Tiger Woods was struggling to get going on moving day at the U.S. Open as he made the turn at one over for the day and tournament.

Woods, who claimed his 15th major at this year's Masters, posted two birdies and three bogeys in his first nine holes at Pebble Beach on Saturday.

The 43-year-old dropped shots on two of his first three holes but bounced back with successive birdies, sinking an impressive 24-foot putt to post his second gain on the par-three fifth.

However, Woods made a bogey at the seventh and then missed a makeable putt at the eighth to move back over par.

Danny Willett moved to within five shots of leader Gary Woodland by birdieing four of his first seven holes, but he slipped back to two under for the day and tournament with a dropped shot either side of the turn.

There was a dangerous scene near the 16th hole at Pebble Beach during the second round of the U.S. Open after four spectators were injured by a runaway golf cart.

A report from the California Highway Patrol said a vendor parked a golf cart to deliver boxes near a concession stand and when they got out, a box fell onto the accelerator and the cart started to move.

The report said those injured ranged in age from 25 to 82 and that two people were taken to hospital.

Tournament organisers the USGA released a statement acknowledging the incident.

"Unfortunately, during today's second round of the U.S. Open there was an incident involving a golf cart on the 16th hole that resulted in three spectators and a vendor being injured and requiring medical treatment," the USGA said in a tweet. 

"We will continue to monitor their conditions."

Rory McIlroy heads into the weekend at the U.S. Open full of confidence after overcoming a back-nine wobble during his second round at Pebble Beach.

After an opening 68 in what he described as benign conditions, the four-time major champion moved to within a shot of the lead at one stage on Friday following a birdie at the 11th hole.

However, McIlroy bogeyed the 13th after finding a bunker with his approach to the green and worse was to come at the next hole, starting with a poorly judged wedge shot that spun back off the green.

A fluffed chip then found sand, eventually leading to a double-bogey seven, but back-to-back birdies at the next two holes saw him recover to sign for a 69.

His five-under total at the halfway stage of the year's third major leaves him four shots behind Gary Woodland, though McIlroy is delighted with his form following the victory at the Canadian Open last week.

Asked in his press conference if this was as good as he had felt going into the weekend at a major in some time, he replied: "Yeah, I would think so.

"Carnoustie (at The Open) last year I was right up there. I played really solid golf and had a chance on Sunday.

"But coming off the back of a win last week and having another win this year, as well, and just the consistency that I've shown, it's the best I've felt about my game in a while for sure."

The 30-year-old admitted his desire to reach the top of the leaderboard proved costly, particularly as an aggressive approach at 13 and 14 was not in keeping with the plan to play it safe.

"It was very important to do all that hard work over the first 12 holes, and then to lose it in two holes - at 13 and 14 - was disappointing," McIlroy said.

"At 13, I wasn't disciplined enough with my second shot. I was trying to hit something into that back right corner of the green when I've really been preaching middle of the greens all week.

"I was feeling good about myself, six under par, and felt like I could squeeze a couple more out of the round, the last couple of holes, and maybe get the lead going into the weekend. I bogeyed that (13), which is fine, you're going to make some bogeys around here.

"But it was just the wedge shot on 14. I hit a club that I knew could pitch pin-high, but probably not very much further than pin-high, and then anything right of that pin, pitching there is going to come off the green.

"I probably missed by four or five yards right of where I needed to. And it came back down the hill, and then you're in an awkward spot, you're trying to play a very precise shot to get it close to the hole to save your par, and that didn't go to plan.

"It just sort of compounded the error with another error, which you never really want to do."

Gary Woodland is using his past experiences to help spark a breakthrough major victory after claiming the U.S. Open lead.

American Woodland surged to the top of the leaderboard thanks to a bogey-free six-under-par 65 at Pebble Beach on Friday.

The three-time PGA Tour champion, who joined Justin Rose and Tiger Woods as the only players to shoot 65 in a U.S. Open round at Pebble Beach, holed a monster 50-foot birdie putt for a two-stroke advantage.

Woodland never recorded a top-10 finish in any of his first 27 majors, however, he has managed two top-10s in his last four appearances.

The 35-year-old tied for sixth at the 2018 US PGA Championship at Bellerive Country Club and he was eighth following the same tournament this year.

