Henrik Stenson two-putted from 42 feet for birdie to match American Rickie Fowler for the lead at 13-under par in Sunday's final round of the PGA Championship.
Sweden's fourth-ranked Stenson, seeking his first major title, made four birdies in his first seven holes to claim his share of the top spot.
Rickie Fowler's 20-foot chip-in at the fifth capped a run of three birdies and put him on 13-under as well.
Five-time major winner Phil Mickelson was on 12-under with four-time major winner Ernie Els on 11-under with Finland's Mikko Ilonen, Austrian Bernd Wiesberger and Rory McIlroy, who missed a six-foot par putt to bogey the sixth, his second bogey of the day.
Fowler, a runner-up at the British and US Opens, stood on 13-under par after seven holes at rain-soaked Valhalla, where drenched greens offered plentiful birdie chances to golf's top stars.
Fowler, who also shared fifth at the Masters, could collect his first major title at age 25 and become the first player since Tiger Woods in 2005 to finish in the top-five in all four majors in the same year.
Only Woods and Jack Nicklaus have achieved the feat, each doing so twice and in every case always winning at least once.