Duke shot 65. This is the first time Duke has started the final round with at least a share of the lead in 488 starts in PGA Tour-sanctioned events. He and Triplett were at 6-under 134.
Scott McCarron, the Charles Schwab Cup leader, had a 68 and was tied for 14th, though he was only four shots behind. The leading eight players were separated by just two shots going into Sunday.