Woodland was in contention with Brooks Koepka and Woods at the US PGA 12 months ago before Koepka sealed the title and the former is relying on that 2018 experience to help see him through in California.

"Being in that position, you learn you have to stay within yourself," Woodland told reporters. "You can't get caught up in what's going on around you. Obviously there's a lot more noise going on. Playing with Tiger on Sunday, I'd never seen anything like that. I'd never been in that atmosphere. I played in a basketball arena with 16,300 people right on top of you when I played against KU. There was nothing like that.

"…But you get used to it. You stay within yourself. You slow down little bit. Playing with Tiger, it's not the people, really, it's everybody inside the ropes. It's everybody moving around, there's so much excitement.

"But you learn to slowly slow your breathing. Adrenaline is a huge deal. All of a sudden you start hitting the golf ball a little bit farther. You learn to stay within yourself and what you have to do to calm yourself down and stay within your game plan."

Woodland, who is nine under heading into the weekend, added: "I've been in the situation recently, which has been a huge help. I was leading after 36 holes, played with Koepka there on Saturday. Playing with Tiger on Sunday at Bellerive was a huge daily shot, whatever he shot, 64, or whatever he did. Being in that atmosphere.

"I kind of got away a little bit early but held in and ended up shooting under par I believe there, which was nice. The comfort is within myself. I know what I'm capable of doing."

"From all those experiences you learn," he continued. "I've been in this position before. Last year in August at Bellerive and didn't come out where I wanted to but I learned a lot from that.

"I don't have to be perfect with my ball striking, because I have other things that can pick me up, that's been a big confidence boost for me, knowing I don't have to be perfect I can still contend and have a chance to win."

Gary Woodland earned a two-stroke lead after surging to the top of the U.S. Open summit at the halfway stage.

Woodland holed a monster 50-foot birdie on the final hole as the American signed off for a six-under-par 65 at Pebble Beach on Friday.

He went bogey-free while posting six birdies in total on day two to join Justin Rose (Thursday) and Tiger Woods (2000) as the only players to shoot 65 in a U.S. Open round at Pebble Beach.

Woodland's lone true scare of the second round came at the eighth hole (his 17th), where he put himself in bad position with his second shot off the right front of the green.

But Woodland got on with his third and made an extremely slippery putt down the hill to avoid dropping a shot and improve to nine under through 36 holes, ahead of Rose.

Rose – the 2013 champion – posted a second-round 70 to stay atop the leaderboard before Woodland's surge in California.

The Englishman's putting carried him to his superb first round, but his putter saved him from posting big numbers on Friday as Rose got up and down from several tough spots on the day.

South Africa's Louis Oosthuizen (70) ended the round three shots adrift of Woodland, with four-time major champion Rory McIlroy a stroke further back at five under.

McIlroy was on his way to a fantastic day as he was three under through 11, but a bogey and double bogey on back-to-back holes forced him to salvage what could have been a much better round.

The former world number one got it done though as he birdied two of the final four to finish with a two-under 69 to be level alongside Aaron Wise (71).

Two-time reigning champion and world number one Brooks Koepka carded back-to-back 69s to be a shot further back, tied with Chez Reavie (70), Chesson Hadley (70), Matt Kuchar (69) and Matt Wallace (68).

Dustin Johnson (69) is two under heading into the third round, while Jordan Spieth (69) climbed the leaderboard courtesy of a 69 to be eight strokes behind Woodland.

Masters champion Tiger Woods has ground to make up after back-to-back bogeys to end the day left the 15-time major winner seven shots off the pace.

Woods – seeking a fourth U.S. Open crown – dropped consecutive shots at the end of the day for a one-over-par 72.

Justin Rose admitted two-time reigning champion Brooks Koepka's name is looming large at the halfway stage of the U.S. Open.

Englishman Rose posted a second-round 70 to maintain his position atop the leaderboard in California on Friday.

Koepka (69) – seeking a third successive U.S. Open crown – ended the round three shots adrift of Rose, who is wary of the world number one at Pebble Beach.

"He seems to get very focused. He seems to let the mistakes roll off his back," Rose told reporters. "I've heard him saying that so I'm just regurgitating that.

"I imagine it's a good start for him. He looked rusty in Canada, and come here, it's a great first couple of days. He's probably feeling like he can build into the week and put a good weekend together.

