Australian Cameron Smith holds a one-stroke lead after the opening day of the PGA Tour's calendar year-opening Tournament of Champions in Hawaii on Thursday.

Smith carded an eight-under-par 65 which included two eagles along with five birdies and one bogey to claim the lead ahead of three players including world number one Jon Rahm on seven under.

Rahm is tied with American pair Daniel Berger and Patrick Cantlay following rounds of 66 in good conditions.

More than half of the 38-player field broke 70 in the conditions, although Grand Slam winners Phil Mickelson, Jordan Spieth (both 71) and Justin Thomas (74) were not among that group.

Top-ranked Rahm and PGA Tour Player of the Year Cantlay were both returning to competitive golf after several months off and made fine transitions.

The Spaniard had seven birdies and no bogeys in his round, while Cantlay started with a bogey but finished in style, with four birdies and an eagle in his final five holes.

Berger might have shared the lead with Smith if not for a bogey on the penultimate hole, having made five birdies on his front nine.

Erik van Rooyen, Kevin Na and Sungjae Jim are six under, while world number two Collin Morikawa and four-time major winner Brooks Koepka are among five players at five under.

Top 20 trio Bryson DeChambeau, Xander Schauffele and Hideki Matsuyama are also not far off the pace after opening rounds of four-under for 69.

Bryson DeChambeau and Brooks Koepka hugged as the USA's resounding Ryder Cup triumph brought about a friendly truce in their apparently bitter feud.

The American pair have been at loggerheads on the PGA Tour and appeared to have taken against one another, but all was calm in Steve Stricker's ranks at Whistling Straits.

A 19-9 victory over Europe was secured on Sunday, with DeChambeau and Koepka among the singles winners, and television cameras picked out the pair shaking hands and embracing afterwards, a job well done.

Their seemingly incompatible personalities raised fears of friction, but Stricker revealed that DeChambeau and Koepka even wanted to play as a pairing.

Whether the creases in their relationship have been ironed out for good remains to be seen, but it was a day to savour for both.

DeChambeau, a member of the team beaten in Paris three years ago, said of his first cup experience on home soil: "It's unbelievable, the atmosphere is electric, and I wouldn't want it any other way. It's quite a scene, one to remember for a lifetime. As a team, we performed really, really well.

"We came together and had unity here this week. Even though we are competitors, we can all be friends and have unity."

Amid the stunning success for the USA team, there was a standout performer, with Dustin Johnson winning all five of his matches.

That made him just the third player in the history of matches between the USA and Europe, going back to 1979, to post a 5-0-0 record, after Larry Nelson in 1979 and Francesco Molinari in 2018.

Prior to 1979, the US faced teams from Great Britain and, from 1973 to 1977, Great Britain and Ireland.

Johnson said of his achievement: "Starting the week, if you had told me I was going to go 5-0-0, I probably would have said you were crazy. I didn't think I was going to play five matches.

"But obviously it was a great week. The team played amazing. All of us came together and we only wanted to win it. I think we just wanted it a little bit more."

The 37-year-old found himself in the unfamiliar role of being the elder statesman in the US line-up.

"On the other teams I felt like I was a younger guy on the team," he said. "A little different dynamic. The guys all got along great. We all have one thing in common, we do not like to lose. We had a great week, and it showed."

Bryson DeChambeau insisted the job is not over for the United States after racing clear of Europe on day one in their quest to wrestle back the Ryder Cup.

Team USA have their biggest opening-day lead at the Ryder Cup since 1975 thanks to a dominant start – DeChambeau and his team-mates earning a commanding 6-2 advantage on Friday.

Ryder Cup holders Europe struggled for answers at Whistling Straits, where hosts USA starred in the morning foursomes and afternoon four-balls.

DeChambeau teamed up with Ryder Cup rookie Scottie Scheffler in the four-ball, halving their matchup against world number one Jon Rahm and Tyrrell Hatton.

