Unbeaten United States and Norway top groups at halfway stage
Canadian pairs also pick up wins on second day in Beijing.
Norway and United States maintained a perfect record in the Curling World Cup Grand Final after registering two wins on day two to top their respective groups.
In a repeat of their final in Omaha, Sarah Anderson and Korey Dropkin gained revenge as they battled past Laura Walker and Kirk Muyres of Canada to win 8-7 in the first session of the day.
The American duo also beat hosts China (Cao Chang and Yuan Mingjie) 13-4 on day two to retain their unbeaten start in Beijing.
Nedregotten and Skaslien built on their fine victory on day one by producing a controlled display to beat Russia’s Maria Komarova and Daniil Goriachev 10-3 in the opening session to set up a match against their Omaha final opponents Switerland.
The Norwegian couple went on to beat the Swiss team, despite being down 3-1 at the fourth-end break, to win 7-6.
"We felt awake out there today. We are handling the conditions very well and doing the regular things with our communications. It's hard to tell you exactly what is making us perform like this," said Nedregotten.
"We really enjoy ourselves. We did not have the best World Mixed Doubles Championship -not much going our way but here we have loosened up a little bit and focusing on having fun. We want to show what we can do."
Perret and Rios did appear to find their groove earlier on inside the Shougang Arena as they defeated Jonkoping leg winners Kadriana Sahaidak and Colton Lott 10-4 inside seven ends, which was their first win of the week.
Canada’s Walker and Muyres bounced back from their earlier defeat against United States to edge out Switzerland’s Michele Jaeggi and Sven Michel via a shoot-out, with Muyres draw just 5.9cm away from the button - 165.9cm closer than Michel's shot.
Elsewhere, China’s mixed doubles team got their first win on the board with a 9-7 success over 2018 world champions Michele Jaeggi and Sven Michel.
After suffering defeat in their morning encounters, Sahaidak/Lott and Komarova/Goriachev met in the afternoon session with the young Canadian couple recording their first win of the competition.
Despite being down 5-4 with two ends remaining, the pair secured back-to-back steals of one to get on the board.
"We were praying for a miss in the last end and we are improving each game as we keep gaining information on the ice," said Lott. "It's nice to finally get a W in the column."
Sahaidak added: "Beijing has been great. We have spent a few days and tour round the city to see the Great Wall of China and the Forbidden City."