Daniel Berger shot an 8-under par 62 on Saturday, two strokes off the course record, to take a three-stroke lead into the final round of the Travelers Championship.
The 23-year-old Floridian made nine birdies, including seven on his final 10 holes Saturday, to finish with a 15-under par 195 after 54 holes.
Russell Knox, who opened his round with three straight birdies, shot a 64 and was tied with Russell Henley and Tyrone Van Aswegen for second place at 12-under par.
Berger, who is coming off a shoulder injury, is looking for his second career title on the PGA Tour. He won two months ago in Memphis at the St. Jude Classic.
The golfers went out early in trios Saturday off the first and 10th tees to avoid thunderstorms predicted for the area.