After 12 days and 24 electric matchups, the Olympic women’s hockey semifinals are officially here. Only four of the original 10 teams remain in the tournament: the United States, Sweden, Canada, and Switzerland. After Monday’s action, only two will remain.

Team USA has looked like a force of nature so far in the tournament, marching to one inevitable win after another. In five appearances thus far, the U.S. has yet to score less than five goals in a single game. After allowing a single goal in the opening game versus Czechia. The U.S. defense has been impenetrable. They currently ride a four-game shutout streak.

“You can't really shake us. We are going to keep going, we know what our goal is, and you are not going to get us knocked off course by any means,” forward Joy Dunne said after the team’s quarterfinal victory over Italy. “The experience we have in our locker room reminds us that we are here for bigger things right now."

Bigger things for the United States, however, will have to go through a Swedish team that has put on a statement performance in the tournament thus far. Unlike the U.S., where Olympic medals are expected, Sweden’s team hasn’t won a medal since 2006 (silver) and hasn’t made the semifinals since 2014.

They entered this tournament riding a wave of young player development — a strategy which has clearly paid off, carrying them to an undefeated run coming into the semifinals.

"I think we proved we can beat almost every team here, and we have a really good group. Everyone loves each other in this group,” forward Hilda Svensson said after the team’s quarterfinal win. "Our goal in the tournament is to take a medal, so we are going to give everything we have in us to try and win that medal.

The face-off has all the makings of an instant classic. The U.S. has a goal differential of 26-1, while Sweden’s is 20-2. Neither team has allowed a goal since Feb. 7 or before. However, both defenses will be put in the spotlight. Being able to stop these high-powered offensive machines will prove critical to grabbing the finals spot and guaranteeing themselves an Olympic medal.

Taking center stage in the second semifinal tilt of the women’s tournament will be Canada and Switzerland. Both teams have faced adversity in the tournament’s early stages: unlike the U.S. and Sweden, both Canada and Switzerland each carry a group stage loss into the semis.

For Canada, losing captain Marie Philip-Poulin for two games to a knee injury put the team on their heels. While the roster rallied around their captain, they felt her absence in the loss to the United States on Feb. 10. They also felt her quarterfinal return, where she not only retook the ice, but also tied the all-time Olympic record for most goals in women’s hockey history. 

“I just wanted to be back on the ice with the girls. It's truly a special group. … You never want to be on the sidelines due to injuries,” Philip-Poulin said after the game. “It felt good and happy to [tie the record]. I'm happy, but there's still work to be done and go from there.”

On the Swiss side, things have been a little bumpier. The team opened the tournament with a narrow, shootout victory over Czechia, and lost 3-1 to Finland in their final group stage contest. However, they avenged that loss and defeated the Finns 1-0 in the quarterfinals with a late second-period goal and a 40-save shutout performance from goalie Andrea Braendli.

Canada and Switzerland have already met once this tournament during the group stage: a game that ended with a 4-0 Canadian win. The Swiss aren’t worried about a repeat performance.

“Coming out of disappointments just makes you stronger. Just wanting to finish on top, that's what we're here for,” forward Alina Muller said. "We did a really good job for two periods in the preliminary round against them. … If one puck bounces in, the game looks different. We don't have to hide. We can just play freely."

The U.S. and Sweden will face off Feb. 16, at 10:40 a.m. ET, while Canada and Switzerland will drop the puck later in the day at 3:10 p.m. ET. Watch both games live on NBCOlympics.com and Peacock.