Powerhouse DeChambeau hit an astonishing 417-yard drive on the 581-yard par-five fifth hole, setting up an eagle to put himself and Scheffler one up in their four-ball contest with Rahm and Hatton.

Reflecting on the team's red-hot start, DeChambeau told reporters: "Proud of the team. Super proud.

"They fought hard every single shot out there, from what I saw, and, again, looking back on it, this is a great start, but the job's not over. We have two more days. A lot more golf. And we cannot lose our mindset to win."

On DeChambeau's fifth-hole bomb, Scheffler added: "That was probably the most excited he's ever been on a golf course was on number five. That wind, we had it on one of our practice days, and we figured out what he needed to do, so to have an opportunity to do that in competition was amazing. I was jacked up for him as well.

"I think he pushed it a little bit, but he smashed it. So thankfully he pushed it just a touch. If he pulls that ball at all, it's weird, there are two towers behind the green, I can't even describe to you - they are like 250 or 200 yards right of where I'm trying to hit my drive, and it's crazy for him to be able to commit to that shot.

"I know he's very happy to make a three as well; if he made a five, he said he was probably going to go home. It was great. That was a good spark for us and good momentum for the rest of the day."

Tiger Woods is absent from this year's Ryder Cup as the 15-time major champion continues his recovery from the February high-speed car crash near Los Angeles that left him with serious leg injuries, and it remains to be seen whether he is capable of playing again on tour.

Despite not being among Team USA's Ryder Cup roster, the American superstar still had a telling influence on Friday, having reached out with a few words of encouragement.

Xander Schauffele revealed Woods sent a message on Thursday and Tony Finau elaborated on the text.

"Harry [Harris English] mentioned to me walking down number nine, like how cool it was that Tiger is so into it," Finau said during his post-round news conference. "I think that's the big thing is he's so invested in this team.

"He's not here physically, but you know, I think the gist of basically what he was saying was I'm cheering you guys on, I'm right there with you and go fight and make us proud.

"We were able to do that, and if TW's watching, thanks for that text, brother, I think it helps us a lot."

The United States snatched their biggest opening-day lead at a Ryder Cup since 1975 as they powered 6-2 ahead of Europe at Whistling Straits.

All of Europe's worst fears were realised on Friday as the cup holders left themselves with everything to do over the weekend.

Rory McIlroy, rather than proving a talisman, suffered two heavy defeats, with world number one Jon Rahm's excellence not enough to prevent a landslide as Steve Stricker's American team dominated.

Rahm and Sergio Garcia put the first point of the day on the board, beating Justin Thomas and Jordan Spieth, but the home side bossed the rest of the morning foursomes to seize a 3-1 lead. Two more wins in the afternoon, and two halved matches, meant another 3-1 session for the USA, who will now look to assure themselves of a big lead heading into Sunday's singles.

There were shots that caught the eye, including an astonishing chip up a steep bank from Spieth in the morning and a 417-yard bomb from Bryson DeChambeau in the afternoon fourballs.

But it was consistent quality from the US team that put them in such a commanding position, with Dustin Johnson and Xander Schauffele both winning twice, including as a pair in the fourballs.

Johnson said: "Today was a great day for both me and Xander, and we both won our matches in the morning and this afternoon. Couldn't have been any better."

Patrick Cantlay, the PGA Tour Player of the Year, played with Schauffele in the morning as they trounced McIlroy and Ian Poulter 5 and 3, and he was then part of the last match of the afternoon, as he and Thomas came from three behind to halve against Viktor Hovland and Tommy Fleetwood.

"For sure I was feeding off JT a little bit, he was carrying me around all day today, he played great," Cantlay said. "Three and one in both sessions, that's a great start. Hopefully we can keep the pedal down and keep doing more of the same."

Europe's fortunes were summed up when Fleetwood hooked his tee shot at 16 into Lake Michigan, with Thomas holing a silky eagle putt to win that hole.

