Sam Ryder admitted he is still coming down off the adrenaline after his exhilarating hole in one on the 16th hole at the Phoenix Open on Saturday.

Ryder, who had endured a difficult round which included four bogeys and a double bogey, landed the ace, ushering in wild scenes of celebration from the packed onlooking crowd.

Play had to be halted for 15 minutes as debris was cleared off the course after the crowd splashed drinks and threw beer cans in the air in a raucous celebration of a rare feat.

The 32-year-old American became the first player to hit a hole in one on the 16th at Scottsdale since Francesco Molinari in 2015. Ryder is also the 10th player to achieve the feat.

“Still kind of coming down off the adrenaline,” Ryder told reporters, “But, yeah, it was pretty crazy.

"It's got to be number one. Nothing compares to that... it was a blur. I can't describe it."

Ryder hit a 124-yard tee shot which spun left and into the cup for the ace, re-living it afterwards.

"[Chris Kirk] hit a really good shot in the middle of the green, so I kind of got a little bit of feel off of what it was playing," Ryder explained. "It was just one of those things I was talking to my caddie, and it just ended up being a perfect 54 degree wedge.

"The club - everything always plays a little shorter in there, adrenaline or whatever it is, it's just, it always plays shorter. I just told him, 'it's just got to be that, doesn't it?' And he's like, 'that's all I ever thought'.

"We just talked through it a little bit and I was looking just out to the right and wanted to come down around his ball and maybe it was an accidental one-yard pull or something. It didn't look like it was moving too fast on the camera when I saw it, but in the air it just looked perfect."

Despite the hole in one, Ryder is eight strokes off the pace, sitting at six-under-overall ahead of the final day on Sunday.

Sahith Theegala recovered from a tricky start on Friday to maintain a breakout run at the Phoenix Open, where he now leads by two after two rounds.

Theegala, playing on a sponsor's exemption, had taken a one-shot lead into the day's play – albeit only after a suspension on Thursday due to bad light.

Starting with a par putt at the 17th on seven under, Theegala missed the hole and then bogeyed the 18th, too, falling back to five under.

But the 24-year-old, who turned professional in 2020 but is still living with his parents, got back in the groove in round two.

Three consecutive birdies and a fourth at the par-four fifth put Theegala in a great position, turning in 32 after a bogey at the eighth.

It only got better from there with a bogey-free back nine that featured four birdies, including at each of the last two holes – ending his Friday in far more convincing fashion than he had started it.

Theegala's only top-10 finish on the PGA Tour to date was a tie for eighth at the Sanderson Farms Championship in October, but he heads into the weekend at Scottsdale leading a star-studded field.

"I haven't had time to let it set in," he said after signing for a seven-under 64 to move to 12 under.

"Hopefully I don't think too much about it, because obviously what I've been doing has been working the first couple days.

"I'm just thankful that I'm here and trying to make the most of the opportunity – no expectations at all, honestly."

Having already threatened to crumble once, the pressure is only set to ramp up from here. Theegala's closest challengers are Brooks Koepka (66) and Xander Schauffele (65) at 10 under. Patrick Cantlay (66) is a shot further back.

"I'm ready to embrace whatever is ahead of me this weekend," Theegala added.

Brooks Koepka made a strong start to the Phoenix Open as he heads into day two in a tie for third at five under par, with the four-time major winner looking to put an "embarrassing" fall from grace behind him.

Koepka has not won a tournament since succeeding in Phoenix a little under a year ago – while he impressed at the PGA Championship in May, finishing joint-second, Koepka is not happy with how the past 12 months or so have gone.

He teed off in Arizona ranked 20th in the world, something of a far cry from spending 47 weeks at number one across 2018 and 2019 – three of his four major wins came in those years.

Koepka, rarely one to mince his words, feels ashamed of his slide, even if he puts it partly down to injury.

"That's embarrassing to be 20th, I feel like," he said after his first round on Thursday.

"A lot of it has to do with injury, man. I've been hurt, on the sidelines. Not playing, playing through injury, you can't compete with guys out here.

"It's nice to be somewhat healthy and get out here, and I mean, I'm not too worried about it [the ranking], it will bounce back up."

Indeed, there was nothing embarrassing about his performance at TPC Scottsdale on day one, his six birdies – offset by a single bogey – putting him right near the top of the leaderboard.

Nevertheless, he still has a plenty of work to do.

