Jim Furyk will take a three-shot lead into the final round of the US Open on Sunday after carding a tournament best for 54 holes, a 10-under-par 200.
The 33-year-old American posted a three-under-par 67, which included a birdie on the final hole,
to give himself a gilt-edged chance of landing his first Major title.
The previous US Open 54-hole record of 203 was set by Lee Janzen in 1993 at Baltusrol.
Joining Furyk in the final group on Sunday will be Stephen Leaney. The unheralded Australian
showed great resolve to overcome a mid-round wobble and record a third straight sub-par round of 68.
But defending champion Tiger Woods endured a miserable day, carding six bogeys and one birdie in an uncharacteristically sloppy round. The world number one is 11 shots off the lead at one over par.
Woods never looked happy from the moment a fan whistled on the backswing of his second shot on the first hole.
"I made nothing out there," a dejected Woods said.
"When you don't make any putts, you can't get momentum. And then I missed a couple of par putts to compound the problem."
Woods had hit a perfect drive at the 576-yard opening hole but then pushed his approach into the right front bunker as the whistle came from the galleries.
"It came on my downswing, and you can't stop that. I've no idea whether it was intentional," he said.
Furyk had shared the overnight lead with Vijay Singh, and at one stage it looked like the pair were turning the 103rd US Open into a two-horse race, but a bogey-bogey-bogey finish left the Fijian five shots behind Furyk on five under.
Singh is in a tie for third with Zimbabwe's Nick Price, who had earlier threatened to muscle in on Furyk's record attempt by firing five birdies in the first six holes.
The 46-year-old veteran, a three-time Major champion, lost his way in the middle of his round but finished with a birdie to recover to five under.
LEADERBOARD (US unless stated)
-10 J Furyk
-7 S Leaney (Aus)
-5 N Price (Zim), V Singh (Fij)
-4 D Pride, I Leggatt (Can), E Romero (Arg), J Byrd
"I got off to a great start and I just tried to hang in there," Price said.
"But on the back nine my driving let me down. It was tough out there today."
One shot behind Price and Singh on four under are a quartet comprising Americans Dicky Pride and Jonathan Byrd, Canada's Ian Leggatt and Argentine Eduardo Romero.
Two-time Major winner Mark O'Meara is a shot further back with 1989 Open champion Mark Calcavecchia and Billy Mayfair.
Chances of a European success - their first since Tony Jacklin in 1970 - are about as bright as Woods'.
Swede Fredrik Jacobson is best placed, but he is joint 15th at one under following a 73.
Darren Clarke and Justin Rose both stand one over alongside Woods, Padraig Harrington is three over, Colin Montgomerie one further back and Brian Davis, like Rose making his debut, seven over.