There was a huge boost for Europe, however, when Tyrrell Hatton holed a clutch putt at 18, winning the hole as he and Rahm snatched a half point against Scottie Scheffler and DeChambeau.

Rahm said: "I'm not going to lie: when I hit my bunker shot at 16 and we both had over 15 feet for birdie and they were both within 10 feet, things did look dark, to say the least. Luckily I was able to roll mine in and I told him [Hatton] that we can finish strong and still get this done.

"Not many people are as clutch as he is under pressure and he showed it right here so hopefully this gives him a lot of confidence for tomorrow and we get the ball rolling."

Shot of the day

Spieth conjured up an incredible shot on the 17th after playing partner Thomas had seemingly left him in an impossible position.

Spieth somehow chipped to around four feet away from the pin from the bottom of a steep bank in thick grass beyond railway sleepers. Spieth hurtled down to the edge of the water following his great escape, but his exploits were not enough to prevent Spanish pair Rahm and Garcia claiming the first point of the competition.

The three-time major champion said: "it's kind of one of those shots that you practice as a kid for fun, and you don't ultimately want to have it. And the chances of it going there, you could roll a thousand balls off the green, and it's not going it stay where it was.

"I hit like a 52-degree because a 60 might have gone over the back of my head and just tried to flick it right underneath and hit it as hard as I could, as high as I could."

Player of the day

At his fifth Ryder Cup, Johnson played like he is sick of that losing feeling, having known it three times already. He and Schauffele were a strong pairing in the afternoon, while Johnson guided Collin Morikawa through the morning foursomes. As McIlroy floundered for Europe elsewhere on the course, the US team had a seasoned member of their team step up and lead.

Chipping in

McIlroy: "Xander, Patrick, played wonderful, and Tony – I haven't seen Tony putt as good as that in a long time. When you have got a couple of pairs like that on form, on a difficult golf course where it's sort of hard to make birdies and they go on runs, if you're not quite 100 per cent on top of your game, it's tough. We can come back from 6-2."

Johnson: "Obviously we have a lot of support on our side, and MJ [Michael Jordan] is out there, he's a huge supporter of the Ryder Cup and huge supporter of golf, but it's nice to see him come out and support us."

Tony Finau: "You've just got to enjoy it. All these people out here cheering us on, that's the biggest thing. You have to enjoy it. I learned that in Paris, and the more you can just have fun with it, it seems to keep you loose, and I was able to roll the rock nicely today."

A little birdie told me...

Garcia is Europe's top points-scorer in Ryder Cup history and the Spaniard matched Nick Faldo's record tally of 23 match wins when he and compatriot Rahm drew first blood in the morning session.

Powerhouse  DeChambeau hit an astonishing 417-yard drive on the 581-yard par-five fifth hole, setting up an eagle to put himself and Scheffler one up in their four-ball contest with Rahm and Hatton.

Friday's foursomes results

Jon Rahm and Sergio Garcia (Eur) beat Justin Thomas and Jordan Spieth (USA) 3 and 1
Dustin Johnson and Collin Morikawa (USA) beat Paul Casey and Viktor Hovland (Eur) 3 and 2
Brooks Koepka and Daniel Berger (USA) beat Lee Westwood and Matt Fitzpatrick (Eur) 2 and 1
Patrick Cantlay and Xander Schauffele (USA) beat Rory McIlroy and Ian Poulter (Eur) 5 and 3

Friday's four-ball results

Dustin Johnson and Xander Schauffele (USA) beat Bernd Wiesberger and Paul Casey (Eur) 2 and 1
Scottie Scheffler and Bryson DeChambeau (USA) halved with Jon Rahm and Tyrrell Hatton (Eur)
Harris English and Tony Finau (USA) beat Rory McIlroy and Shane Lowry 4 and 3
Justin Thomas and Patrick Cantlay (USA) halved with Viktor Hovland and Tommy Fleetwood (Eur)

US Ryder Cup captain Steve Stricker says the bubbling feud between top 10 pair Bryson DeChambeau and Brooks Koepka will be a "non-issue" at this weekend's team play event at Whistling Straits.

