Phil Mickelson has expressed his "deepest of sympathy and empathy" for the families of the 9/11 victims amid continued criticism over his decision to join the LIV Golf Invitational Series.

The controversial eight-event Saudi-backed breakaway circuit, which got under way in London last week, has a prize fund of $250million that is bankrolled by Saudi Arabia's Public Investment Fund (PIF).

Mickelson and the other American players taking part in the series have been accused by a group representing victims' families and survivors of "sportswashing" – the practice of using sport to improve a tarnished reputation.

Terry Strada, the chair of the 9/11 Families United, said in a statement: "Whether it was the appeal of millions of dollars of hard cash, or just the opportunity to prosecute your professional grievances with the PGA, you have sold us out.

"This is a betrayal not only of us, but of all your countrymen."

Strada cited Saudi Arabia's prominent role in the terror attack 21 years ago, with Osama bin Laden and 15 of the 19 hijackers being Saudi nationals.

In another uncomfortable news conference on Monday ahead of this week's U.S. Open in Massachusetts, Mickelson was asked directly about Strada's comments.

"I would say to the Strada family, I would say to everyone that has lost loved ones, lost friends on 9/11 that I have deep, deep empathy for them. I can't emphasise that enough," he said.

"I have the deepest of sympathy and empathy for them."

Asked if he intended to respond privately to the letter, Mickelson repeated his earlier answer.

Mickelson and the others to have joined up for the series have also faced criticism from their colleagues, with Rory McIlroy – the winner of last week's Canadian Open – among the more vocal of those to speak out against the LIV Series.

"I certainly respect Rory," Mickelson said. "I thought what a great finish on Sunday and a great accomplishment. What a career he has had. I certainly respect him. I respect his ideas. I respect all the players that choose to stay on the PGA Tour.

"I certainly think extremely highly of many of the players on the PGA Tour and their right to their own decisions.

"I gave as much back to the PGA Tour and the game of golf that I could throughout my 30 years here, and through my accomplishments on the course I've earned a lifetime membership. I intend to keep that and then choose going forward which events to play and not."

Justin Thomas called it "sad" that LIV Golf continues to dominate the headlines in the lead-up to the U.S. Open.

LIV Golf's first event took place this past weekend, with South Africa's Charl Schwartzel pocketing $4.75million as the inaugural winner.

Made possible through Saudi Arabia's Public Investment Fund, the upstart tour has thrown exorbitant sums of money at PGA Tour players to poach them away, including Bryson DeChambeau and Dustin Johnson.

Speaking to the media after opting to not play in Monday's U.S. Open practice round, Thomas said the ubiquitous LIV Golf discussion during one of the great weeks on the golfing calendar was "sad".

"I grew up my entire life wanting to play the PGA Tour," he said. "Wanting to break records, make history, play Presidents Cups, play Ryder Cups.

"The fact that things like that could potentially get hurt because of some of the people that are leaving, and if more go, it's just sad. 

"It's really no other way to say it. It just makes me sad, because like I said, I've grown up my entire life wanting to do that, and I don't want to do anything else.

"The people that have gone, like I said, they have the decision that they're entitled to make. Not necessarily that I agree with it one way or the other, but everything has got a price, I guess."

He later added: "You can't go anywhere without somebody bringing it up.

"It's sad. This is the U.S. Open, and this is an unbelievable venue, a place with so much history, an unbelievable field, so many storylines, and yet that seems to be what all the questions are about.

"That's unfortunate. That's not right to the USGA. That's not right for the U.S. Open. That's not right for us players. But that's, unfortunately, where we're at right now."

Thomas was not done there, going on to discuss why he does not think the money is worth it, but also why it is not fair to make character assessments on the players who decided to make the move.

"There's no amount of money that you could get that [can make you happy doing something] you don't love or enjoy," he said. 

"You're still going to be miserable. You're still not going to enjoy it. Although you might be miserable in a bigger house or a nicer car, that doesn't necessarily mean that your life is going to be any better.

He added: "I'm the first to admit that there's times where people do something, and I bash them – obviously not externally – maybe internally with friends or whatever it is. It's not necessary.

