Olympics Live Updates: Mikaela Shiffrin Fails to Finish Her Best Event

ZHANGJIAKOU, China — The icy halfpipe yawned on the mountainside, waiting to be awakened by the world’s best snowboarders on Wednesday at Genting Snow Park.

And with them came Chloe Kim, the defending gold medalist from the United States, hoping to soar through the qualification round and into Thursday’s 12-women finals.

Kim was the second of 22 competitors to drop in for the two-run qualification, where only the better of the two scores counted. She scored an 87.75, almost guaranteeing a spot in the next day’s final.

Kim fell on her second run, under-rotating and slipping, but it did not matter. Her solid first run was more than enough to carry her to the finals as the favorite for the gold again.

Snowboarding’s halfpipe competition is one of the showcase events for the Winter Olympics, at least for American audiences curious to see what Kim will do next, and what Shaun White might do last.

White, now 35, is competing in his fifth and final Winter Olympics, searching for his fourth gold medal. He and the other men were scheduled to go through their qualifications later on Wednesday.

The morning belonged to the women. Each of the 22 competitors were allowed two runs down the pipe, with its 22-foot walls. The best of their two scores, judged by an international panel, was used to rank them.

The top 12 advanced to ride for medals the next day. Kim, 21, won the gold medal four years ago in Pyeongchang, South Korea. A year later, burned out and pondering retirement, she left the public eye and went to Princeton for a year of college. She went 22 months without stepping on a snowboard, the longest break since she began riding as a toddler.

She returned to competition a year ago, though, independent, refreshed and as dominant as ever. She arrives in China as the favorite to win again, though the competition appears to have crept closer to Kim’s level. ‘

Among those who think they can beat her are Maddie Mastro, 21, a fellow Californian, and a pair of veteran Chinese riders: Liu Jiayu, 28, and Cai Xuetong, 27.

Liu was the silver medalist four years ago. Cai was fifth. Liu fell on her first run, the first run of the competition, catching an edge off a relatively easy maneuver.

Kim followed, a bit tentative, perhaps, from what she had witnessed from her rival, but still received a strong score.

On the men’s side, White has a habit of stealing the spotlight, thanks to three Olympic gold medals and a disappointing fourth-place finish in 2014.

This time, he comes in as a 35-year-old underdog, but one motivated by knowing that this will be his last Olympics, and maybe his last competition.

Making the podium is a possibility, but so is failing to reach the final at all. No one has raised the profile of halfpipe snowboarding more than White, with his Olympic success, mainstream popularity and steady progression of tricks.

He will struggle to keep up, however, as several riders, most of them from Japan, could pop triple corks — tricks with three off-axis rotations in the mode of a corkscrew. Plopping a big trick like that in a steady run certainly would send a rider to the final. Doing it there could land a medal.