Bryson DeChambeau is fully embracing the atmosphere created by the so-called 'Brooksy bros' at the U.S. Open.

There is little love lost between defending champion DeChambeau and two-time winner Brooks Koepka, with their simmering rivalry one of the more intriguing sub-plots in golf during 2021.

At last month's US PGA Championship, a video of Koepka visibly frustrated at an interruption from DeChambeau went viral, which led to the pair trading back-and-forth jibes on social media.

Prior to the tournament, DeChambeau admitted the two just "don't like each other". On Sunday, as he contemplated going for the par-five 18th in two while in a sand trap, fans of Koepka yelled "go get 'em Brooksy" and "Brooks would go for it".

DeChambeau resisted the temptation to bite but when questioned about it after his round, the world number five insists he is relishing the rivalry.

"Hey, I love it. I think it's so much fun," said DeChambeau, who recorded his first ever bogey-free round in major golf to sit two back of leaders Mackenzie Hughes, Louis Oosthuizen and Russell Henley at three under at Torrey Pines.

"People think that it annoys me. If anything, it just creates a great atmosphere for golf. At first, I didn't really know how to handle it. You're kind of thrown into a situation. 

"But now I enjoy it. I think it's great. You've got to embrace it. There's going to be team Bryson, team Brooks out there, and hey, keep it up, I'm happy about it. 

"I'm excited that one day we can eventually get paired up and play together. It would be fun."

DeChambeau, who scored a three-under 68 in round three, is using driver at almost every opportunity in tactics similar to those he employed when winning at Winged Foot last year.

He says he has learned the nuances of coping with major golf.

"You've got to be really patient out here at these majors. It's something that is not easy to do," he added.

"My first few goes at majors, I was not successful or anywhere near successful, and I feel like I'm starting to understand major championship golf and how to play it and how to go about managing my game, my attitude and just my patience level. 

"If I can continue to do that [on Sunday], I think I'll have a good chance."

Jon Rahm is three off the lead after signing for a one-over 72 on Saturday. The Spaniard thinks being part of the chasing pack may actually play to his strengths.

"I feel like it's easy when you're in the lead to get a little tentative and start trying to be a little bit more safe in certain parts," he said. 

"I feel like when you're a couple shots back, you have nothing to lose early on. So, I feel like you can be a little bit more aggressive and try to get some birdies.

"There will be somebody who gets a fast start, and hopefully that's me tomorrow, and I get a fast start, and I get it going fast."

Since winning The Open in 2010, Oosthuizen has been a perennial nearly man in the majors, recording five runners-up finishes including play-off defeats at the 2012 Masters and 2015 Open, while he was tied second to Phil Mickelson at the PGA Championship last month.

The South African is aiming to take the positives from those experiences, though, saying: "The two that really hurt was the playoffs. That's so close to winning.

"You know, the other ones, just good weeks and good results. Could have been better but taking more positive out of it than anything else."

Oosthuizen drained an eagle at the par-five 18th, which drew a huge reaction from the galleries.

"A year ago, that would have been a very boring eagle with a few people going nuts. But that was nice to see everyone back," he said, alluding to the return of fans who were unable to attend in 2020 due to the coronavirus pandemic.

Bryson DeChambeau said his swing fix "came to him" in a dream after the U.S. Open champion kept his title defence alive.

DeChambeau opened his bid for back-to-back U.S. Open trophies with a 73 but the big-hitting American responded by posting a two-under-par 69 on Friday.

An eagle, four birdies and four bogeys saw DeChambeau surge 47 positions on day two, moving within five shots of co-leaders Richard Bland and Russell Henley at Torrey Pines.

Reflecting on his bounce-back display heading into the weekend, DeChambeau credited a late-night tweak.

"I was sleeping and it came to me in the middle of the night," DeChambeau told reporters.

"Woke up and I was like, hmm, I'm going to try this, and my intuition is pretty good, so I went out and tried it and it worked, just keeping the right wrist bent for a lot longer through impact."

"It's more just my intuition telling me there's something weird here, what's going on, and I couldn't figure it out for an hour and a half last night, an hour last night," said DeChambeau said. "Going back and just sitting down, eating dinner and just thinking about it, thinking about it, I literally won't talk to anybody for like an hour, just thinking, thinking, thinking, and sure enough, I went to bed and I found a little something that worked for my driver."

DeChambeau added: "I feel like if I can clean up my iron play and get a little more comfortable with the irons and the drivers, I'll have a good chance for this weekend."

He is tied for 13th alongside the likes of rival Brooks Koepka (73), Justin Thomas (69) and Collin Morikawa (67).

Amid their ongoing feud, DeChambeau and two-time U.S. Open champion Koepka narrowly avoided being paired together for Saturday's penultimate round.

