The red-hot Kevin Kisner has his best round to date, a 7-under 64, to increase his lead to three strokes at the RSM Classic on Saturday in Sea Island, Georgia.
Kisner had seven birdies, including three straight to end the round, moving ahead of Kevin Chappell, who had entered the day with a 3-stroke lead.
Hot on his heels is the resurgent Graeme McDowell, who won the OHL Classic a week ago, his first win on US soil in close to three years.
McDowell fired a 65, the second-best round besides Kisner, to drop to 12-under, one stroke behind Chappell. McDowell played a bogey-free round with five birdies.