Muirhead - who has already secured selection for next year's Olympics in Sochi - is looking to regain the title she won in 2011 and upgrade her Scottish rink's silver 12 months ago in Karlstad.
She gained revenge over Russia in a repeat of last year's final in her opening match and also recorded wins over Latvia and Germany with six round-robin matches still to play before this weekend's medal matches.
David Murdoch's Scottish men's rink had a more stuttering start to their campaign, winning two and losing two in their opening four encounters.
Two-time Olympian luge slider Adam Rosen finished 24th in the second World Cup of the season in Igls, completing his two runs 1.337 seconds slower than winner Felix Loch.
Meanwhile, Harry Foulkes and Raymond Thompson ranked 36th and 48th in the Nations Cup event, with Rosen's 16th place qualifying him for his World Cup run of the season.
As the biathlon World Cup season starts in Oestersund, Scott Dixon's 84th place in the 10km sprint at the IBU Cup in Idre secured a British men's relay team at the forthcoming World cup events in Hochfilzen and Annecy.
Britain's Nerys Jones came home 29th in the women's 7.5km sprint, just two places and one second ahead of team-mate Amanda Lightfoot. Lightfoot didn't start the second race, in which Britain's Adele Walker ranked 64th.
Lamin Deen and Toby Olubi secured bronze in the fifth race of bobsleigh's America's Cup series while Youth Olympic silver medallist Mica McNeill and Sarah Adams ranked fifth in the women's race in Utah.