Koepka – eyeing a fifth major crown – lost ground on the leaders after mixing five bogeys and just three birdies but he told reporters: "I feel right there. I feel like I'm in it. Just need to put two solid good rounds and put the ball in the fairway, and that's it. I love the way I'm putting. I love the way I'm striking it. Just need to keep doing it."

Four-time major winner and former world number one Rory McIlroy is a stroke further back following his second-round 73.

"A bit of a rollercoaster, got off to a good start," McIlroy said. "Made a couple of birdies early on and was under par for the round. Then I made a couple of mental errors and missed it in the wrong spots, and when you do that around this golf course, it's just really hard to see a par.

"I made a few bogeys, but birdieing two of the last four holes definitely makes me feel better about the round and gives me a nice bit of momentum going into tomorrow…So, yeah, in for the weekend and still feel like I've got a really good chance."

US PGA Championship winner Phil Mickelson also feels he can "make a run at it" after avoiding the cut on Friday.

Richard Bland upstaged a star-studded field to earn a share of the U.S. Open lead at the halfway stage as defending champion Bryson DeChambeau soared up the leaderboard.

Unheralded Englishman Bland, 48, powered to the top of the summit at Torrey Pines thanks to his four-under-par 67 in San Diego, where he continues to prove patience pays off.

Alongside Russell Henley (70) for the one-stroke lead after two rounds, Bland is benefitting from perseverance, having gone almost 20 years without a European Tour title.

At the 478th attempt on the European Tour last month, Bland claimed an emotional win at the British Masters, which earned him a place in his fourth major championship.

Bland – who missed the cut at his one previous U.S. Open appearance in 2009 – dazzled on day two of this year's tournament, storming into the clubhouse lead before being joined by American Henley.

After opening with a 70, Bland holed seven birdies and three bogeys to catapult himself to the top of the standings, before Henley teed off in his second round, amid his improbable dream of clinching a major.

"I feel good about my game," said three-time PGA Tour champion Henley, whose previous best performance at a major came via an 11th-place finish at the 2017 Masters.

"I've never been in this position before in a major. Just feel like I'm going to learn something no matter what happens."

Louis Oosthuizen (71), who was the overnight co-leader along with Henley, ended day two in a tie for third position alongside Matthew Wolff (68), while Bubba Watson (67) and Jon Rahm (70) are a shot further back at three under through 36 holes.

DeChambeau boosted his hopes of back-to-back U.S. Open titles, though the big-hitting American star remains five strokes off the pace heading into the weekend.

A two-under-par 69 saw DeChambeau move to even par as he rose 47 positions into a tie for 13th alongside rival and two-time U.S. Open champion Brooks Koepka (73), Justin Thomas (69), Collin Morikawa (67), Harris English (70), Branden Grace (70), Christiaan Bezuidenhout (70) and Adam Hadwin (72).

Koepka – eyeing a fifth major crown – lost ground on the leaders after mixing five bogeys and just three birdies, while Rory McIlroy followed his opening-round 70 with a 73 to be one over the card as world number one Dustin Johnson (73) ended the day two over.

US PGA Championship winner Phil Mickelson emerged from the jaws of elimination, qualifying for the weekend via a two-under-par 69 after his forgettable 75 on Thursday.

Masters champion Hideki Matsuyama (76), Adam Scott (75), Sergio Garcia (74), Patrick Reed (73) and Jordan Spieth (69) all avoided the cut, but Justin Rose (77) was not so fortunate at 13 over.

Brooks Koepka was pleased with his first round at the U.S. Open, while in-form Phil Mickelson was in an optimistic frame of mind despite struggling in San Diego.

On an interrupted opening day due to fog and weather at Torrey Pines, two-time U.S. Open champion Koepka finished two strokes behind co-leaders Russell Henley and Louis Oosthuizen (through 16) as play was suspended because of darkness on Thursday.

American star Koepka – chasing his fifth major title – set the standard with four birdies in his first 11 holes taking him into a solo lead.

However, two bogeys meant he had to scramble to recover as Koepka ended the day alongside Xander Schauffele, Hayden Buckley, Masters champion Hideki Matsuyama, John Rahm (through 17) and Sebastian Munoz (through 14).

Koepka, who has gone on to win or finish second in six of the last 10 majors which he opened with a score in the 60s, said: "You can't win it today but you can definitely lose it. It was nice to get off to a good start, putted well, drove it well on the back nine, my front, but missed a couple fairways there.

"I missed them on the correct side, which is what you've got to do, depending on where the pin location is and get lucky enough where you've got a decent lie and get it there.

"Pretty pleased. Not the best, but I'll definitely take it."

US PGA Championship winner Mickelson is already facing an uphill task following his four-over-par 75.

Mickelson, who became the oldest major winner when he clinched the PGA Championship ahead of Koepka last month, finished with five bogeys, including back-to-back on the front nine.

