Dustin Johnson has a one-shot lead at the Memorial Tournament in Ohio after a carding an eight-under-par 64 in the first round on Thursday.
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The 31-year-old American shot 10 birdies, four of which came consecutively on the back nine, and suffered just two bogeys on the course.
Brendan Steele is the closest challenger on seven-under-par after shooting 65, including an eagle on the 18th hole, while world number one Jason Day is two shots off the pace.
Rory McIlroy carded six birdies, but he dropped a shot on the fourth, seventh and 10th holes before suffering a double bogey on the 16th to leave him seven strokes behind.
Jordan Spieth, who is ranked second in the world, finished the day with a two-under-par 70.
