Seamus Power is in touch with the leaders following the first day of the Canadian Open after carding a bogey-free four-under-par 68 on Thursday.

American Robert Garrigus holds the clubhouse lead after carding five straight birdies from the second hole on the way to an error-free nine-under 63 before play was suspended for the day due to dangerous weather at Glen Abbey.

As good as Garrigus's round was, the 40-year-old American believedd it could have been better, even historic, believing that with a bit more luck he could have flirted with a 59.

Instead Garrigus's brilliant round added up to no more than a one-shot clubhouse lead over Adam Schenk, who birdied his closing three holes, while fellow American Chris Stroud lurked one shot further back by finishing with four straight birdies.

Ian Poulter, Hudson Swafford and Byeong Hun An all finished a shot further back, while Kevin Tway was also sitting on six under with three holes left to play.

"Could have been 59 watch there if a couple putts didn't lip out," said Garrigus, who has just one top 10 result this season and missed the cut in 11 of 24 starts.

"Lipped out on 10, I had a lip out on 17. Got lucky on the par five 13th, hit right into the middle of the water and hit a rock and bounced over the thing and I made a birdie."

World number one Dustin Johnson, looking to bounce back after his first missed cut this year at the British Open, shot a rollercoaster 68 that included an eagle, six birdies and four bogeys to leave the big-hitter five off the early pace alongside Power.

"There was some really good stuff and some not so good stuff," said the American, who has already picked up two wins this season. "Missed a couple of short putts early in the round, had a couple of three putts on the back nine.

"All-in-all it was a pretty good day just a few loose shots. Every time I was out of position I made a bogey but I made a bunch of birdies and an eagle."

Sergio Garcia in action in Canada

Johnson's playing partners, Canadian Adam Hadwin and twice US Masters champion Bubba Watson, recorded 70s.

One-over through 12, Watson turned things around with three birdies over the next four holes to avoid a disastrous start.

The early starters were greeted by ideal scoring conditions but had to endure some heavy rain.

Play was suspended due to the weather at 4.30pm ET (9.30pm Irish time) and resumed just over two hours later. It was stopped again for the day at just after 8pm ET (1am Irish time).

The round is due to resume at 7am ET (12pm Irish time) on Friday, with round two scheduled to get under way half an hour later.