"It was a great set up and I had some chances to get the round a little bit better," Mickelson said. "Fought hard, made a lot of short putts to kind of keep myself in it and then I ended up bogeying six and seven.

"Two over would have been a pretty good round and I ended up at four, so I'm a little disappointed about that. I feel like I'm close to putting together a good round."

South African veteran Oosthuizen – through 16 holes – moved into a tie at four under after birdieing the 14th.

Winner of the 2010 Open Championship, Oosthuizen is one of three players to finish in the top 10 at each of the last two U.S Opens.

"I just enjoy playing really tough golf courses. I think somehow I focus a little bit better when I play those courses, knowing that the margin for error is really small," said Oosthuizen.

"Especially around this place, you've got to drive it well, you've got to start it in the fairway, and you're going to have trouble if you're missing fairways around this golf course and I've really been driving it good lately."

Four-time major champion Rory McIlroy birdied his final hole to move within three shots of the lead heading into the second round.

"It was really nice. The birdie is awesome," McIlroy – who posted a 70 – said. "I mean, that putt was pretty, I was sort of like, I think it's straight, I'll hit it straight and we'll see. But it was nice to get in, get an extra hour of sleep tonight and it was a bonus to birdie in as well."

Louis Oosthuizen joined Russell Henley in a share of the lead as the opening round of the U.S. Open was interrupted, while Phil Mickelson's quest for back-to-back majors got off to an awful start at Torrey Pines.

A fog-enforced delay meant the start of the major tournament was pushed back by around an hour and a half on Thursday, and while Oosthuizen was unable to finish his round, the 2010 Open Championship winner still ended the day alongside Henley atop the leaderboard.

Oosthuizen – one of three players to finish in the top 10 at each of the last two U.S Opens, joining Rory McIlroy and Xander Schauffele – moved into a tie at four under after birdieing the 14th hole in San Diego.

Henley had set the early pace after claiming an early lead behind his impressive four-under-par 67, which was enough for him to initially head back to the clubhouse with a one-shot lead over Francesco Molinari and Rafa Cabrera Bello.

It was Henley's sixth career score of 67 or better in a major championship and first since the 2018 US PGA Championship (65 in round two).

Molinari and Cabrera Bello remain a stroke off the pace heading into Friday, with the first round scheduled to resume at 06:50 local time.

Two-time U.S. Open champion Brooks Koepka is not far behind following his two-under-par 69 to kick off his pursuit of a fifth major crown.

Koepka, who finished second behind Mickelson at the PGA Championship, set the standard with four birdies in his first 11 holes taking him into a solo lead.

However, two bogeys meant he had to scramble to recover as Koepka ended the day alongside Schauffele, Hayden Buckley, Masters champion Hideki Matsuyama, John Rahm (through 17) and Sebastian Munoz (through 14).

Koepka has gone on to win or finish second in six of the last 10 majors which he opened with a score in the 60s.

World number one Dustin Johnson and star Rory McIlroy were both through 17 holes when play was called for the day.

Johnson had mixed a birdie with a bogey, while four-time major champion and 2011 U.S. Open winner McIlroy had an eventful start with three bogeys and four birdies.

Defending champion Bryson DeChambeau and his bid for back-to-back trophies started with a two-over-par 73.

American star Mickelson ended the round two shots worse off than DeChambeau following his forgettable 75.

Mickelson, who became the oldest major winner when he clinched the US PGA Championship last month, finished with five bogeys, including back-to-back on the front nine.

Tiger Woods began his U.S. Open bid with a double bogey in 2008 at Torrey Pines – "a terrible start", said the man who four days later took the title in a sudden-death play-off, after he and Rocco Mediate could not be separated in a two-man fifth round.

The 18-hole play-off scenario is now history, so there will no repeat of such a marathon effort as the major returns after 13 years to the San Diego course this week, and there will be no Woods either.

That 2008 triumph was a 14th major for the American, yet he had to wait another 11 years until the 15th arrived, the man who once seemed booked in to take the major titles record away from Jack Nicklaus having seen perceptions of his life switch from fairy tale to soap opera.

Woods in 2008 was privately fighting the pain of a double stress fracture of his left tibia that he kept under wraps. Yes, he won the U.S. Open with a broken leg.

Whoever lifts the trophy this Sunday is unlikely to have to overcome the tribulations that faced Woods across that long weekend, and the superstar's absence is sure to be felt ... until the first round begins to take shape and a new narrative plays out.

Back in 2008, tournament organisers upped the intrigue by grouping Woods, Phil Mickelson and Adam Scott – the world number one, two and three – together for the opening two rounds.

Local favourite Mickelson recalls the moment when Woods fluffed his opening hole.

"I thought that was pretty inspiring the way he didn't let that affect him," Mickelson said this week. "He stayed to his game plan, stayed focused, stayed patient, and ended up kind of picking his spots where he could get a shot back here or there, and he did, and he ended up winning. That's impressive."

