Internationals Retief Goosen and Ryo Ishikawa top the standings after the opening round at the Quicken Loans National.
South African veteran Retief Goosen turned back the clock as he produced a faultless first round for a share of the Quicken Loans National lead in Virginia on Thursday.
Goosen - U.S. Open champion in 2001 and 2004 - carded an eight-under-par 63 on a rain-soaked course at the Robert Trent Jones Golf Club.
The 46-year-old tallied eight birdies without dropping a shot, four of those coming in a six-hole stretch on the back nine, as he ended the day alongside Japan's Ryo Ishikawa.
Bidding to win his maiden PGA Tour title, Ishikawa posted a memorable season-low round.
Ishikawa teed off on the back nine and reeled off five successive birdies from 14 through 18, though the highlight of round came after the turn when the 23-year-old hit a hole-in-one at the fourth.
Joining Goosen in recovering old form was Tiger Woods, who recovered from being three over through four holes to card six birdies thereafter - including four straight on the back nine - to finish with a 68.
Justin Leonard, Kevin Chappell and Ernie Els are all a shot off the pace, while Steve Wheatcroft, Jeff Overton, Mark Hubbard and Andy Sullivan began their respective weeks with six-under 65s.
Defending champion Justin Rose is a stroke further back alongside seven other competitors, including Jonas Blixt and Justin Thomas.
Rose, who won his second Quicken Loans National crown via a play-off at the Congressional Country Club last year, registered eight birdies and three bogeys during his first-round 66.
World number eight Rickie Fowler - tied for 18th - shot a hole-in-one from his final hole of the day as he carded a 67.