"And no doubt, him on the leaderboard, with his recent form in majors, absolutely. He's a threat. He is the guy probably that his name is standing out more than anybody else's, for sure."

After opening the tournament with a 65, 2013 champion Rose went one under on day two to be seven under through 36 holes.

Rose birdied two holes on the back nine before the turn, which yielded a birdie in between a pair of bogeys.

"Often the golf course gets tougher for the leaders in the afternoon so I've always felt like there's an opportunity and a mindset that just hanging around," Rose said. "Obviously wait for your run. And it's going to be the same for me in contention.

"Even if I'm in the lead it's going to be about being very patient but still waiting for my run, still trying to hit positive golf shots, still looking for the momentum. And just working really hard and fighting really hard if you're out of position. Each save can mean a lot come Sunday."

Tiger Woods was infuriated by his finish in the second round of the U.S. Open, the former world number one venting his frustration after closing the day with back-to-back bogeys.

Woods carded a one-over-par 72 to move to even par at Pebble Beach, where the 15-time major champion was seven strokes off the pace.

The Masters champion made just one birdie throughout another tough day, which was made worse by consecutive bogeys at the eighth and ninth holes.

Asked if he was steaming after dropping back-to-back holes on Friday, Woods told reporters: "Yeah, I am. Not a very good finish."

Woods added: "I'm a little hot right now. I just signed my card about a minute ago. So need a little time to cool down a little bit.

"[The greens were a] little bit quicker. Still a little slow and bumpy. It's so important to be below the hole, because above the holes, they're a little tough to make.

"I had a couple opportunities there. I missed a couple. But overall I kept leaving myself above the hole. And unlike yesterday, when I missed it I missed the correct spots below the hole, today I never had that many looks from below the hole. And the one I did have, I made at 11."

While his round did not go according to plan, Woods remains in the hunt at the halfway stage of the U.S. Open – a tournament he has won three times but not since 2008.

"Right now I'm still in the ball game," the 43-year-old American star said. "There's so many guys with a chance to win. We've got a long way to go, and, you know, we'll see how it shapes up for tomorrow.

"The golf course can be a little bit faster, a little bit more springy than it was today, and scores will continue to back up a little bit."

Brooks Koepka fancies his chances of winning a third consecutive U.S. Open title after moving within three shots of leader Justin Rose at the halfway mark.

Koepka matched his first round of 69 at Pebble Beach on Friday to head into the weekend in a promising position on four under.

Rose led by two shots on seven under when he signed for a one-under 70.

World number one Koepka was pleased to keep himself in the mix for a fifth major title after getting through his round with only one bogey, becoming the first defending champion to break 70 in his first two rounds of the U.S. Open since Scott Simpson 31 years ago.

"I feel great. I'm excited. I've got a chance. That's all you can ask for. I just need to make a few putts. Sometimes the hole just needs to open up," said the American.

"If I can get off to a good start tomorrow, have that feeling where the hole's opening up, it could be a fun round. And I'll be honest with you, I struck it so poorly Monday and Wednesday.

"I wasn't playing good. And then it's been nice to kind of find some confidence, especially on the golf course."

Aaron Wise carded a 71 to share second place with Scott Piercy, Rickie Fowler, Xander Schauffele and Louis Oosthuizen - who were among the afternoon starters.

Tiger Woods will start moving day at level par following a one-over 72, while a 69 elevated Jordan Spieth to one under for the tournament. 

Justin Rose held a two-shot lead and Tiger Woods was grinding it out in the second round of the U.S. Open on Friday.

Rose was aggressive with the putter at Pebble Beach, opening up a three-shot lead on two occasions, only to bogey the first and fourth holes to drop back to seven under through 13.

The 2013 champion hit the turn in 34 after starting on the back nine, making gains at 15 and 18.

Rose, who led by just a solitary stroke after the opening round, dropped back to seven under when a par putt circled the cup but failed to drop at the first before hitting straight back at the second with another gain to restore his three-shot advantage.

The Englishman's lead was reduced to two again when he was unable to sink another par putt at four.

Francesco Molinari and Henrik Stenson were well poised on five and four under respectively, while Woods was fighting out - as he vowed to - on two under 14 holes into his second round, the Masters champion making just the one birdie at 11.

Two-time defending champion Brooks Koepka was also within striking distance on four under through 16.