DeChambeau and Koepka have a history of trading public blows, having never hidden their dislike for one another.

Koepka called out DeChambeau for slow play in 2019, while the 2020 U.S. Open champion poked fun at the four-time major winner's physique in January last year.

DeChambeau's coach Mike Schy said this week that the 28-year-old wants to end the dispute, with that sentiment reiterated by Stricker prior to the Ryder Cup which starts on Friday as the US seeks to reclaim the trophy from Europe.

"It’s a non-issue, really, for me and the team," Stricker said. "We got together a few weeks ago and I’ve had conversations with them both.

"They have assured me it’s not going to be an issue. I have no worries whatsoever."

The US Ryder Cup team features 2021 Open Championship winner Collin Morikawa, 2020 Masters champion Dustin Johnson, Justin Thomas, Patrick Cantlay along with DeChambeau and Koepka.

Stricker unsurprisingly admitted that the latter two would likely not be paired together for the team play event.

"Will we pair them together? I don’t think so at this point but things could change," Stricker said.

"Could always happen but probably not. Again, I had a dinner; they all showed up. We had great conversation, great talks.

"I’m not seeing it as an issue at all and they are completely on board."

Stricker also revealed that 15-time major winner Tiger Woods will not attend the Ryder Cup this weekend as he continues his rehabilitation from his February car accident.

Woods, 45, sustained multiple leg injuries in the single vehicle collision accident.

"I think it’s just not a good time for him to be here physically because of where he’s at in his rehabilitation," Stricker said.

"It’s a tough course to walk. Everybody is going to see it, from tee-to-green, it’s difficult."

Woods has taken up roles at the past four international competitions with the US, including playing captain at the 2019 Presidents Cup and is passionate about team play.

"He's been obviously in my ear a lot and I call him pretty regularly," Stricker said. "He's part of our Ryder Cup team. He's part of what we do."

Stricker added: "He’s getting better and his focus and mine is on making a comeback to play again. We don’t want to get in the way of that because we would all love to see him come back and play."

Bryson DeChambeau endured a wild third round, but the FedEx Cup play-off hopeful still ended the day tied for the lead alongside Patrick Cantlay at the BMW Championship.

DeChambeau carded a five-under-par 67 to earn a share of the three-stroke lead through 54 holes at the second FedEx Cup play-off tournament on Saturday.

The 2020 U.S. Open champion's round had a little bit of everything, from back-to-back eagles to back-to-back shots in the water at Caves Valley Golf Club in Maryland.

DeChambeau was flawless on the front nine, mixing two eagles and as many birdies as he turned a one-shot deficit into a three-stroke lead within two holes.

The 27-year-old is the fourth player to make back-to-back eagles this PGA Tour season, while he is only second to Cam Davis (20) for most eagles (19).

Just as DeChambeau threatened to run away from the field, the big-hitting American stumbled, settling for a share of top spot after finding the water at the par-five 12th hole (bogey) and par-three 13th (double bogey).

"It was definitely colourful," DeChambeau – projected to be second in the FedEx Cup points race – told PGA Tour radio. "Thought I played pretty well the front nine, did mis-hit a drive on seven.

"Felt weird. From then on out I wasn't driving it very well, so that's what I'm going to do, work on that for tomorrow. If I can get that straightened out like I did the first few days, off the tee the first couple holes today, I mean, I'll give myself a great chance again."

Cantlay – the current FedEx Cup leader – is also 21 under heading into Sunday's final round following his six-under-par 66.

He was almost bogey-free on day three, holing an eagle and five birdies before bogeying the last.

Im Sung-jae is the nearest challenger after his third-round 66, while Rory McIlroy (65), Abraham Ancer (66), Sam Burns (65) and Sergio Garcia (67) are tied for fourth at 17 under.

