Canadian skip Jeff Stoughton, right, delivers a rock during his Draw 6 win over South Korea. ((Jonathan Hayward/Canadian Press))

Canada stayed out front at the Ford World Curling Championship on Monday, but Jeff Stoughton's undefeated team had company.

Stoughton came from behind for a 5-3 win over Pete Fenson of the U.S. in the late draw after beating South Korea 7-4 earlier. Stoughton's second win moved Canada into a tie for first with Scotland at 5-0.

The Americans, leading 3-2 after four ends, mounted a ferocious defence with their hitting game. Canada blanked the next three ends because they couldn't set up a multi-point end.

Stoughton, curling 100 per cent through seven ends, was forced to draw for a point in the eighth. Canada then stole single points in the ninth and 10th ends for the win as Fenson was heavy on his final draws.

Canada takes on Thomas Dufour of France (4-1) and the Scots on Tuesday.

Sweden's Niklas Edin and Switzerland's Christof Schwaller were tied at 3-2, followed by Jiri Snitil of the Czech Republic, Germany's Andy Kapp, Norway's Thomas Ulsrud and China's Yansong Ji all at 2-3. South Korea's Dong Keun Lee was 1-4 ahead of Tommy Stjerne of Denmark at 0-5.