Australia's Marc Leishman is two shots behind leader Patrick Reed in a tie for second going into the final round of the US PGA National.
American Reed had an even-par round on Saturday to be six-under-par for the tournament at Congressional Country Club.
Leishman, who shot a two-over round, is joined in second by South Korean Noh Seung-Yul and Sweden's Freddie Jacobson on four-under.
England's Justin Rose and Zimbabwe's Brendon de Jonge and Americans Ben Martin, Richard Lee, Hudson Swafford and Shawn Stefani have a share of fifth at three-under.
West Australian Oliver Goss, who only turned professional last week, dropped from overnight joint leader to tied 15th at one-under-par after a five-over 76.
Leishman, 30, made bogeys at the par-3 second and 10th, made a 12-foot birdie at the 14th but took a bogey at 17.
"It feels a bit like a US Open," said Leishman of a course that hosted the major event in 2011 and 1997.
"Happy to be in the position I am. Putted very ordinary. Hopefully I'll roll them all in tomorrow."
Reed converted his three prior 54-hole leads into PGA titles, winning last August at Greensboro, the Humana Challenge last January and at Doral three months ago.
"I'm in a great position," Reed said.
"Anytime you are in the lead going into Sunday you feel pretty well."
Since dubbing himself a world top-five player, 29th-ranked Reed has missed five cuts in eight events with a best finish of 35th at the US Open, but he has also become a father, his wife and caddy Justine giving birth to a daughter.
"After we played Doral, I was more focused on making sure Justine was all right and making sure the baby was fine," he said.
"Family comes first, so I was more focusing on that."
As for criticism over his top-five remark, Reed said, "I'm fine. Doesn't bother me."
Jacobson, 39, won his first pro title at the 2002 Hong Kong Open but his only title in 11 US PGA seasons came at the 2011 Travelers Championship.
He sizzled on the front nine, sinking three birdie putts from beyond 25 feet, but fizzled on the back side, a watery bogey at 10 followed by a double bogey at 11 and bogey at 13.
"I played awesome on the front nine, put myself in position," Jacobson said.
"I was indecisive on 10, just quit on the swing and it was wet. That tested me all the rest of the back nine."
Rose, trying to win for the first time since his dramatic US Open triumph in June of last year, was three-under after seven holes but settled for an even-par 71.