Canada scored twice in the second period and held off the United States for a 2-1 win in women's hockey action at the Olympics in Pyeongchang.
Geneviève Lacasse was outstanding, making 44 saves.
Meghan Agosta and Sarah Nurse both scored in the second period to give the Canadians a 3-0 record in the preliminary round. Kendall Coyne was the lone goal-scorer for the Americans, who dropped to 2-1.
There was some consternation at the end of the game, with the U.S. swarming the Canadian net as the final horn sounded.
The resulting scuffle was a microcosm of the rough showdown between archrivals.
Both countries had already booked berths in Monday's semifinals having won their first two games in Pool A.