After completing his opening round, Woods said his mindset after shooting six at the first was to "just be patient, long way to go", and he finished one over par.

By the end of day two, Woods stood tied for second place, with Mickelson and Scott in a group sharing 35th position.

"The atmosphere for the whole 36 holes that I played with Phil and Tiger was incredible," Scott recalled earlier this year. "But Thursday morning the energy around the first hole was like I can't compare it to anything else actually.

"It was not even like teeing off at the Masters or anything like that. The build-up ... Tiger obviously being Tiger and Phil, the local hero, one, two and three in the world, of course I was like the third wheel hanging off the back, but it was really fun to be a part of that."

Of course Woods is a once-a-generation talent, but should anyone make a similarly poor start this week, it would be wise to take the blow on the chin and move on.

This course, the long-time home of the annual Farmers Insurance Open, should reward a steady temperament.

Mickelson, fresh from his shock victory last month at the US PGA Championship, where he became the oldest winner of a major, described the Torrey Pines greens on Monday as "very challenging".

"There's a lot of pitch, a lot of contour, and as they get firmer, they're significantly firmer than just the last two days," he said.

"It's very difficult to get it to some of the pin positions, and it's going to be a difficult test. As long as it is at sea level it's going to be a difficult task, but it seems like the set-up is pristine, and it's going to be a fun, very difficult challenge."

WHO WILL WIN THIS TIME?

With Woods out of the picture, recovering from the car crash he was said to have been fortunate to survive in February, there will be no repeat of his famous success 13 years ago.

Woods has won the Farmers Insurance Open a record seven times too, so he would have been relishing this week. Brandt Snedeker and Jason Day are both two-time winners of that tournament, and Mickelson has been champion three times, but not since 2001.

Mickelson is seeking the trophy that would give him a career grand slam, but it seems fanciful to expect him to challenge, having rarely been a factor in the majors in recent years until his unexpected win at Kiawah Island.

Stats Perform has taken a combination of factors to build a list of potential contenders, assessing past performance at the Farmers Insurance Open but also weighting displays in majors and recent PGA Tour form.

These scores are built around performance at Torrey Pines from 2016 to this year.

In the calculations, top-10 finishers at the 2021 Farmers Insurance Open receive points on a scale from 15 for the champion down to six points for 10th place. This decreases on a year-by-year sliding scale to 10 points for the 2016 tournament winner and one point for 10th place in that event.

There is also two points awarded per top-10 finish on the PGA Tour in the 2021 season, and substantial points availability for recent major success (10 points per major title in 2020 and 2021, 8pts in 2019, 6pts in 2018, 4pts in 2017, 2pts in 2016).

Not all players in the U.S. Open field have played the Farmers Insurance Open each year, and some are rarely active, if at all, on the PGA Tour, but this may give an inkling of the players who could come into contention at the year's third major.

TONY FINAU, 52 points: Finau followed up three top-10 results at the Farmers (2017, 2018, 2020) by finishing a joint runner-up in 2021, pointing to a clear liking for the course. How he enjoys it later in the year than he usually encounters Torrey Pines remains to be seen. Finau also has seven top-10 finishes of tour in the 2021 season.

JON RAHM, 52 points: His first major title is arguably overdue, given his talent and week-by-week results. Rahm was Farmers champion in 2017 and runner-up in 2020, also finishing top 10 in 2019 and 2021. He has a tour-leading 10 top-10 finishes this season, and would surely have had a win at the Memorial Tournament earlier this month before a positive COVID-19 test ended his title charge after 54 holes.

PATRICK REED, 42pts: This year's champion at the Farmers Insurance Open, Reed was also top six there in 2020, has had six top-10 results on tour this season and landed a Masters title in his not-too-distant past.

RYAN PALMER, 33pts: Palmer tied for second earlier this year at Torrey Pines, just as he did in 2018. Those performances and his four top-10 finishes on tour this year make him perhaps the surprise name on this list.

BROOKS KOEPKA, 32pts: Koepka missed the cut this year at the Farmers and did the same in 2017, and he did not play the tournament in the intervening years. Although Koepka has little left to prove in a wider sense – his mountain of points here is accrued through past major wins and a healthy batch of top-10s this season – he has yet to master Torrey Pines. Koepka has also missed the cut at three of his most recent four tournaments this year.

RORY MCILROY, 31pts: Top-five finishes at the Farmers in 2019 and 2020 augur well for McIlroy, and his five top-10 finishes on tour this season is a tally he will aim to add to over the coming days. It may be asking a lot to expect him to carry off the title, but another high placing would seem realistic.

Next on the list: Justin Rose (30pts), Brandt Snedeker (29), Viktor Hovland (26), Xander Schauffele (26), Jason Day (25), Marc Leishman (25), Hideki Matsuyama (25) and Keegan Bradley (24).