"You can disagree with the decision. You can maybe wish that they did something differently… being in the media as a writer, you have to write about it. I understand that. 

"But for people at home to necessarily say that Dustin Johnson is now a bad person, that's not fair. That's just not right.

"Now, again, I said it last week, I'll say it again, do I wish he wouldn't have done it, and am I a little sad about it? Yeah – but it is what it is."

PGA Tour commissioner Jay Monahan described the LIV Golf Invitational as a "series of exhibition matches" while defending his decision to suspend players who defected to the breakaway series.

Charl Schwartzel, who won the inaugural LIV event near London this weekend, has been suspended from the PGA Tour along with the likes of Dustin Johnson, Phil Mickelson and Sergio Garcia for their involvement in the series.

The LIV series is set to hold eight 54-hole, no-cut tournaments with 48-man fields this year, with players not only earning significantly higher prize money, but taking substantial sign-on fees. Bryson DeChambeau and Patrick Reed have been the latest to defect.

Asked why golfers cannot compete on both tours, Monahan took an assertive stance.

"Why do they need us so badly? Those players have chosen to sign multi-year, lucrative contracts to play in a series of exhibition matches against the same players over and over again," he said on CBS' broadcast of the Canadian Open.

"You look at that versus what we see here today, and that's why they need us so badly.

"You've got true, pure competition, the best players in the world here at the RBC Canadian Open, with millions of fans watching. And in this game, it's true and pure competition that creates the profiles and presences of the world's greatest players."

Monahan was particularly critical of LIV's source of investment, with the Public Investment Fund in Saudi Arabia which has been accused of sports washing and using the tour to take attention away from a history of human rights abuses.

He also said players who defected would "have to be living under a rock" to not consider that context, but chose instead to relate the significant outlay to sign players and hold events to the potential return on investment.

"It’s not an issue for me, because I don’t work for the Saudi Arabian government," Monahan said. "But it probably is an issue for players who chose to go and take that money. I think you have to ask yourself the question, why?

"Why is this group spending so much money — billions of dollars — recruiting players and chasing a concept with no possibility of a return? At the same time, there’s been a lot of questions, a lot of comments, about the growth of the game. And I ask, how is this good for the game?

"I would ask any player that has left, or any player that would consider leaving, have you ever had to apologise for being a member of the PGA Tour?"

Rory McIlroy saved his best for last to defend his Canadian Open title on Sunday and could not resist a sly dig at LIV Golf chief executive Greg Norman afterwards.

At the end of a chaotic week for the sport, with the controversial Saudi-backed LIV Golf Invitational Series commencing in competition with the PGA Tour, McIlroy posted his best round of the tournament at St. George's with an eight-under 62.

Playing in the final group with Tony Finau and Justin Thomas, the 33-year-old finished on 19-under for the tournament in front of a packed gallery and secured his 21st PGA Tour win, moving him ahead of Norman's 20.

Though evidently happy he secured the win heading into the U.S. Open, as one of the more vocal critics of LIV Golf, the world number eight made sure everyone knew he was aware he had overtaken Norman.

"Twenty-first PGA Tour win. One more than someone else," he told CBS. "That gave me a little bit of extra incentive today. Happy to get it done.

"It's incredible. Playing with Tony [Finau] and JT [Thomas], two of the top players in the world, and all of us playing the way we did, the worst score in the group was six-under par.

"This is a day I'll remember for a long, long time. I've sort of rededicated myself to the game a little bit, sort of realised what made me happy and this makes me happy."

McIlroy led the entire way on Sunday, starting the final round in a share of the lead with Finau.

He started fast, too, making five birdies on the front nine before commencing the back nine with another three on the bounce.

Bogeys on the 13th and 16th holes opened the door for Thomas and Finau but it was promptly shut, with the Northern Irishman closing out the round with another pair of birdies.

Finau and Thomas finished outright second and third on 17- and 15-under respectively, while Justin Rose tied Sam Burns on 14-under after bogeying the 18th to just miss out on a spectacular sub-60 score.

Tony Finau birdied the final hole for an eight-under 62 on Saturday to share the lead with Rory McIlroy, coming into the final round of the Canadian Open.

