The quartet all now sit on three wins and zero losses at TD Place in the Canadian capital to share pole position in the standings.

In the final session of the day, the Norwegians snatched victory away from the host nation as they prevailed 8-6.

They found themselves 6-4 down going into the ninth end before skip Magnus Ramsfjell led his side to four unanswered points which sealed the win late on.

Norway also started the day with a more straightforward 6-2 win against South Korea, who decided to throw in the towel after the eighth end.

Four-time defending champions Sweden began day two in style with a win against the United States in a high-scoring affair that ended 11-6.

Niklas Edin's team then inflicted a first defeat to European champions Scotland in the afternoon's play.

It was a back-and-forth game before the Swedes recorded a three-point haul in the ninth to put the game to bed with a 7-4 victory.

Switzerland, whose women's side won the World Championship last month, are also in the running for the men's title.

Their outfit downed the Czech Republic 7-4 in the opening session before cruising past Germany 7-3.

Japan represent the only other undefeated team after they dominated South Korea 9-2 and pulled off a narrow 6-5 win against the US.

A three-point seventh end proved vital as it meant they were able to hold off three consecutive scoring periods from the Americans.

It was a third straight defeat for John Schuster's US who are joint-bottom alongside Turkey and New Zealand.

The action is set to continue tomorrow in Ottawa with Switzerland opening the first session against Italy, while Sweden play South Korea and the Czech Republic face the US.