Brooks Koepka's fitness was a topic of discussion prior to the US PGA Championship and while he secured a share of the runners-up cheque, the four-time major winner was "super disappointed" with his performance.

Koepka went head-to-head with Phil Mickelson, who came out on top by two strokes in a stunning display that saw the American veteran become the oldest major champion in golf history on Sunday.

A two-time PGA Championship winner, Koepka signed for a two-over-par 74 as he was unable to capitalise on Mickelson's final-round 73 in South Carolina.

Koepka's short game was his downfall – the 31-year-old ended with a double-bogey, four bogeys and four birdies to finish second alongside Louis Oosthuizen at Kiawah Island.

American star Koepka has been plagued by injuries since winning back-to-back PGA Championships in 2019 and a fourth major title in three years, undergoing knee surgery in March before missing the cut at last month's Masters but his title tilt did not mask his frustration.

"Just how bad I putted the last two days," Koepka said when asked what part of the result was hard to stomach. "Three days, actually. It felt like tap-ins I was missing. Never felt comfortable, and you're not going to win if you do that.

"The thing was, Phil played great. That whole stretch when we turned after four and five and played those holes, it's into off the left for me and that's quite difficult for a right-handed player. And it suited Phil right down to the ground, and I thought he played that entire stretch from about six to 13 so well. So you know, I'm happy for him... It's pretty cool to see, and you know, but a bit disappointed in myself."

"I'm super disappointed, pretty bummed," Koepka added. "I'm not happy. I don't know if there's a right word I can say on here without getting fined, but it hurts a little bit. It's one of those things where I just never felt comfortable over the putts. I don't know why, what happened.

"I spent all weekend, the weekend before working on it and it was great, and you know, just over did it. I was trying to get my hands a little lower and ended up getting my hands too far low one under and actually ended up getting further away from the ball. The last nine, I just tried to go back to what I've always done and I felt like I was hitting better putts. I just wish I would have done it sooner."

Oosthuizen – winner of the 2010 Open Championship – carded a one-over-par 73 to earn a share of second spot.

The South African recorded his best major performance since finishing tied for second at the PGA Championship in 2017.

"I feel like I'm playing my heart out to get a second major, and I do know I have the game to do it. This was close," said Oosthuizen.

"My game wasn't great on the weekend. It was better today than yesterday. So I just need to work harder on it to get myself in contention again."

Phil Mickelson remained on track to become golf's oldest major winner as he held a two-shot lead at the halfway stage of his final round at the US PGA Championship.  

The 50-year-old had ended Saturday's action at Kiawah Island with a one-stroke advantage over Brooks Koepka, who is seeking to win the tournament for a third time in four years.  

Mickelson's slender advantage disappeared with a three-putt bogey at the opening hole, setting the tone for an uneven front nine that saw him record just three pars but still reach seven under.  

The undoubted highlight was a wonderful chip from a tricky greenside bunker by the fifth green that found the cup, delighting a crowd that sensed they could be witnessing history in the making. 

Playing partner Koepka also had his struggles, following up an opening birdie with a double-bogey seven at the second. He sat at five under through nine, the same score as Louis Oosthuizen. 

Abraham Ancer had shown how it was possible to go low on Sunday, carding the best round of the week with a blemish-free 65 that owed much to a fast start.  

The Mexican birdied four of his opening six holes before picking up a further shot prior to the turn, seeing him go out in 31 strokes. While he cooled off on the way back in, it was still an impressive display.  

While his charge came too late to mount a challenge for the tournament, Ancer feels his superb score is a further sign of how he is getting close to making a major breakthrough in his career.  

"I usually like golf courses that are going to be tough, it's not just going to be a birdie-fest and you have to grind it out and have to hit the ball well where you are supposed to," he told Sky Sports.  

"It's not that I don't care about other events, I try to think about every event the same and try to win every time, but I do feel my game is better for golf courses that are tougher." 

Brooks Koepka is exactly where he expects to be heading into the final round of a major, particularly the US PGA Championship. 

After carding a two-under-par 70 on Saturday, Koepka sits one stroke back of leader Phil Mickelson at six under for the tournament, putting him in position to win his fifth major championship. 

Considering Koepka has been no worse than tied for fourth after 12 of the last 13 rounds at the PGA, his spot in Sunday's final pairing is familiar territory. 

"It just feels good, feels normal," Koepka told reporters after his round. 

"It's what you're supposed to do, what you practice for.

"I'm right where I want to be, and we'll see how tomorrow goes.

"Just be within three of the lead going into the back nine and you've got a chance."

Koepka trailed Mickelson by five strokes at one point Saturday but saw the five-time major winner slide back to him on the back nine. 

