Lowry, meanwhile, sputtered down the stretch. After making birdies on the 15th and 16th holes to take a two-stroke lead over the field, the Irishman had bogeys on his final two holes — both times missing 10-foot putts — to drop him back behind the leaders.
“Felt like I had the ball on a string all day and felt like it came very easy to me today,” Lowry said. “Just to bogey those last two was disappointing.”
Dustin Johnson shot a 67 to sit two strokes off the lead with Thailand’s Prom Meesawat.
Defending champion Martin Kaymer was in a group of seven golfers tied for ninth at 4 under, along with England’s Luke Donald and American Jason Dufner.
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