Third round leaderboard:
-19 M Laird (Sco) -18 J Byrd (US) -17 C Percy (Aus), W Simpson (US) -15 C Beckman (US), S Levin (US)
Selected others: -13 R Fowler (US) -12 D Duval (US)
Laird holes a key putt for par during his third round
Defending champion Martin Laird carded a fine 63 to take a one-shot lead into the final day of the Justin Timberlake PGA Tour event in Las Vegas.
The Scot reached 19 under after carding six birdies and an eagle on the 341-yard 15th with a drive to six feet.
Overnight leader Jonathan Byrd started and finished his round of 66 with birdies and lies second on 18 under.
Cameron Percy had the lowest round of the day, a career best nine-under 62, and shares third a further shot behind.
Laird, who took up a golf scholarship at Colorado University and graduated with a degree in marketing in 2004, won the tournament last year in a three-man play-off with George McNeill and Chad Campbell.
It was the 27-year-old's first PGA title and earned him a two-year Tour card.
This year he has played in 25 events on the PGA Tour, making 17 cuts and recording three top-10 finishes.
In this tournament he had two bogeys in a patchy opening round of 69 at the par-71 TPC Summerlin course but has since gone 40 holes without dropping a shot.
"It's been a good three days and even after only shooting two under the first day, I was pretty confident that I could post three low ones in a row to get back in contention.
"I maybe didn't think I'd post 17-under the next two rounds, but I'm pleased obviously where I am and I'm looking forward to the final round," he said.
"Any time you shoot 62 you've got to feel pretty good after it. I was just pleased to finally make some putts, because as I said, I hit it just as good on Thursday as I did on Friday, just made nothing, so it was nice to see the ball go in the hole.
"I've started to get a little more comfortable with the speed of the greens as the week has gone on and putted nicely again today, so hopefully I can keep that up."
It was not a good day for Japan's Ryuji Imada, however, who started one stroke off the lead, but followed his 62 of Friday with three bogeys in a disappointing 70 and is now tied for 11th, six off the lead.