OAKVILLE, Ontario — Dustin Johnson started and finished the day tied with Luke List for the Canadian Open lead. The U.S. Open champion had to make up a lot of ground to do it.

Johnson had a double bogey and two bogeys on his first holes Friday in windy conditions at sun-baked Glen Abbey. He rebounded with six birdies and had a late bogey in a 1-under 71.

“I really don’t know what happened the first four holes,” Johnson said. “Just got off to a bad start. Hit it in a couple awkward spots. Made some bad bogeys, but fought back and turned it around and felt like I played really nicely from 14 on in.”

Johnson played in the morning after eagling the par-5 18th late Thursday afternoon for a 66.

“The wind today almost feels like it’s a little bit heavier and it’s affecting the ball a little bit more, and it’s a little bit different direction,” Johnson said. “You’ve just got to take advantage of the downwind holes and the into-the-wind holes, just try to get looks.”

List also shot a 71, birdieing the par-5 16th and 18th after making three bogeys in a four-hole stretch early on the back nine.

“Real happy the way I finished up,” said List, winless on the PGA Tour. “It was kind of a battle the middle of the round there and definitely pleased with the way I finished on the two easy par 5s.”

Canadian amateur Jared du Toit, former Arizona State teammate Jon Rahm and Kelly Kraft were a stroke back, also each shooting 71.

Du Toit made the turn tied for the lead at 7 under, then had a triple-bogey 8 on No. 2 and a bogey on No. 5. The Sun Devils senior birdied the next three holes and closed with a par.

“Taking an 8 always hurts, but I just kind of stayed patient,” said du Toit, from Kimberley, British Columbia. “The putter heated up at the right time, and it was all good. Nothing but good things to say.”