American Matt Kuchar rolled in three straight birdies on his back nine in Friday's second round to take a three-shot lead at the weather-hit 92nd PGA Championship.
The 32-year-old fired a five-under par 67 in the first round, which finished up Friday morning after opening-round play at the season's final major was called off because of darkness on Thursday.
Dense fog Friday morning caused more problems as the first round of the 7.5 million-dollar event didn't resume until after a delay of two hours and 40 minutes.
It is the second day in a row that fog has delayed the start of play at the Whistling Straits course on the shores of Lake Michigan.
Weather forecasters are predicting rainstorms later in the day that could prevent groups with late tee times from starting their second rounds.
Tiger Woods, who shot a 71 in his opening round, is in the hunt and has a late afternoon tee time.
Bryce Moulder, playing in the group in front of Kuchar, is two shots back at six-under.
England's Simon Khan finished with a three-under 69 in the opening round. He eagled the par-four sixth hole in the second round to move to six-under but gave one back with a bogey on No. 8.
South African Ernie Els was in a large group of players who shot a four-under 68 in the first round. Els, who had two wins in March, had a bogey-free opening round with birdies on holes number one, four, five and 11.
South Korea's Noh Seung-yul is also near the top of the leaderboard at five-under through 14 holes of the second round.
Els three putted the final hole the last time the PGA Championship was at Whistling Straits in 2004 to just miss joining eventual winner Vijay Singh and two others in a playoff.
"I played well here last time," Els said. "I am reading the greens quite well. We will see how it goes."
Noh, who is playing in his first PGA Championship, became the second youngest winner in European Tour history earlier this year by winning the Malaysian Open.
"I am so happy," the 19-year-old Noh said between rounds Friday. "I came here as an invitee and I wanted to play as well as I can. I won the Malaysian Open and that gave me a lot of confidence."
Noh is playing in his third major of the season. He tied for 40th at the US Open but missed the cut at the British Open at St. Andrews.
The players picked up where they left off at 9:40 am (1440 GMT) with Khan's group having the most work to do after getting through just seven holes of their opening round on Thursday.
Kuchar said he had a sleepless night waiting for his round to restart.
"I just don't feel good when I wake up after five hours sleep. My body just feels funny," he said.
Copyright 2010 AFP Global Edition