World number one and defending champion Jon Rahm lost ground, dropping to outright eighth – five shots back – after a two-under-par 67.

FedEx Cup champion Dustin Johnson posted a seven-under-par 65 to be 14 under, while Brooks Koepka (69) ended the day a further four shots behind – two strokes better off than Justin Thomas (69).

Abraham Ancer thought he had blown his shot at his first PGA Tour win the first time he played the 18th hole on Sunday. Turns out he just needed two more chances on the hole to make it happen. 

Ancer birdied the second playoff hole from six feet and watched as Sam Burns missed almost the same putt to give him the WGC FedEx St. Jude Invitational title as the third man in the playoff, Hideki Matsuyama, also made par. 

After finishing as runner-up four times in his previous 120 Tour starts, Ancer finally prevailed in Memphis to become the ninth first-time winner this season and the fourth player from Mexico to win on Tour. 

"This is surreal," he told CBS. "I thought I left so many shots out there on the back nine, but you never know. Golf is crazy.

"There's been some times that I felt like I made enough birdies to win and I didn't win. This is kind of how it goes and I'm happy that I got lucky."

A significant portion of that luck came on the first playoff hole, when Matsuyama had a chance to win it but saw his long putt for birdie on 18 lip out, sending the trio back to the 18th tee for another go.

The 2021 Masters champion turned in the round of the day just to make the playoff, firing a bogey-free seven-under 63 to fly up the leaderboard on the final day. 

Burns was close behind with a 64, a double bogey on 13 his only blemish. 

Harris English, who held a two-stroke lead after each of the first three rounds, watched those three fly by him as he slumped to a three-over 73 and finished fourth after opening the tournament with rounds of 62, 65 and 65. 

English bogeyed the opening hole before regaining his stride with three birdies, but he did not make another after the eighth hole, posting double bogeys at 11 and 14 and a bogey at the par-five 16th. 

The American said afterward that a warning for slow play on the front nine knocked him out of rhythm and he felt like he was rushing the rest of the day.

His playing partner Bryson DeChambeau had an even more difficult time after working himself into contention with a 63 on Saturday. 

DeChambeau carded a triple-bogey six on the 11th and also did not manage a birdie on the back nine on the way to a 74 that left him tied for eighth at 12 under for the tournament. 

Rough as that triple was for DeChambeau, honours for worst hole of the day went to Kim Si-woo.

The South Korean hit five successive shots in the water at the 11th on the way to a 13 – the worst score on a par-three hole on the PGA Tour since 1983, not including majors.

Among other notables, Dustin Johnson (70) tied for 10th at 11 under, one stroke better than Rory McIlroy (66) and Jordan Spieth (67).

Phil Mickelson (68) finished at seven under along with Louis Oosthuizen, who floundered to a 74 in the final round. 

Sergio Garcia (72), Collin Morikawa (69) and defending champion Justin Thomas (72) were at five under, with Patrick Reed (70) and Lee Westwood (71) one back of them. 

Olympic champion Xander Schauffele (68) was at even par and Brooks Koepka (76) at two over. 

Harris English maintained his two-shot cushion at the WGC-FedEx St. Jude Invitational leaderboard as Bryson DeChambeau climbed up the leaderboard.

Aided by three birdies during his final six holes, English carded a second successive score of 65 at TPC Southwind to sit at 18 under par.

The four-time winner on the PGA Tour endured a bogey-free round on Saturday, pulling clear in the closing stages having at one stage seen both Abraham Ancer and DeChambeau join him in top spot.

After a four at the par-five 16th, English produced an outstanding approach into the green at the next hole before rolling in a birdie putt, boosting his hopes of a wire-to-wire triumph in the tournament.

However, he is well aware that there is still plenty of work to do yet.

"There's a lot of good players behind me and my goal is just stick to my strategy and execute and whatever happens, happens," English said.

