Patrick Reed will take a seven-shot lead into the final day of the Humana Challenge after his third successive nine-under-par round in California this week.
Back-to-back 63s at the PGA West resort's Palmer course and La Quinta put Reed in control at the tournament formerly known as the Bob Hope Classic.
He was equally prolific on day three at the PGA West resort's Nicklaus course as he moved onto 27-under-par overall.
The Texan is seven shots clear of Brendon Todd and Charley Hoffman, but is taking nothing for granted despite being in a formidable position to land his second PGA Tour title.
"It kind of seemed like deja vu all over again," Reed told the PGA Tour website.
"When I played today, I felt just as confident as I did the last two days and the putter is still working."
"I'm just going to treat tomorrow as if it's a Monday qualifier, 18-hole shootout, everybody's tied at even par and hopefully I can go out and do the same thing I've done in the past three days."
Starting on the back nine, Reed had three birdies over his first five holes and then eagled the par-five 16th to surge well clear.
The 23-year-old picked up further shots at the first and fourth before making his only bogey of the day at the fifth.
However, he followed that up with two birdies and finished in superb style, hitting his 131-yard approach shot to four feet before sinking the putt for another birdie.
Reed claimed his maiden PGA Tour win at the Wyndham Championship in August last year and victory on Sunday would make him only the third player currently under the age of 25 - alongside Rory McIlroy and Harris English - to hold multiple Tour wins.
Todd and 2007 champion Hoffman are tied for a distant second on 20-under-par overall.
Todd was Reed's closest challenger overnight but slipped off the pace after a four-under-par round at La Quinta, while Hoffman carded 66 at the Palmer course.
James Driscoll is on 19-under-par overall, while fellow Americans Bill Haas and Justin Leonard are a further shot back.
Australian Matt Jones is the only non-American in the top 10, currently on 17-under-par alongside four players.