Bad weather halts Jason Day's US PGA rise

World No.7 Jason Day's charge up the PGA Championship leaderboard has been stopped in its tracks by bad weather midway through the second round.

Day, the 2015 PGA Championship winner and runner-up last year, had dropped a shot on day two but a stunning tap-in eagle at the par-5 seventh hole at Quail Hollow preceded three consecutive birdies as he raced to a five-under-par total.

Just as the Queenslander climbed finished his 10th hole and climbed to outright third, three shots back of clubhouse leader Kevin Kisner, play was suspended due to bad weather at 4.43pm local time.

Day's playing partners, world No.1 Dustin Johnson and 2016 British Open champion Henrik Stenson, sit at one-over and three-over respectively.

Earlier on Friday, American Kisner set the pace with a second consecutive 67 rocketing him to eight-under for the tournament.

World No.3 Hideki Matsuyama, fresh off his win at last week's WGC-Bridgestone, managed 14 holes before play was suspended and is outright second at six-under.

South Africa's Louis Oosthuizen (10 holes) and American Chris Stroud (six holes) are a shot back of Day sharing fourth.

Earlier, Adam Scott plummeted down the leaderboard.

After starting Friday well in the mix at even par, Australian world No.17 Scott slumped to a 76 to leave himself a whopping 13 shots off the pace.

Starting on the 10th hole, Scott's horror round began with a double-bogey at the 11th and the 37-year-old dropped another two shots before making the turn.

After three more bogeys on his back nine, Scott rallied with two late birdies to salvage a 76.

Fellow Australian Scott Hend sits at three-over the card through seven holes, while Marc Leishman bounced back from his opening-round 75 with an even 71 to sit at four-over.

Cameron Smith (eight holes) has dropped four shots to sink to eight-over while fellow Queenslander Rod Pampling (nine holes) is struggling at 10-over.

Brisbane teaching pro Stuart Deane has blown out to 20-over, seven-over on his round through 15 holes.