Haven, Wisconsin: Scott Piercy was the latest new name atop the PGA Championship leaderboard on Friday, joining overnight leader Dustin Johnson on six-under early in the second round as David Lingmerth faded.
Lingmerth, who started the day one adrift, had gone two strokes clear after birdies at three of his first five holes with Johnson still to tee off at Whistling Straits.
But the Swede`s fortunes changed abruptly with a double-bogey at the par-three seventh followed by bogeys at eight and nine.
Piercy began the day in a group of eight players who were two strokes behind Johnson.
He opened with a birdie and picked up another stroke at the par-five fifth.
Masters and US Open champion Jordan Spieth was also gaining ground after an opening 71. Spieth holed out for birdie from a bunker at his ninth hole, the 18th, and was three-under for the day through 10 to lie two strokes off the pace at four-under for the tournament.
World number one and defending champion Rory McIlroy was going the other way after a double-bogey at the 18th that left him at even par for the tournament through 10 holes.
With the winds expected to kick up again in the afternoon, Dustin Johnson was due to tee off at 1:20 p.m. (18:20 GMT).
Tiger Woods, trying to rebound from a first-round 75 and avoid missing the cut at a third straight major, was to tee off at 1:30 (18:30 GMT).