Marie-Philip Poulin scored twice and had an assist for Canada in a 9-0 win over Japan at the women's world hockey championship Sunday.

Victoria Bach also had a three-point game for the defending champions with a goal and two assists.

Emma Maltais, Ella Shelton, Blayre Turnbull, Jamie Lee Rattray, Sarah Fillier and Sarah Potomak each contributed a goal to Canada's third straight win to start the tournament.

In her first start, Emerance Maschmeyer didn't handle a shot until the final minute of the second period and repelled the five she did face.

Japan starter Akane Konishi stopped 28 of 32 shots before she was relieved by Riko Kawaguchi midway through the second period of the first game between the two countries in 22 years. Kawaguchi made 22 saves.

Canada caps the preliminary round Tuesday against the U.S., which is unbeaten after two games and meets the Swiss on Monday. The top four teams in each pool advance to Thursday's quarterfinals.