A bogey on 18 denied Koepka a chance to match Mickelson at seven under, but the 2018 and 2019 PGA winner is looking forward to a potential one-on-one showdown in the final round. 

"I can see what he's doing, and everybody else is in front of me, so I'll have a good idea on the leaderboard what's going on and just need to putt better -- simple," Koepka said.

"If I strike it anything like I did the last three days, I'll have a chance."

If he can pull it off, Koepka would become the first player to win the same major three times in a four-year stretch since Tom Watson captured the Open Championship title in 1980, 1982 and 1983.

Though the wind that had made scoring difficult at Kiawah Island's Ocean Course the first two days died down a bit Saturday, Koepka anticipates a challenging final round. 

"it's a tough golf course," he said. "I thought it definitely played easier for sure, but this golf course you can make one little mistake and it can be costly.

"That's why it's a major championship. I think this place is perfect for it, and it will be fun to watch tomorrow."

Phil Mickelson and Brooks Koepka both shot 70 Saturday to set up a mouth-watering final pairing at the US PGA Championship. 

At seven under par for the tournament, Mickelson holds a one-stroke lead over his countryman entering the final round at Kiawah Island's Ocean Course after saving par on 18 while Koepka bogeyed the last. 

The 50-year-old Mickelson is the fourth player aged 50 or older to lead a major after three rounds in the modern era, which began in 1934. 

The others were Tom Watson at the 2009 Open Championship, Greg Norman at the 2008 Open, and Julius Boros at the 1973 US Open -- none of whom ended up holding on for the win. 

Mickelson has been resilient this week in South Carolina, though, steadying himself Saturday after going bogey-double bogey on 12 and 13 to make par on the final five holes. 

While Mickelson's resurgence has excited the fans, Koepka remains a model of consistency at the PGA.

He has finished at least tied for fourth in 12 of the last 13 rounds at the major, and he could become the first player to win the same major three times in a four-year stretch since Watson won the Open in 1980, 1982 and 1983.

Mickelson will be shooting for his sixth major title and first since the 2013 Open, while Koepka seeks his fifth. 

Louis Oosthuizen, who shared the lead with Mickelson entering play Saturday, managed just three birdies on the day on the way to an even-par 72 that left him five under for the tournament. 

American Kevin Streelman (70) is at four under, while Oosthuizen's South African countrymen Branden Grace and Christiaan Bezuidenhout are at three under after even-par rounds of their own. 

Bryson DeChambeau (71) was unable to gain ground on the leaders and enters Sunday five back of Mickelson along with Gary Woodland (72) and Joaquin Niemann (71). 

Jordan Spieth matched Billy Horschel for the low round of the day with a 68, and he sits at even par for the tournament along with Rickie Fowler (69) and Keegan Bradley (72).

Reigning Masters champion Hideki Matsuyama fell from contention with a 76, putting him at one over with the likes of Shane Lowry (73), Padraig Harrington (73) and Ian Poulter (73). 

Phil Mickelson and Louis Oosthuizen topped a leaderboard filled with major winners at the US PGA Championship, setting up a fascinating weekend at the Ocean Course at Kiawah Island. 

Mickelson started early and roared to the finish, carding five birdies on the back nine on the way to a 69 that left him at five under par for the tournament before Oosthuizen shot 68 in the afternoon for a share of the overall lead. 

Two-time US PGA winner Brooks Koepka (71) was one stroke back after recording a pair of eagles on Friday, followed by 2021 Masters champion Hideki Matsuyama (68) at three under. 

Oosthuizen's fellow South Africans Branden Grace (71) and Christiaan Bezuidenhout (70) also were two back of the leaders. 

First-round leader Corey Conners (75) and 2019 U.S. Open winner Gary Woodland (72) were at two under, with reigning U.S. open champion Bryson DeChambeau (71) dropping back to one under after a bogey on 18. 

Players battled windy conditions throughout the day and had an especially difficult time with the last two holes.

Oosthuizen lost his chance to stand alone atop the leaderboard with a bogey on 18 that ensured no one would post a bogey-free round on the first two days of competition, while Grace dropped three strokes on 17 and 18 to mar an otherwise stellar round.

Rory McIlroy (72) saw a move for contention disintegrate with bogeys on the final three holes that left him eight back of the leaders entering Saturday, and Jordan Spieth (75) was in the same spot after bogeys at 17 and 18.

The four-time major champion Koepka had perhaps the most erratic day of any contender, carding just one birdie to go with his eagles at the seventh and 11th and four bogeys. 

Among the notables missing the five-over cut line by one stroke were Dustin Johnson (74), Sergio Garcia (73), Adam Scott (72) and Justin Thomas.

Former major winners also missing out on the weekend include Zach Johnson (78), Jason Dufner (81), Martin Kaymer (77), Rich Beem (77), Charl Schwartzel (79) and John Daly (86). 