Rickie Fowler, Xander Schauffele and Louis Oosthuizen - level on five under with Molinari and Aaron Wise (71) - tee off later in the day.

Tiger Woods and overnight leader Justin Rose were the centre of attention early on day two of the U.S. Open, but the third member of their group, Jordan Spieth, enjoyed the best start.

Woods, who clawed his way to a one-under 70 in round one, picked up a shot on his second hole, the 11th, to reach two under for the tournament and sit four behind playing partner Rose.

Yet the 15-time major champion was soon joined on that score by Spieth, after the 2015 U.S. Open winner birdied the 10th, 11th and 13th.

Two-time defending champion Brooks Koepka was alongside Woods and Spieth at two under, having played six holes on Friday.

After equalling the lowest first-round score in a U.S. Open at Pebble Beach with an opening-day 65, matching the mark set by Woods in 2000, Rose began his second 18 with four pars to retain the lead.

The Englishman was briefly joined at six under by Aaron Wise, who offset a bogey at the second with back-to-back gains on the fifth and sixth, only to then double-bogey the par-three seventh.

Meanwhile, Chesson Hadley, starting on the back nine, birdied the 10th and 12th to get to five under.

According to Friday's forecast, breezes were again expected to be relatively tame, taking away one of Pebble Beach's main defences and making it a second consecutive day ripe for scoring.

Thirty-nine players were under par after the opening round, the second-most in U.S. Open history, after the 44 who broke par at Erin Hills in 2017.

The likes of Rickie Fowler, Xander Schauffele, Louis Oosthuizen (all five under after round one) and Rory McIlroy (three under) were among the day's later starters.

Two-time defending U.S. Open champion Brooks Koepka said he has "a lot of confidence" after making a solid start at Pebble Beach.

Koepka – seeking a third successive U.S. Open crown – carded a two-under-par 69 to be four shots behind leader Justin Rose on Thursday.

Not since Willie Anderson in the early 1900s has a player won the major tournament three years in a row, but Koepka – who is coming off back-to-back US PGA Championship titles – is oozing confidence.

When asked if he was even calmer with every passing major, world number one Koepka told reporters: "You definitely get more comfortable.

"And I have a lot of confidence, there's no doubt of that. It's becoming easier and easier as I keep playing them."

American star Koepka made a hot start in his bid for a three-peat, birdieing four of his opening six holes in the first round.

Koepka dropped a shot at the eighth hole but bounced back by birdieing the 12th, though he bogeyed the 13th and 17th to close out the day.

"It's a battle if you're not going to hit fairways. If you're not going to hit greens, it's going to be tough," the 29-year-old said. "I'm actually quite pleased.

"I don't know how many fairways I hit from eight on in. I didn't hit many. And didn't hit many greens. The up-and-down I made on 16, had a good chance on 15, but sometimes those greens are so slopey, and you've got a four-footer and you're playing it with what feels like two feet of break. It's going to happen."

Koepka added: "You know what you're going to get at Pebble. I think it's going to be a lot of rough around the greens, around the fairway. So if you miss it you can be in trouble. The putting surfaces are as good as I've seen them.

"Probably the best poa I've putted on. And they might firm up as the week goes on, I'm assuming they will. And even if they do it's not like they're overly firm right now, especially with the fog and mist coming in in the morning. I think it's going to be just fine."

Tiger Woods said he was "very pleased" to start his U.S. Open campaign under par at a tricky Pebble Beach.

Former world number one Woods carded a one-under-par 70 to end Thursday's opening round five shots off the pace.

Woods – a three-time U.S. Open champion with his last triumph coming in 2008 – battled his way around the course in California, where he had three birdies and a double bogey on the front nine.

Despite not playing at his best, 15-time major winner Woods managed to stay within sight of leader Justin Rose.

"It's typical Pebble Beach where the first seven holes you can get it going, and then after that you're kind of fighting and kind of hanging on," Woods told reporters.

"I kind of proved that today. I had it going early and had to fight off through the middle part of the round and hung in there with pars. Very pleased to shoot under par today."

Woods said: "As I said, the first seven holes you can get it going, and you can be four to five under through the first seven holes. And then after that some of those were on the tricky side. They were hard to get it back and close to.

"Rosey kind of proved that today, kind of hang in there and fight it off. He had an amazing finish. I was in position to do the same thing, kind of hanging in there and was able to post an under par today."

