Perret and Rios secured their place in the final after defeating Canadian pair Kalynn Park and John Morris 7-4 and Hyeri Jang and Chiwon Cho of South Korea 8-1 today at Omaha’s Ralston Arena.

The pair have qualified from Group A with a game against Sweden still to go. 

"It feels great, step one is complete," said Rios.

"We still have to improve, we don’t want to lose focus tomorrow against Sweden. 

"We need to give all we have in the remaining two games, try our best and see what happens."

The finalist from Group B of the mixed doubles is yet to be decided, with all four teams still able to progress.

Norway's Kristin Skaslien and Magnus Nedregotten currently lead, with the pair today winning against the United States 6-4 but then losing to Russia 8-6.

America's Tabitha Peterson and Joe Polo are only one point behind in second place after a 8-7 one-stone shoot-out victory against China. 

Wang Rui and Ba Dexin are then another point behind in third, beating fourth placed Russia 11-4.

There was a shock exit for Olympic champions Sweden in the women's competition, with a 5-4 defeat to Japan cancelling out their earlier 7-3 victory over China in Group B. 

Japan are in pole position to qualify from that group, sitting in first place with 12 points after beating Scotland 7-6.

Scotland's 10-3 win against China keeps them in contention for a place in the final but resigned China to an early tournament exit.

South Korea triumphed against Russia 6-2 and the US 8-7 to end the day joint top of Group A with Canada, who defeated the same teams 7-5 and 7-6. 

In the men's tournament, the US went top of Group A with a narrow win against China 6-5 and Sweden lead Group B after comfortably beating Japan 7-2. 

Switzerland defeated Norway 6-5 and Scotland triumphed against Canada 7-5 to keep themselves in contention for progression from their respective groups. 

The finalists of all three disciplines are set to be determined tomorrow with the conclusion of the round-robin competition.