The only country to have beaten one of women's hockey superpowers, the United States and Canada, in Olympic competition, Sweden shocked the Americans 3-2 in the semi-finals in Turin in 2006 to claim an unlikely silver medal.
A hard-fought win over Japan, who were making their first return to the Olympic stage since hosting the 1998 Winter Games, was a cautious first step for the Swedes.
Swedish netminder Kim Martin Hasson, who played in the landmark win over the United States, made 19 saves to collect the shutout and captain Jenni Asserholt scored the only goal.
(Reporting by Steve Keating, Editing by Ed Osmond)
