Overnight leader Jason Dufner teed off in Saturday's third round of the PGA Championship facing a formidable Oak Hill layout that frustrated Tiger Woods and Phil Mickelson.
Dufner matched the all-time low major round of 63 on Friday to set a course record and stand on nine-under par 131 after 36 holes but he humbled a rain-soaked course that was dry Saturday and showing its teeth in perfect conditions.
World number one Woods fired a three-over par 73, dooming his bid for a 15th major title at four-over 214 for 54 holes. He made bogeys at the first and par-3 third after finding the rough off the tee, birdied the par-3 11th but bogeys at 16 and 17 dropped him back.
Second-ranked Mickelson, who won the British Open three weeks ago, struggled to a 78 -- matching his worst-ever PGA Championship round -- and was 74th on 10-over 220, making bogeys on three of the last four holes as well as a double bogey and triple bogey.
Dense rough and tricky greens awaited Dufner, who left a 12-foot putt short at the 18th green for a 62 in the second round. Dufner, who shared fourth at the past two US Opens, also squandered a four-shot lead with four holes to play in losing the 2011 PGA Championship at Atlanta.
"Guys that are able to close these majors off can adjust to the conditions," Dufner said. "If the greens speed up I'll have to adjust just like everybody in the field.
"It will be another tough day, a good test."
Reigning Masters champion Adam Scott of Australia and Americans Jim Furyk, the 2003 US Open winner, and Matt Kuchar began the round two off Dufner's pace with England's Justin Rose, the reigning US Open champion, and Sweden's Henrik Stenson were another shot adrift.
Even after taking advantage of the water-drenched course in round two, Rose expected tougher conditions for the weekend.
"The greens will get firm and fast, especially by Sunday," Rose said. "Oak Hill will always need to be respected."
Scott, however, was counting on the rain-soaked course to remain vulnerable.
"I think it's not going to dry out at all to where it will get really tough," Scott said. "The greens are going to be fairly moist for the whole weekend, and even the fairways probably, so it's going to be right there for the taking at the weekend, although it's still going to penalize bad shots."
One who solved Oak Hill on Saturday was American Dustin Johnson, who fired a 65.