Brian Gay shot a 67 and increased his lead to three shots after three rounds of the Verizon Heritage on Saturday.
Gay moved in front Friday with five straight birdies. This time, he played steady, mistake-free golf at Harbour Town Golf Links to move to 13-under.
New Zealand left-hander Tim Wilkinson shot a 65 and was three shots back.
Two-time U.S. Open winner Lee Janzen maintained his place among the leaders, another stroke behind after a 69.
Todd Hamilton, the 2004 British Open champ, was a stroke behind Gay when the round began. However, he fell five shots behind after his even-par 71.
Five-time Verizon Heritage winner Davis Love III (69) was tied with Briny Baird (65) at 7-under.
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