Lee Kyoung-hoon is one shot better off thanks to a glorious showing after the turn, playing the front nine five under par after starting on the ninth hole.

But leading the way is a surprise contender: 24-year-old Sahith Theegala, who is competing as a sponsor's exemption.

Theegala has a one-shot lead over Lee, though he had to finish his round while putting on his 17th hole of the day as play was suspended due to bad light.

Additionally, his next shot when he resumes in the morning will be a 16-foot putt for par, so his lead may not last for long.

A host of familiar names are not too far behind those leading the way, with Xander Schauffele, Louis Oosthuizen, Patrick Cantlay, Jon Rahm and Bubba Watson among a large group on four under.

Jordan Spieth is three shots further back.

Luke List has had a long wait for his first PGA Tour win and that was extended after a two-hour wait before triumphing in a playoff over Will Zalatoris at the Farmers Insurance Open on Saturday.

The 37-year-old American, enjoyed an excellent final round six-under-66, highlighted by four consecutive birdies from the third to the sixth holes, to storm up the leaderboard at Torrey Pines.

But List, in his 206th career start, waited almost two hours after entering the clubhouse as the overnight leaders completed their rounds before facing Zalatoris, who also finished 15-under overall, in an 18th hole playoff.

In fading light, the pair both landed their tee shots within inches of each other in a bunker, with List's third shot placed close to the hole, enabling him to tap in to card a birdie.

Zalatoris pushed his longer birdie putt, which was near-identical to his 18th hole putt for victory that he missed, wide left again to settle the playoff in List's favour.

California-born 25-year-old Zalatoris may have clinched victory on the 18th as List patiently waited and practiced elsewhere, but was agonizingly short and slightly wide after a late fade on his putt.

He carded a final round one-under-71, grouped alongside Jason Day and Aaron Rai, with world number one Jon Rahm also making a late charge.

Day shot into a share of the lead after landing an eagle on the 14th hole but had to settle for joint third alongside Rahm and Cameron Tringale at 14-under-par overall.

The Australian, who had not won a PGA Tour title in 1,364 days, finished with back-to-back bogeys to slip from contention.

Rahm rolled in a clutch 26-foot putt to birdie the 17th to be one shot off the pace but only managed par on the last hole.

Joaquin Niemann, Justin Rose, Pat Perez, Sungjae Im and Rai were next, finishing 13-under overall.

Will Zalatoris goes into the final round of the Farmers Insurance Open with a first PGA Tour win in his sights after a superb performance on day three.

Zalatoris claimed a share of the 54-hole lead with Jason Day thanks to a seven-under-par 65 at Torrey Pines.

That took him to 14 under, level with 2015 US PGA Championship winner Day, who carded a 67.

Zalatoris had started the day six strokes adrift of midway leaders Jon Rahm, Justin Thomas and Adam Schenk.

But an eagle at the par-four second gave him early momentum and five further gains followed in a blemish-free round for last season's Rookie of the Year.

That eagle featured a 338-yard tee shot as a day Zalatoris described as perhaps the best with the driver "maybe ever" put him in position to push for a maiden tour win.

Asked how much distance he has gained following a switch to a 46-inch driver, Zalatoris replied: "Twelve yards, I've clocked it up to 127 [mph clubhead speed] and have 186 ball speed so, around here, that's huge.

"Obviously you've seen what Bryson [DeChambeau] has done, you won't be seeing me at 220 [ball speed] anytime soon but definitely the added distance has really paid dividends."

Along with Day, Zalatoris still has Rahm in his rear-view mirror, a level-par 72 keeping him at 13 under, tied for third with Aaron Rai.

Rahm carded a double bogey at the 10th and lost another shot at the 12th, but he will hope his experience of winning the U.S. Open at Torrey Pines last year can help him recover on Saturday.

Thomas, meanwhile, carded a one-over 73 and has Cameron Tringale and Sungjae Im for company on 12 under.

Adam Schenk carded a 10-under-par to surge into a share of the lead alongside top-ranked Jon Rahm and Justin Thomas at the halfway mark of the Farmers Insurance Open on Thursday.

Schenk, who is ranked 54th and has never won a PGA Tour title, carded a career-best PGA Tour round of 62, which included making 10 birdies and hitting four of 14 fairways.

The American, who turned 30 on Wednesday, made eight consecutive birdies was within one shot of equaling the course record, with his 15-feet putt on the 18th hole lipping out.