Finau had the best round of the tournament so far, scoring an eagle on the par-five ninth before making four birdies on the back nine.

The 32-year-old is looking for only his third PGA Tour victory, with his last win coming in a playoff over Cameron Smith in last year's Northern Trust.

McIlroy had a tricky uphill putt to also birdie on the 18th hole, despite an exceptional approach to set it up, but he had to ultimately two-putt to finish the round after his birdie attempt skimmed over the edge of the cup.

The 33-year-old has been in confident touch at St. George's this week and continued that on Saturday, posting a five-under 65 with assertive driving and wedge-play.

After a bogey on the par-three eighth, the Northern Irishman responded with three birdies over the next four holes, before managing another birdie on the par-five 15th.

The final hole would have been an apt punctuation mark for his third round, after scores of 66 and 68 over the opening two days.

McIlroy has had to wait three years to defend his 2019 title, with the Covid-19 pandemic forcing a cancellation of the tournament in 2020 and 2021.

He is among five players ranked in the world's top ten in a high-profile field at Toronto, coming into next weekend's U.S. Open, with Justin Thomas and Sam Burns joined by Wyndham Clark and Alex Smalley on nine-under.

Cameron Smith has recovered from an opening-round six-over 76 to finish on one-under after 54 holes, posting a 68 on Saturday, while world number one Scottie Scheffler scored a disappointing 71.

Patrick Reed has joined the LIV Golf Invitational Series and become the latest high-profile name to turn their back on the PGA Tour. 

It was confirmed on Saturday that the 2018 Masters champion had signed up for the Saudi Arabia-backed circuit, which was this week joined by Bryson DeChambeau and had Phil Mickelson and Dustin Johnson contesting its inaugural event this weekend. 

Reed is set to make his first appearance when the series travels to Portland for the second of its eight events later this month. 

LIV Golf CEO and commissioner Greg Norman said: "The growing roster of LIV Golf players gets even stronger today with a player of Patrick Reed's calibre. 

"He has a proven track record as one of the most consistent competitors in pro golf and adds yet another big presence at our tournaments. 

"He's a major champion who has had a significant impact playing international team competitions, and he'll bring another impressive dynamic to our team-based format at LIV Golf." 

Reed has slipped to 36th in the world rankings having only made his first top-10 finish of 2022 at the Charles Schwab Challenge in May. 

He will now be ineligible for any tournaments on the PGA Tour after it was this week confirmed all players competing at any LIV Golf events would be indefinitely suspended. 

However, Rickie Fowler and Bubba Watson are among another group of players reportedly set to make the switch to LIV Golf, which now boasts a field that includes nine major champions. 

Wyndham Clark was able to hold onto his outright lead at the Canadian Open with an even par second round on Friday, one stroke ahead of Rory McIlroy and the chasing field.

Clark remains at seven under after a spectacular 63 on Thursday, posting three birdies and three bogeys on his second trip around the course.

McIlroy headlines the five-man group at six under, along with American trio Keith Mitchell, Jim Knous and Alex Smalley, as well as England's Matt Fitzpatrick, who closed his round with three consecutive bogeys to surrender the lead.

Alone at five under in outright seventh is Austin Cook, who posted Friday's round of the day with his six-under 64, going bogey-free with six birdies to vault himself into contention after entering play at one over.

Scottie Scheffler and Sam Burns are in a logjam at four under, as is Shane Lowry, while Tony Finau and Harold Varner III are one further back at three under, rounding out the top-20.

Justin Thomas shot his second consecutive 69 to head into the weekend at two under, while English trio Danny Willett, Justin Rose and Aaron Rai sit at one under.

The second-best score of the round belonged to Cameron Smith, who shot a 65 to land right on the cut-line after a calamitous 76 in his opener.

Rory Sabbatini and Stuart McDonald missed the cut by one stroke, while Camilo Villegas was a further shot back after going five over on his last four holes.

Bryson DeChambeau has become the latest high-profile player to shun the PGA Tour and join the Saudi-backed LIV Golf Invitational Series.

The 2020 US Open winner, who has eight PGA Tour titles to his name in total, joins the likes of Phil Mickelson and Dustin Johnson in switching to the rival circuit.

