"Life's short so, whatever, I'm just going to have some fun", said Hughes, who donned a Toronto Maple Leafs jersey at last year's version of the Rink at Glen Abbey Golf Club in Oakville, Ontario.
Bradley, the 2011 US PGA Championship victor, only added the event to his schedule at the last minute and said he produced one of his best displays of ball striking this year.
World No. 2 Dustin Johnson had some struggles during his round, shooting a 1-over 71.
"I liked the way I was hitting the putts, liked the way I was driving the ball, iron play was really good", Koepka told Golf Channel.
One problem for Johnson, Koepka and McIlroy is that none of them had a chance to play a full practice round.
"I like the front nine". Only happens rarely. Can only think of a couple events I've seen that. "(Austin) went out Tuesday and kind of looked at it.
Last but certainly not least among the Canadian contenders after the first round is Mackenzie Hughes.
"I was six under through 17 and it was pretty stress-free for the most part", Hughes said, noting he'd have to get over his double-bogey finish quickly. "There's an added comfort level, just knowing the course and knowing what to expect", said Conners. "I'm happy with how I played with Pebble Beach next week". "Nothing changes. I'm here to win, but I got to take it one step at a time".
Play at the tournament was halted at 12:10 p.m. for approximately three minutes as planes from the Canadian Warplane Heritage Museum and current RCAF 8 Wing based aircraft from 429, 436 and 437 squadrons flew over the course.
On top of the 20 that were announced in the final field on Friday, James Allenby of Langley, B.C., Thomas DeMarco of LaSalle, Ont., Etienne Brault of Mercier, Que, and Toronto's JC Deacon all qualified on Monday at Heron Point Golf Links in Alberton, Ont.
"We all obviously want to be the first one to win this, but we all want each other to do well", Hadwin said. "Until one of us does that, I think it's going to hold a lot of value for us".