Reigning US Open winner Rahm, who opened the tournament with a six-under-par 66, backed up with a seven-under-round on the second day on the North Course at Torrey Pines.

World number six Thomas is locked with Schenk and Rahm at 13-under overall after his nine-under round.

The trio lead from Cameron Tringale at 12-under, with Peter Malnati next with 11-under.

Opening day leader Billy Horschel slipped down the leaderboard after a one-over round to be eight-under overall.

Will Zalatoris, who started and finished the second day with eagles, is among a group of six at seven-under including Dustin Johnson.

Phil Mickelson, Bryson DeChambeau, Jordan Spieth, Rickie Fowler, Tony Finau and Brooks Koepka were among the notable players to miss the cut.

Spieth's four-over card ended his run holding the longest active made-cut streak (20) on the PGA Tour.

Billy Horschel leads the way after the opening day of the Farmers Insurance Open in San Diego with world number one Jon Rahm the best of the big names in the field.

Horschel leads by one stroke from Michael Thompson after the 35-year-old American carded a bogey-free nine-under-par 63 on the North Course at Torrey Pines.

World number 23 Thompson also went bogey free on Thursday, birdieing four of his first five holes to jump out of the blocks, before birdies on the 17th and 18th holes rounded out a strong day.

Stephan Jaeger and Kevin Tway are seven-under-par, with Rahm on six-under-par alongside three others players; Rickie Fowler, Doug Ghim and Francesco Molinari.

Rahm's round on the South Course included two bogeys and six birdies but he jumped up the leaderboard with an eagle on the 18th.

Sam Burns, Daniel Berger and Tony Finau are among a group of players tied at five-under while Justin Thomas started with a four-under-par 64 but had five birdies on his front nine before two bogeys in his final five holes.

Tokyo Olympics gold medallist Xander Schauffele and 2020 Masters champion Dustin Johnson are also four under.

A bleach-blonde Brooks Koepka had two bogeys and four birdies to be two under, alongside three-time major winner Jordan Spieth and 2020 US Open champion Bryson DeChambeau.

Hudson Swafford carded an eight-under 64 to charge to his third career PGA triumph winning the American Express by two shots from Tom Hoge at La Quinta on Sunday.

The 34-year-old American enjoyed a remarkable final day after bogeying the first hole, with nine birdies and an eagle on the 16th to finish victorious at 23-under.

Entering the 16th hole, Swafford was level with Francesco Molinari and Brian Harman at 20-under but a clutch second shot set up eagle, before a birdie on the 17th and making par on the 18th to close out the win.

Swafford's previous two PGA titles came in 2020 and 2017, the latter being at the same event. He had five birdies and an eagle on his back nine along with two bogeys, edging out Hoge who carded a four-under 68 on the final day to finish 21-under.

Harman, Lanto Griffin and overnight joint leader Lee Hodges were equal at 20-under, with the latter struggling with a two-under-par 70 on Sunday.

Fellow day three joint leader Paul Barjon slipped down the leaderboard with a one-over-par 73 to finish 17-under.

Reigning PGA Tour Player of the Year Patrick Cantlay was unable to make a final day move, carding a four-under 68 to end up 18-under, behind Will Zalatoris, Denny McCarthy and Molinari (all 19-under).

First day joint leader Lee Hodges returned to the summit alongside Paul Barjon after carding an eight-under 64 while world number four Patrick Cantlay slipped down the leaderboard on the third day at the American Express.

Event debutant Hodges responded after his second day 72 with a fine round that included six birdies on the front nine on the stadium course at La Quinta in California on Saturday.

Hodges is 18-under overall, sharing the lead with France's Barjon who carded a seven-under 65 on the stadium course to also soar up the leaderboard.

Cantlay, who had shared the lead with Hodges after the first day and was the outright leader after the second, carded four bogeys in his even-round 72 which saw him slide to 14-under overall.

Tom Hoge remains poised one shot off the leaders at 17-under overall, with five birdies and one bogey in his round of 68.

Ireland's Seamus Power is one stroke behind Hoge, with Harry Higgs, Hudson Swafford, Lanto Griffin, Cameron Young, Harold Varner III and Francesco Molinari all next best 15 under.

World number one Jon Rahm is not far behind, having carded a five-under 67 to be 13-under overall, while veteran Phil Mickelson missed the cut.