Australian Cameron Smith fired a career-low and course record 11-under par 60 to seize a share of the lead with Spain's Jon Rahm after Saturday's third round of the US PGA Tour Northern Trust tournament.

The 28-year-old from Brisbane shot a bogey-free 30 on both the front and back nines to equal top-ranked Rahm on 16-under par 197 after 54 holes at rain-softened Liberty National in suburban New York at the first FedEx Cup playoff event.

"The course is playing pretty soft," Smith said. "I expect the boys will get up there. We're all going to try our best."

Rahm, the reigning US Open champion who missed the Tokyo Olympics due to Covid-19, grinded out level par on the back nine to shoot 67.

"I surely hope I don't need to rely on something so unfortunate every time to have a big win," Rahm said. "I've been able to look at the positive side of things and come back even stronger.

"I came in here ready to go."

Australian Cameron Smith fired an 11-under par 60 on Saturday to set a course record at Liberty National in the third round of the US PGA Northern Trust tournament
Australian Cameron Smith fired an 11-under par 60 on Saturday to set a course record at Liberty National in the third round of the US PGA Northern Trust tournament GETTY IMAGES NORTH AMERICA / Stacy Revere

South African Erik van Rooyen fired a 62 to stand third on 198 with Americans Justin Thomas and Tony Finau on 199 and Ireland's Shane Lowry, Norway's Viktor Hovland and American Tom Hoge on 200.

PGA officials postponed the final round from Sunday to Monday because of oncoming Hurricane Henri, which raised weather warnings across the region.

"It's hard to back up a really good round, so maybe the day off will help me out," Smith said.

Smith's prior career low, like the old course record, had been 62. Four of the six players who shot 62 at Liberty National before Smith's 60 did so this week, including Lowry and Canadian Corey Conners on Saturday.

A day after leaving Liberty National in frustration from a second-round 68, Smith made a career-high 11 birdies in the round.

"I guess that's just golf. It's such a weird game," he said. "I left frustrated. I felt like I hit my driver everywhere and scrambled real well.

Top-ranked Jon Rahm of Spain watches his shot from the rough at the par-5 13th hole in Saturday's third round of the US PGA Northern Trust tournament
Top-ranked Jon Rahm of Spain watches his shot from the rough at the par-5 13th hole in Saturday's third round of the US PGA Northern Trust tournament GETTY IMAGES NORTH AMERICA / Sarah Stier

"I got here this morning and body felt a little bit different and ball striking was a whole lot better."

Smith birdied five of the first six holes -- his longest putt from 16 feet at the par-3 second -- and he holed out from 31 feet at the par-4 ninth, then rolled in a nine-foot birdie putt at the 10th.

"It has been a bit of a rough trot with the driver of late. It has gotten away from me a little bit," Smith said. "It was nice to see a lot of drives, a lot of good drives, today."

The world number 28 who shared second at last year's Masters tapped in for birdies at the par-5 13th, par-3 14th and 16th and sank a four-foot birdie putt at the 17th. He missed a birdie putt from just inside 12 feet at 18 for a 59.

"It was just a mis-read," he said. "I can't be too disappointed."

Smith's only solo PGA title came at the 2020 Sony Open in Hawaii, although he twice won the Zurich Classic pairs event in New Orleans, most recently in April with compatriot Marc Leishman.

Rahm went a PGA career-best 48 holes this week before making his first bogey.

The 26-year-old Spaniard made 13-foot birdie putts at the par-3 fourth and par-5 sixth, a 17-footer to birdie seven and another from just inside four feet at the par-5 eighth.

Rahm rolled in a 14-foot birdie putt at the par-3 11th to seize the lead alone at 17-under, but he found water on his second shot at the par-5 13th and plopped his fourth into deep grass on the way to a double bogey.

Rahm answered with a three-foot birdie putt at 15 but found water again over the green at 16 and made bogey, only to answer with another three-foot birdie putt at 17.

"It's about trying to be consistent and give yourself as many chances as possible," Rahm said.