The 2009 US PGA Championship winner, Y.E. Yang, was disqualified after signing an incorrect scorecard but would have missed the cut anyway. 

Brooks Koepka dismissed concerns over his knee, insisting he does not have to be "100 per cent" after impressing on day one of the US PGA Championship.

Koepka ended the opening round two strokes behind leader Corey Conners and tied for second position following his three-under-par 69 on Thursday.

American star Koepka has been plagued by injuries since winning back-to-back PGA Championships in 2019 and a fourth major title in three years, undergoing knee surgery in March before missing the cut at last month's Masters.

Koepka overcame a slow start after double-bogeying his opening hole in windy conditions as he made history in South Carolina.

The four-time major champion has opened the PGA Championship with a score in the 60s in each of the last six years, the longest such streak at any major in the modern era (since 1934), eclipsing Jack Nicklaus (five – 1972-1976 Masters).

"It's a major. I'm going to show up," Koepka said when asked about his fitness and whether it was the best he has felt since returning from injury. "I'm ready to play. I've been itching to do this since Augusta.

"I mean, I feel so much better now. I don't need to be a hundred percent to be able to play good."

"I love it when it's difficult," said Koepka. "I think that's why I do so well in the majors. I just know mentally I can grind it out. Like when it's windy like this, it's not so much putting, it's more about ball striking, and I felt like I struck it really well today. I feel like that's why I've done really well.

"You've got to understand that sometimes par is a good score. You've got to understand that 30, 35 feet is a great shot sometimes, and you've just got to accept it and move on."

Defending champion Collin Morikawa closed out day one a shot further back at two under.

Morikawa mixed five birdies with three bogeys to end the round three strokes off the pace at Kiawah Island Golf Resort.

He played alongside big-hitting Bryson DeChambeau (72) and praised the reigning U.S. Open champion.  

"I think people need to give him credit, starting today, that he's actually picking up the pace," Morikawa said. "It was amazing how fast he actually played. I'm not going to say fast, but he wasn't slow. You weren't just waiting on him to figure out whatever.

"Kudos to him because it was windy and he had to figure out some stuff for sure. But I enjoy it. He's a character. He's his own person. That's what makes Bryson, Bryson. I think that's why people love him. I enjoy playing with someone like that. It's not going to faze me that he hits it a hundred past me. I know I can still hit it and play golf."

DeChambeau, who heads into the second round tied for 31st, added: "The wind just kicked my butt. It's hot. Just grinding out there, it takes a lot out of you. Working really, really hard to hit every shot the exact way I want to, and then it doesn't happen, and you've got to be comfortable with it and going, okay, how do I get up-and-down.

"It's windy and you're over a four-footer. Wind is blowing really hard, and you think it's going to break. When the wind stops, it's not going to break. It's all just a really difficult thing that you've got to control out there. It's a lot of work."

Corey Conners withstood hammering winds to claim a two-stroke lead following the opening round at the US PGA Championship as Brooks Koepka impressed but Rory McIlroy and Dustin Johnson struggled.

Prior to Thursday's first round in South Carolina, Conners' best position after any round of a major was equal sixth through 54 holes at this year's Masters at Augusta.

Conners bettered that at Kiawah Island Golf Resort, where the Canadian defied the wind to set the early pace with a five-under-par 67.

Without a victory since his solitary PGA Tour triumph at the 2019 Texas Open, Conners was almost flawless in gusty conditions, holing six birdies with just one bogey.

Conners' lead marks his third career 18-hole lead/co-lead on the PGA Tour (0-for-two to date) and first at a major. Earlier this season, the 29-year-old was tied for the first-round lead at the Arnold Palmer Invitational and finished third – his best result of the season.

Koepka ended day one in a share of second position alongside Keegan Bradley, Viktor Hovland, Aaron Wise, Sam Horsfield and Cam Davis.

Koepka has been plagued by injuries since winning back-to-back PGA Championships in 2019 and a fourth major title in three years – the American star underwent knee surgery in March before missing the cut at last month's Masters.

But Koepka impressed on Thursday, overcoming a slow start to shoot a three-under-par 69.

Koepka double-bogeyed his opening hole on the back nine, however, the four-time major champion only dropped one shot after that as he tallied six birdies.

He has opened the PGA Championship with a score in the 60s in each of the last six years, the longest such streak at any major in the modern era (since 1934), eclipsing Jack Nicklaus (five – 1972-1976 Masters).

Defending champion Collin Morikawa is a stroke further back alongside the likes of five-time major winner Phil Mickelson.

Big-hitting American and reigning U.S. Open champion Bryson DeChambeau signed for an even-par 72 at the close of the first round, level with Jon Rahm and Justin Rose, while Masters holder Hideki Matsuyama, former world number one Jordan Spieth – eyeing a career Grand Slam – and Xander Schauffele shot 73s.

