders Max Parrot and Mark McMorris battled in Friday night’s big air throwdown, throwing dueling triple corks with varying degrees of rotation in a 25-minute flurry of snowboarding’s biggest tricks.

McMorris, the defending big air champion, tried his first-ever tricks like triple-cork 1620s and even a triple-cork 1800, but struggled to stay clean on his landings as he pushed to match his Olympic teammate’s flawless backside triple 1620.

Parrot bested McMorris to steal big air gold, his second since 2014, when he won both snowboard slopestyle and big air. McMorris, who won both big air and slopestyle last year, won silver, his fourth Winter X silver medal.

Japan’s Yuki Kadono, who won bronze last year and silver in 2014, took bronze.

Back for gold: Joe Parsons, the most decorated snowmobiler in X Games history, claimed his fourth X Games gold medal in the return of snowmobile freestyle before an electrified crowd.

The 28-year-old from Washington state threw the rare sit-and-spin trick, which is a backflip where he spins and lands sitting backward, on his final run to lock in his 15th X Games medal.

He hadn’t thrown the trick in a year.

“It’s not a very fun trick to practice. It’s kind of an in-the-moment thing,” said Parsons, who last won snowmobile freestyle in 2009.

Idaho’s Heath Frisby won silver, claiming his 11th X Games medal in 11 X Games. Former snocross racer Brett Turcotte of Canada won bronze. Defending freestyle champion Colten Moore crashed twice on his two runs.

Storm’s acomin’: The schedule could get tricky for the X Games this weekend as the area is under a winter storm warning from 6 a.m. Saturday to 9 a.m. Sunday.

The National Weather Service is forecasting snow accumulations of 8-16 inches and winds 10-20 mph with gusts up to 45 mph. The heaviest part of the storm is expected to hit Saturday evening.

Saturday’s scheduled finals are the men’s snowboard slopestyle at noon and halfpipe at 6:15 p.m.; monoskier at 11 a.m. and skicross starting at 2 p.m.; and ski big air at 8:15 p.m.

Tim Reed, who oversees the day-to-day X Games operations, said Friday they have “flexibility to move some things around.”

“You know how it goes — you have a forecast, and then nothing happens,” Reed said. “So you kind of have to wait it out in real-time. There’s a million scenarios.”

The competition schedule for the 2016 Aspen Winter X Games at Buttermilk Mountain:

Saturday

11 a.m. Mono skier X finals

Noon Men’s snowboard slopestyle final

2 p.m. Men’s and women’s skier X heats, semifinals and finals

6:15 p.m. Men’s snowboard superpipe final

8:15 p.m. Ski big air final

Sunday

10 a.m. Men’s ski slopestyle final

10 a.m. Snowboarder adaptive X semifinals and final

Noon Men’s and women’s snowboarder heats, semifinals and finals

1:45 p.m. Women’s snowboard superpipe final