Rory McIlroy and Shane Lowry are set for a final-day duel at the AT&T Pebble Beach Pro-Am at Pebble Beach Golf Links in Pebble Beach, California.
McIlroy and his fellow Irishman Lowry shot matching 65s to sit one shot back from the lead of Sepp Straka.
The Austrian, who had a three-shot halfway lead in his bid to claim a second win of the PGA season, birdied four of his last five holes in a third-round 70 as he moved to 16-under-par.
Straka started strongly with a pair of birdies, but dropped a shot at the fourth and had three successive bogeys from the turn before his strong finish.
McIlroy, making his season debut on the PGA Tour, posted birdies on three of the final four holes.
"It was a really good poor-weather performance," he said. "One thing I'm trying to get better at is trying to play more bogey free-rounds.
"I think just playing a little smarter, playing the right shot at the right time, not hitting destructive shots. It feels a little more boring at times, but it's definitely more effective."
Lowry played the last eight holes in four-under due to four birdies. He played the first three holes in four-under, boosted by an eagle three on the second hole.
The Offaly native was quick to downplay the idea that weather back home had equipped him well for the wet and windy conditions.
"I live in Florida for a reason," he told the PGA website.
"It was like this in Ireland when I was home at Christmas and my golf clubs sat in my hall. I didn't play golf. When the weather is like that, I don’t play golf anymore.
"There’s a few courses in the world that you would like to win on and this is definitely one of them.
"So you try not to think about stuff like that and hopefully it comes to you someday."
It sets up with the potential for numerous golfers to rise to the top during the final round.
Justin Rose mixed an eagle and five birdies with three bogeys as he bids for a second win at Pebble Beach.
World number one Scottie Scheffler was six strokes off the pace on his delayed first outing of the season following injury.
