Dustin Johnson holds a share of the lead at the RBC Canadian Open as Jason Day made a mixed start to his title defence.
U.S. Open champion Johnson continued his good form, carding a six-under 66 in the opening round in Oakville, Ontario on Thursday.
The American, who has top-10 finishes in his past five starts, finished with an eagle at the Glen Abbey Golf Course to share the lead with Luke List.
Johnson had an eagle, seven birdies, a bogey and a double bogey throughout his first round.
How did DJ eagle the 524-yard par-5 18th ...-- PGA TOUR (@PGATOUR) July 21, 2016
Driver, gap wedge, putter. https://t.co/n1uPbmitUr
List was far more consistent, producing a bogey-free round to sit alongside Johnson atop the leaderboard.
World number 309 List has missed 10 cuts in 19 events this year, but believes he has turned that around.
"I think a couple of those missed cuts were pressing too much and just putting too much pressure on myself. I've been playing well relatively all year," he said.
"Missed a lot of cuts by one or two, and sometimes that's the way it goes. I've been trying to work on my head a little bit and get a good frame of mind for the end of the year."
Day, the 2015 champion and world number one, was tested on his first nine holes, mixing three birdies with two bogeys.
The Australian had an eagle at the par-five second before a birdie at the fourth, but a bogey at the seventh saw him slip back to a tie for 11th.
Chesson Hadley, Kelly Kraft, Jon Rahm and amateur Jared du Toit carded five-under 67s to be a shot off the lead.
Brandt Snedeker, Brendon de Jonge, Cameron Tringale and Steve Wheatcroft are at four under.