Jason Day and Patrick Reed were also further down the leaderboard as two-time PGA Championship winner McIlroy and world number one Johnson were powerless in the wind.

McIlroy – seeking a first major trophy since 2014 – recorded a three-over-par 75, which included six bogeys and just three birdies.

Justin Thomas also went three over for the day, while Johnson finished with two double-bogeys and a bogey in a forgettable four-over-par 76 display.

Rory McIlroy struggled on his return to Kiawah Island with a three-over-par 75 in the opening round at the US PGA Championship as playing partner Brooks Koepka impressed.

McIlroy won by eight shots the last time the PGA Championship was staged at Ocean Course in South Carolina in 2012 and was installed as the favourite of many after ending a winless streak of almost two years at the Wells Fargo Championship two weeks ago.

However, the four-time major champion – seeking a first major title since 2014 – landed his very first shot into the water on a windswept morning before recovering somewhat with back-to-back birdies on Thursday.

McIlroy – a two-time PGA Championship winner – was level par at the turn after dropping another shot on the par-five 16th, but he managed just one more birdie compared to five bogeys as he closed for 75, eight shots behind Corey Conners.

Koepka played down expectations heading into the tournament due to a knee injury and he started slowly with a double-bogey on his first hole, though the two-time PGA Championship winner recovered well with two birdies in the next three holes.

After turning in 36, Koepka picked up three shots in four holes on the front nine to complete an impressive turnaround that saw him earn a share of the lead before Conners soared to the summit as he aims to add to his successes in this event in 2018 and 2019.

"I felt like an idiot," he told Sky Sports Golf when reflecting on his cagey start. "It was probably a poor club choice off 10. I thought three-wood would have carried, but it didn't. I also didn't find the face, it barely hit the face!

"The first rule is, if you're in trouble, get the hell out. I couldn't reach the green and it was a bad lie, so I didn't know where I was going. I just tried to hit a sand-wedge up by the green instead of just chopping it out.

"So it was a mental mistake there, and I deserved every bit of that double-bogey. But it kind of helped me refocus. I can't play with any mistakes, maybe one a day, and that was my one, and I got it out of the way on the first hole."

Koepka is joined on three-under par by former champion Keegan Bradley, Viktor Hovland. Aaron Wise and Sam Horsfield.

Bradley's opening round included four birdies and just one dropped shot, coming on the par-four 13th, while Hovland bounced back from an opening bogey with four birdies.

Collin Morikawa is one shot further back after bogeying his final hole, the defending champion joined on a first-round 70 by Martin Laird, who was also let down by a couple of dropped shots on his final two holes.

Justin Thomas finds himself way down the standings, meanwhile, after carding a three over that included a double-bogey on the 18th, while US Open champion Bryson DeChambeau had a mixed first day as he posted a level-par 72.

World number one Dustin is among the late starters, along with Jordan Spieth, Tommy Fleetwood and Justin Rose.

Brooks Koepka said he can play through the pain in his bid for a third US PGA Championship but a full recovery from a knee injury remains months away.

Koepka has been plagued by injuries since winning back-to-back PGA Championships in 2019 and a fourth major title in three years.

The American star underwent knee surgery in March, having won the Phoenix Open, and he has missed the cut in his past two events, including last month's Masters.

As Koepka gears up for Thursday's opening round at Kiawah Island Golf Resort in South Carolina, the 31-year-old acknowledged his knee is still problematic but he is ready to play.

"I feel like I can hit every shot. It's not like Augusta where I'm trying to figure out what's the best line to walk instead of figuring out. Now I can actually hit golf shots and understand what's going on," Koepka, who has been paired alongside Justin Thomas and Rory McIlroy told reporters on Tuesday.

"For a while it was just I neglected putting just to see if I could hit shots, because if I can't hit shots I can't play. No point in that. No, I got everything under control and know what I'm doing. Last week was a good test just to see where I'm at for two days.

"I thought if I got four, it would be nice, but two days of rest didn't hurt me."

Asked for a timeline for him to be fully healthy, Koepka replied: "We're talking probably another six months."

"If I beat that, I'm doing something good," he continued. "I mean, I can play. You're never 100 per cent, that's the thing. For two straight years it's been left knee, right knee, herniated a disc in my neck, played in Tampa or wherever we were, played through that. I dealt with that all the way through Palm Springs.

"I can deal with the pain. That's not an issue. It's just a matter of being able to hit shots that I want to hit and do things I want to do, and I'm starting to be able to do that. Even though I'm not 100 per cent, I can still hit the shots."

Koepka added: "Every day has been a long day. Starting from just the training to the rehab, everything seems to take an hour, hour and a half longer, more attention to detail of what I'm doing off the golf course, make sure I'm doing -- I seem to get hurt in a bunch of freaky instances.

"It's just one of those things where you've just got to move past it and take it one day at a time."