"It felt kind of natural, I hit pretty good shots and really only holed two long ones which were the last birdie of the nine on 15 and about a 20-footer on 11.
"Apart from that I just hit them pretty close and felt like I had a good idea of what the ball was going to do on the green today again which was nice."
Englishman Willett hit six birdies and a bogey in his 67 to sit at 11-under, two shots clear of Frenchman Mike Lorenzo-Vera and American David Lipsky.
Lorenzo-Vera sank six birdies and an eagle in his 65, while Lipsky was bogey- free in his 67.
Scotland's Marc Warren surrendered his overnight lead with a three-over round of 75, following three bogeys and a triple bogey on his last six holes.