DeChambeau is not too far behind after a stunning 63 that saw him come home in just 30 shots. His seven-under score leaves him tied for second with Australian Cameron Smith, who signed for a 65.

"It was awesome being able to strike it that close to the hole all day," DeChambeau, who missed out on playing at the Tokyo Olympics due to contracting coronavirus, said.

"I didn't feel as comfortable as I would have liked with the swing, but the results were there so I was very pleased with the results. And honestly, if I can do that again tomorrow, I give myself a great chance to win."

Ancer is a further two strokes back following a three-under 67, the same score Scottie Scheffler and Ian Poulter both managed to sit just behind the Mexican on 13 under.

Dustin Johnson may still hold out hope of triumphing, with a round of 65 enough to be one of four players on 11 under par.  He is joined by Paul Casey, Will Zalatoris and Louis Oosthuizen.

Defending champion Justin Thomas already faced a battle to retain his crown, and the American was only able to shoot 69 on day three.

At seven under for the event, a repeat of his 2020 triumph appears almost impossible, considering he is so far back and the number of players ahead of him.

Harris English heads into the weekend at the WGC-FedEx St. Jude Invitational with a two-stroke lead after maintaining his spot atop the leaderboard Friday.

The American followed Thursday's 62 with a five-under-par 65 at TPC Southwind, where he won his first PGA Tour title eight years ago. 

Australia's Cameron Smith and Abraham Ancer of Mexico surged into a tie for second place after carding 62s of their own in Memphis to sit at 11 under for the tournament.

Ian Poulter (66), Scottie Scheffler (65) and Sam Burns (64) are three back of the lead at 10 under, while Louis Oosthuizen (64) and Bryson DeChambeau (66) are well within striking distance at nine under. 

English started on the back nine and made three birdies going out before carding his first and only bogey of the day at the par-four second hole. But he managed to follow that disappointment with an eagle on the third before adding one more birdie later in his round.

Smith also eagled the third on the way to tying a PGA Tour record, as he needed just 18 putts to complete his bogey-free round. 

That included a two-put at the last, not long after Smith figured out he was on the verge of history. 

"I was walking down 17 and was counting my putts up and I thought, 'No, that can't be right,'" Smith said. 

Further down the leaderboard, defending champion Justin Thomas (67) is seven strokes back of the lead at six under along with two-time major winner Dustin Johnson (65).

Phil Mickelson (66) is at five under, whie Hideki Matsuyama (69) and Patrick Reed (69) are well back at three under. 

Rory McIlroy (66), Sergio Garcia (68), and Collin Morikawa (71) are at two under, one stroke better than Brooks Koepka (69). 

Jordan Spieth (69) enters the weekend at even par and Olympic champion Xander Schauffele (73) is at two over. 

Harris English won his first PGA Tour title at TPC Southwind eight years ago, and he has another triumph in his sights after opening with a 62 at the WGC-FedEx St. Jude Invitational. 

The American has a two-stroke lead over four pursuers, as Ian Poulter, Carlos Ortiz, Jim Herman and Matthew Wolff carded six-under-par 64s Thursday in Memphis, Tennessee. 

Bryson DeChambeau, Scottie Scheffler and Marc Leishman were three shots back after shooting 65, with DeChambeau making his first start since missing the Tokyo Olympics following a positive COVID-19 test. 

Among the group two shots behind them at five under were defending champion Justin Thomas, Open Championship winner Collin Morikawa and the red-hot Louis Oosthuizen, who has top-three finishes in four of his last five starts.

Among other notables, Patrick Reed and Hideki Matsuyama are at two under, with Phil Mickelson, Dustin Johnson and Olympic champion Xander Schauffele at one under, and Brooks Kopeka and Sergio Garcia at even par.

Jordan Spieth is at one over and Rory McIlroy at two over, leaving him 62nd in the 66-player field. 

