Rory McIlroy failed to build on his first round exploits but remains bang in contention after a second round 71 at the Wells Fargo Championship at Quail Hollow, the scene of his first US PGA triumph back in 2010.
Englishman Lee Westwood surged up the leaderboard after a four-under-par 68 on day two in North Carolina but Ryder Cup teammate McIlroy failed to build on his opening round.
Westwood moved onto six under overall, alongside McIlroy, although it could have been even better had he not bogeyed three holes from the end.
He made a fantastic start to his round with a birdie on the par-five 10th, although he dropped a shot on his third.
A run of five birdies in eight holes briefly took him to the top of the leaderboard before he dropped back after he could only manage a bogey-six on the seventh.
McIlroy, who was in a share for the lead on five under overnight, also started on the back nine but dropped two shots to approach the turn in 38.
But the Irishman's fortunes changed thereafter.
Birdies at the first, fourth and eighth holes ensured he remained firmly in the hunt at the halfway stage.