View gallery
Charlotte (AFP) - Webb Simpson fired seven birdies in a five-under 67 to grab a share of the lead alongside Robert Streb at Quail Hollow, where world number one Rory McIlroy was poised for a weekend push.
Simpson's second straight 67 gave him a 10-under total of 134, tied with first-round leader Streb, who carded a 69.
They were two strokes in front of Americans Martin Flores and Patrick Rodgers, Flores posting a 67 and Rodgers a 68 for eight-under 136.