Stenson, who won the 2013 FedExCup, headed American Rickie Fowler (67) by one stroke and was two clear of Australian Matt Jones (68) and American Sean O'Hair (67).
Stenson’s bogey-free round included an eagle at the short par-four fourth hole, where he drove the green and sank a slippery downhill 20-foot putt.
PGA Championship winner Jason Day's stretch of 22 consecutive rounds of par or better, the longest streak on the PGA Tour this year, ended when he stumbled to a 73.
(Reporting by Tim Wharnsby in Toronto. Editing by Andrew Both)
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