Argentina's Emiliano Grillo shoots 8-under 64 to take Canadian Open lead

Emiliano Grillo from Argentina hits on the 9th fairway during first round of play at the Canadian Open golf tournament Thursday, July 23, 2015, in Oakville, Ontario. (Paul Chiasson/The Canadian Press via AP) (The Associated Press)

Emiliano Grillo from Argentina lines up his putt on the 9th green during first round of play at the Canadian Open golf tournament Thursday, July 23, 2015, in Oakville, Ontario. (Paul Chiasson/The Canadian Press via AP) (The Associated Press)

Argentina's Emiliano Grillo shot a bogey-free 8-under 64 on Thursday to take the first-round lead in the Canadian Open.

The 22-year-old Grillo birdied three of the four par 5s at Glen Abbey. He won the Argentine Open last season for his biggest career victory, and lost in a playoff this year in the Puerto Rico Open.

Vaughan Taylor and Brian Harman were a stroke back. Two-time heart transplant recipient Erik Compton was at 66 along with Steve Wheatcroft, Tyrone Van Aswegen and Australian amateur Ryan Ruffels.

Jason Day, coming off a tie for fourth Monday in the British Open, opened with a 68.

Former Georgia Tech player Ollie Schniederjans had a 71 in his pro debut. He tied for 12th in the British Open.

South Africa's Tim Clark, the winner last year at Royal Montreal, shot a 72.