But they will all start Friday chasing English. The 32-year-old carded seven birdies on a blistering front nine, then faltered a bit with bogeys at 10 and 12 before closing his round with birdies at three of the last four holes. 

"It was one of those rounds where I was hitting it really good off the tee and making a lot of good putts," English told reporters. 

English won at Memphis in its previous incarnation as the Tour's St. Jude Classic in June 2013, then added another title that fall. 

That was his last PGA Tour win before this year, which has seen him take the Tournament of Champions in Maui in January and the Travelers Championship in June. 

Jon Rahm has been ruled out of competing at the Tokyo Olympics after testing positive for COVID-19.

The Spanish Olympic Committee announced the world number one had returned a positive result on his third PCR test after competing at The Open at Royal St George's, having previously recorded two negative outcomes ahead of his appearance at the Games.

American Bryson DeChambeau was also ruled out of competing for the same reason on Sunday, having not yet travelled to play in Japan.

For Rahm, it is the second time he has tested positive in as many months. He had to withdraw from the Memorial Tournament on the PGA Tour when leading by six shots after 54 holes.

The 26-year-old won the U.S. Open upon his return to action, securing the first major of his career by one shot thanks to a birdie-birdie finish on a dramatic Sunday at Torrey Pines.

With a shortage of time and considering the health protocols in place for the Olympics, a replacement will not be selected. Spain still has one competitor left in the field in Adri Arnaus, the world number 166.

As for DeChambeau, he admitted to being "deeply disappointed" at missing out on Tokyo.

"Representing my country means the world to me and it is was a tremendous honour to make this team," he said in a statement released by the PGA Tour.

"I wish Team USA the best of luck next week in Tokyo. I will now focus on getting healthy, and I look forward to returning to competition once I am cleared to do so."

Patrick Reed will replace him, provided he clears coronavirus tests scheduled on Sunday and Monday before departing for Japan.

Bryson DeChambeau described himself as "desperately disappointed" after a positive test for COVID-19 ruled him out of competing in the golf competition at Tokyo 2020.

A statement from the PGA Tour confirmed the 2020 US Open champion failed the final testing protocol before heading out to the Japanese capital to represent Team USA.

In his place comes Patrick Reed, who is undergoing testing on Sunday and Monday before departing for Japan.

Should he clear that hurdle Reed will become a two-time Olympian having also competed at Rio 2016. He joins Justin Thomas, Open Championship winner Collin Morikawa and Xander Schauffele as part of a star-studded USA line-up in the men's event.

"I am deeply disappointed not to be able to compete in the Olympics for Team USA," said DeChambeau.  

"Representing my country means the world to me and it is was a tremendous honour to make this team.

"I wish Team USA the best of luck next week in Tokyo. I will now focus on getting healthy, and I look forward to returning to competition once I am cleared to do so."

Reed added: "I am so excited to have the opportunity to represent our country and be a part of Team USA in Tokyo.

"I wish Bryson nothing but the best, and I know how disappointed he is to not be able to compete, and I will do my best to play my best and represent our country."

Brooks Koepka would relish a Sunday showdown with rival Bryson DeChambeau at The Open as the pair's feud continued at Royal St George's.

The American duo have been exchanging barbs for a long while now, with Koepka invited to offer an explanation when he faced the media ahead of the 149th Open in Kent on Tuesday.

Koepka revealed the issue started at the 2019 Northern Trust at Liberty National after he called out his compatriot for slow play.

A disgruntled DeChambeau took it up with Koepka's caddie, Ricky Elliott, before the pair apparently decided to call it quits, only for DeChambeau to stoke the fire with some unflattering comments about his countryman during a public online video game session.

Four-time major winner Koepka explained: "It was at Liberty. He didn't like that I had mentioned his name in slow play, so we had a conversation in the locker room, and then I guess we said something else in the press conference but didn't mention his name in it, and he walked up to Ricky and said: 'You tell your man if he's got something to say, say it to me.'

