KRASNAYA POLYANA, Russia — There will be only two Americans among the 12 snowboarders vying for a medal in the finals of the women’s slopestyle event. Jessika Jenson and Ty Walker both failed to advance out of the semifinal round of the competition Sunday morning. Their teammates, Karly Shorr and medal-favorite Jamie Anderson, both qualified for the finals on Thursday.

In the semifinal round, 12 riders were battling for one of four spots into the finals. The pressure was on Jenson. By the time it was her turn on the second run, she stood in fifth place and needed to leap-frog at least one other foe — and fend off three remaining riders — to make the top four. She was clean on the rails and landed two safe jumps, but she fell on the last and couldn’t top her score from the first run. Her mark of 72.0 was good enough for fifth place on the day and 6.75 points away from advancing.

Walker, who at 16 is the youngest member of the U.S. snowboard team, suffered some bumps and bruises in a training run early in the week and used crutches to get through Friday’s opening ceremony. In the qualification round, she opted against attempting a single trick. She rode through pain Sunday and posted a strong score of 66.o on her first run, which put her in fifth place midway through the semis.

She needed a big second run to crack the top four but failed to land her final jump of the day, which resulted in a score of 43.75. Walker finished the competition in sixth place.

The finals begin shortly at the Rosa Khutor Extreme Park (1:15 p.m. in Sochi, 4:15 a.m. in Washington). Advancing out of the semifinal rounds are: the Czech Republic’s Sarka Pancochova (90.5), Switzerland’s Sina Candrian (84.25), Great Britain’s Jenny Jones (82.25) and Norway’s Silie Norendal (78.75).