Dustin Johnson hits six-under-par 66 for share of Canadian Open lead

Reigning US Open champion Dustin Johnson fired a six-under-par 66 for a share of the lead at the Canadian Open at Glen Abbey Golf Club.

The 11-time winner on the PGA Tour made seven birdies, an eagle, a bogey and a double bogey to move into a tie at the top of the leaderboard with Luke List at the Toronto-area course.

"It's firm and fast," said world No 2 Johnson. "It's definitely tough to get the ball close to the hole. You've really got to land the ball on your numbers. With it being as windy as it was today, it was tough to do that."

Defending champion and world No 1 Jason Day opened with a three-under 69 and is three shots back of the leaders. He is seeking to become the first repeat winner of the Canadian Open since Jim Furyk in 2006 and 2007.

Johnson, who won the US Open last month at Oakmont, is Canada's adopted son as he is engaged to the daughter of Canada's greatest sports hero, NHL legend Wayne Gretzky.

List carded birdies on five of his first nine holes. He added another at the second hole en route to a bogey-free 66, matching his career-low round on the PGA Tour.

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"I was very fortunate that the first five holes there wasn't much wind at all and then it kind of picked up," said List, who is coming off missed cuts in five of his past seven starts.

Canada's Jared du Toit, Chesson Hadley, Kelly Kraft and Jon Rahm are tied for third after five-under 67s.

Du Toit, an amateur, eagled the par-four 17th hole, then made a birdie on 18. Hadley made six birdies and one bogey. Kraft played the six-hole stretch beginning at the 13th in six under par.

Rahm is hoping to become the first to win the Canadian Open in his debut since Chez Reavie in 2008.