"I thought that was ironic because he went straight to Ricky. Ricky told me when I came out, I hit a few putts, and then just walked right over to him, we had a conversation.

"We both agreed we'd leave each other out of it and wouldn't mention each other, just kind of let it die off, wouldn't mention each other's names, just go about it.

"So then he decided I guess he was going on that little, whatever, playing video games online or whatever and brought my name up and said a few things, so now it's fair game."

Asked about the prospect of being paired with DeChambeau for the final round at golf's oldest major this weekend, Koepka said he would be up for the battle.

"Yeah, I would enjoy it. I would enjoy it. I'll be close to the final group come Sunday," he said.

"I always feel like I play well in the big events, the majors. I think it would be a lot more people tuning in, with everything that's gone on over the last two years, something like that, three years. So yeah, I think there would be a lot of people tuning in."

With the Ryder Cup to come at Whistling Straits in September, the two are set to be team-mates, but Koepka can handle a week of being on the same side.

"It's only a week. I mean, look, I can put it aside for business," he said.

"If we're going to be on the same team, I can deal with anybody in the world for a week. I'm not playing with him.

"I'm pretty sure we're not going to be paired together; put it that way. I think it's kind of obvious. It doesn't matter.

"We're not going to be high-fiving and having late-night conversations. I do my thing, he does his thing."

Speaking later the same day, DeChambeau was a little more succinct, saying of Koepka: "He can say whatever he wants. I think he said something back at Liberty National not upholding something. I don't know what he's talking about in that regard."

Jon Rahm birdied his final two holes to outlast Louis Oosthuizen by one stroke for U.S. Open victory and his first major title.

Oosthuizen was in a three-way share of the lead heading into the deciding round and opened up a one-shot lead on a gripping final day at Torrey Pines.

But Rahm rallied in San Diego, where the emotional Spanish star dramatically birdied the 17th and 18th holes to claim a lead he never relinquished on Sunday.

Rahm signed for a four-under-par 67 to finish six under through 72 holes as 2010 Open Championship winner Oosthuizen (71) settled for a runners-up cheque.

At the scene of his maiden PGA Tour win – the 2017 Farmers Insurance Open – Rahm became the fourth player from Spain to win a major and first at the U.S. Open.

Rahm, who was forced to withdraw from the Memorial Tournament when leading by six shots after testing positive for coronavirus earlier this month, said post-round: "I'm a big believer in karma. After what happened a couple of weeks ago, I stayed really positive, knowing big things were coming.

"I didn't know what it was going to be, but I knew we were coming to a special place, I know I got my breakthrough win here, and it's a very special place for my family. The fact my parents were able to come, I got out of COVID protocol early, I just felt like the stars were aligning.

"I can't even believe I made the first two putts! This was definitely for Seve [Ballesteros]. I know he tried a lot, and wanted to win this one most of all. I just don't know how to explain it! I don't know why, but every time we land here, we are happy. We’re in our spot!"

Oosthuizen was initially circumspect on day four, going one over through eight holes to leave the South African one shot behind defending champion Bryson DeChambeau – who came agonisingly close to a sensational hole-in-one at the par-three eighth.

But DeChambeau was unable to maintain his hot start, finishing with a forgettable six-over-par 77 to end the event eight shots off the pace.

Oosthuizen also failed to keep Rahm at bay – dropped shots at the 11th and 17th holes, paving the way for the red-hot Spanish golfer to emerge triumphant for the first time at a major.

Harris English (68) finished solo third, a stroke better off than Guido Migliozzi (68), two-time U.S. Open winner Brooks Koepka (69) and Collin Morikawa (70) as former world number one Rory McIlroy's final-round 73 resulted in a share of seventh spot at one under.

World number one Dustin Johnson (74) and fellow stars Jordan Spieth (72) Justin Thomas (73), Patrick Reed (67) and Sergio Garcia (68) closed out the event tied for 19th.