"It seemed like the majority of the guys were under par through the first seven holes, and then nobody was making hay after that," Woods added. "And it was a little bit tricky."

Masters champion Woods will tee off on Friday in a tie for 28th alongside Jason Day, Adam Scott, Carlos Ortiz, Jason Dufner, Zach Johnson, Tyrrell Hatton, Matt Wallace, Rafa Cabrera Bello, Paul Casey, Jovan Rebula and An Byeong-hun.

Justin Rose reflected on a "cool moment" late in his first round at the U.S. Open after taking a one-stroke lead at Pebble Beach on Thursday.

The Englishman holed three straight birdies to finish his round, carding a six-under 65 to move into the outright lead.

Rose equalled the lowest round at a U.S. Open at Pebble Beach, matching Tiger Woods' 65 in 2000.

The world number four and 2013 champion said he briefly had a chance to appreciate the position he was in late in the round.

"I wouldn't say it's exhilarating, because I feel like my mindset is I am in a 72-hole tournament. This is just a very small step towards [an] outcome," Rose said.

"So you don't feel like that buzz that you would on a Sunday, but you can't help but look around over your shoulder, and damn, this is Pebble Beach, shot 65 and you're in the U.S. Open.

"It's a cool moment. Whatever transpires the rest of the week, it was a cool moment."

Rose mixed an eagle with five birdies and a bogey, picking up shots at 16 through 18 to take the lead.

The 38-year-old said remaining patient was the key to his opening round.

"You're going to make mistakes in the U.S. Open, but if you have a reason to stay patient, I think it's a lot easier to let those mistakes roll off your back and continue doing what you've been doing to get on top of the leaderboard," Rose said.

"There's more than one way to skin the cat, but I prefer this way."

Justin Rose produced a strong finish to take a one-stroke lead after the U.S. Open first round on Thursday.

The world number four made birdies on his final three holes to shoot a six-under 65 and grab the outright lead at Pebble Beach.

The 65 tied the lowest round at the U.S. Open at Pebble Beach, matching Tiger Woods in 2000.

Rose sits one shot in front of a four-way tie for second, which features Rickie Fowler, Xander Schauffele, Louis Oosthuizen and Aaron Wise.

Fowler, who is looking for his first major win, mixed six birdies with just one bogey.

"The execution was very good. I'm happy with the start," Fowler told reporters after his round. "You can't go out and win it on the first day, but you can obviously put yourself in a good position or take yourself out of it and you're having to fight back."

Fowler hit 13 of 14 fairways and 15 of 18 greens on his way to his 66. He finished with six birdies, with his only blemish a bogey at the ninth hole.

Schauffele has top-six finishes in three of his past five majors and a fortunate eagle at 18 put him in a tie for second.

"Lucky finish. I hit a toe ball there. The line I thought wasn't too aggressive," Schauffele told reporters after his round. "If I hit it solid I do have 290 in the air. But when you hit it off the toe and it's diving against a cut wind it usually doesn't work out. Luckily I hit the correct shot of a rock and it sort of careened down the fairway, 168 out. Very fortunate and happy we capitalised on a really lucky break."

Scott Piercy and Nate Lashley fired four-under 67s to be tied for sixth, a shot ahead of an eight-man group that includes Rory McIlroy and Francesco Molinari.

Two-time defending U.S. Open champion Brooks Koepka started hot but cooled off to finish his round at two under and in a tie for 16th.

Woods battled around the course but is still in range of the leaders at one under.

Justin Thomas struggled his way to a two-over 73 and Phil Mickelson shot a one-over 72.

Tiger Woods is in the U.S. Open despite a scratchy one-under 70 in the opening round on Thursday.

The 15-time major winner is five strokes adrift of leader Justin Rose despite not being at his best in the first round at Pebble Beach.

Woods struggled at times, but he did enough to keep himself in range of the leaders and can move up with a good round on Friday.

The American did a lot of scrambling as he had to hit some long putts just to save par, like on the 14th.

He was also clearly having trouble with his distance control as he was coming up a club short fairly often on his approaches.

But he did enough to keep himself in it by making par when he needed one.

After a double bogey at the fifth hole, Woods was able to erase his mistake with back-to-back birdies on his next two holes to get back into red numbers.

Stretches like that were huge for his round, even if he was clearly not at his best.

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