LOS ANGELES (AFP) — Three-time major winner Jordan Spieth fired seven birdies in his six-under par 64 on Thursday to share the US PGA Tour Sony Open lead with Chris Kirk and Taylor Montgomery when darkness halted play.

Spieth and Kirk — who also had seven birdies — set an early first-round target at Waialae Country Club in Honolulu, Hawaii, where Taylor seized his share of the lead with a birdie at the 18th shortly before play was halted.

Spieth said he was confident he could maintain the pace, something that hasn't always been the case in recent years as the 29-year-old's game hit the doldrums and he fought to make changes.

"Days like today I'm not surprised, but what I will say is I'm confident relative to other time periods I've been off to similar starts, which is a really good place to be," said Spieth, who ended a nearly four-year title drought in 2021 and added a title at the Heritage last year.

"I believe I can shoot five- or six-under each day out here," Spieth said. "Not to say that that means it'll happen, but there are other times I would be sitting there going, how do I hold this together, to be honest."

Spieth opened with a birdie at the 10th and added another at 12. He rebounded from a bogey at 13 with birdies at the 18th and first, then rolled in an eight-footer at the fourth and put himself inside two feet for a birdie at the fifth.

He picked up one more shot with a 27-foot putt at the par-three seventh.

"I feel like I left a couple out, but I also really had fun today," Spieth said. "It can be a really fun golf course once you start peeling it down these fairways."

Kirk, back in action after a break of almost two months, said he'd been working on his fitness during the downtime.

Kirk, who finished tied for second at Waialae two years ago as he mounted a comeback to the tour, is seeking a fifth US PGA Tour title and his first since 2015.

"I've had a lot of good finishes here," Kirk said. It's "just a place where I'm comfortable."

Montgomery, a Korn Ferry Tour graduate chasing his first PGA Tour title, had joined the leaders with a birdie at the 14th, then bogeyed the 15th before his two-putt birdie at the par-five 18th.