Meanwhile, Webb Simpson keeps making birdies. He got to seven-under for the day and five-under through the tournament, just two shots behind Scott with three holes left, before bogeying the 16th hole to fall three back. He still has a shot at the course record of 63 if he can finish with a birdie and a par in some order.
Jim Furyk, who was tied with Scott for the lead, is still over 40 minutes from beginning his second round. Rose birdied the par-four fifth hole (his 14th) to get to four-under and stay three shots behind leader Scott and tied for third.
Tiger Woods is on the practice putting green, getting ready for his 10:45 a.m. PDT tee-off.
Scott took a three-shot lead with a birdie on the par-three sixth hole to get to eight-under (it’s Scott’s 15th hole). He’s eight-under for the tournament and has a three-shot lead over Lee Westwood. Mickelson is still one-over for the tournament.
Adam Scott maintains his lead (9 a.m. update)
Adam Scott continues to play well, at one point moving to eight-under for the tournament before a bogey dropped him back to seven-under, putting him two shots ahead of Jim Furyk, who has yet to tee off in the second round, and Webb Simpson, who is an amazing seven-under so far on Friday.
Justin Rose birdied three holes in a row to get to one-under for the day and three-under for the tournament.
Simpson, the 2012 U.S. Open winner, was five-under through 12 holes Friday and moved to one-under for the tournament.
The crazy news of the day: Woody Austin had 15 clubs in his bag, more than allowed, and was assessed a four-stroke penalty.
Phil Mickelson had a tough time on the par-three third hole. His drive, hit with a four-iron, soared way right, off a cart path and over the gallery. Mickelson got relief because the bleachers were in the way, giving him a free drop and a better shot at the green.
Mickelson tipped his cap as he left his second shot about eight feet from the hole. He made his par putt and is even for the day, one-over for the tournament.
Adam Scott sets the early pace (8 a.m. update)
The second round of the 2013 PGA Championship is underway in Rochester, N.Y. Jim Furyk and Adam Scott were tied for the lead at five-under par after the first round and Scott, who teed off early on Friday, is two-under after six holes, moving him to seven-under for the tournament and into first place by himself.
The talk after the first round, however, was Furyk, who is trying to find some old magic in his golf bag. He hasn't won a major since the 2003 U.S. Open but continues his quest for this year's PGA title when he tees off at 9:50 a.m. PT Friday.
"No one is surprised to see Jim Furyk on top of any leaderboard," said Keegan Bradley, who was one-under after the first round.
Former world No. 1 Lee Westwood is two-under through nine holes Friday, moving him to six-under and into second place.
Tiger Woods, who had a disappointing first round of one-over 71, tees off at 10:45 a.m.
Phil Mickelson, who also had a first-round 71, is one-under through six holes Friday and at even par for the tournament.