DeChambeau's involvement was made official on Friday by LIV Golf, which launched with its first event on the outskirts of London on Thursday.

His first appearance will be in the second of the eight-series event in Portland later this month.

LIV Golf chief executive Greg Norman said in a statement: "Bryson DeChambeau is an exciting addition to LIV Golf's supercharged style of play. 

"He is passionate about the sport, innovative in his approach and committed to pushing the boundaries in pursuit of excellence.

"He's not afraid to think outside the box and supports our mission of doing things differently to grow our game.

"The power and energy he brings to the course will deliver added electricity to our competition in Portland and beyond."

DeChambeau is currently 28th in the world rankings after slipping out of the top 10, where he had spent most of the past two years, due to a niggling injury issue.

The American missed the cut at last week's Memorial Tournament and will now be blocked from competing in any further PGA Tour events, likely including next week's U.S. Open.

That comes after the Tour confirmed on Thursday that all players competing in the opening event this week, and any who play in future events, are indefinitely suspended.

DeChambeau is the eighth major champion to defect to LIV Golf, along with Sergio Garcia, Johnson, Mickelson, Martin Kaymer, Graeme McDowell, Louis Oosthuizen and Charl Schwartzel.

Wyndham Clark leads the Canadian Open after the first round of play, shooting a seven-under 63 in Toronto on Thursday.

Amid an awkward atmosphere around the course with LIV Golf's commencement outside London on Thursday and suspension for players part of the rebel tour, Clark was able to hold his lead against the afternoon wave of players.

After securing a berth at next weekend's U.S. Open in a qualifier on Monday, the 28-year-old carried some confidence into the opening day at St. George's Golf and Country Club, starting with five birdies on the opening nine.

He went bogey-free on the closing nine holes, scoring birdies on the par-four fourth and seventh holes.

Ian Poulter and Graeme McDowell have hit out at the PGA Tour for their handling of players who have decided to participate in LIV Golf, calling it a "power struggle".

The PGA Tour made the bold move of waiting until after the first LIV Golf event in London had teed off before announcing that any player who participates in the Saudi-backed promotion is "suspended or otherwise no longer eligible to participate in PGA Tour tournament play, including the President's Cup."

In the first round of LIV Golf's debut event, Charl Schwartzel earned the outright lead at five under, trailed by Hennie Du Plessis at four under, while Dustin Johnson and Phil Mickelson were also among the 10 players to finish under par.

Speaking after the round, Poulter strongly disagreed with the PGA Tour's decision to force players to choose between the tours.

"I've played a lot of tournaments all around the world, this event is no different," he said. "It's a shame if they view this as something different.

"I will appeal for sure. It makes no sense. Having two tour cards and the ability to play golf all over the world, what's wrong with that? I believe I've been given permission in the past to play in events around the world.

"I don't know why [the decision was made] – we can all make assumptions as to why. Competition is probably the real reason. It's a power struggle, and it's just disappointing."

Fellow U.K. golfer McDowell echoed Poulter's sentiments, saying it is ridiculous that they are not allowed to compete in events relatively local to them.

"Some guys believe that they shouldn't be in the situation where they have to resign," he said. "They don't feel like they are doing anything wrong. 

"We haven't been issued releases, [but] we feel like we should have been issued releases. We've done it for the last 20 years, operated all over the world.

"We're in the U.K – you've players like myself and Ian Poulter and Lee Westwood, we are in our home markets here.

"We should be allowed to operate here as professional golfers. But hey, we all know the situation is about something bigger.

"It's competition and it's not liked. They are having to play the game the way they feel they have to play it, which is playing hard ball.

"We feel confident that we are well-protected and we are going to just try and do our best."

Rory McIlroy and Justin Thomas have supported the PGA Tour's decision to suspend all players competing in the LIV Golf Invitational Series.

PGA Tour commissioner Jay Monahan sent a memo to all members on Thursday confirming the news, shortly after LIV Golf's first event had launched at Centurion Club near London.

All 17 Tour members competing in the first Saudi-backed tournament of the breakaway series, including six-time major winner Phil Mickelson, were informed they are no longer eligible to play in events on the circuit.

The memo warned that any player featuring in future LIV events will face a similar punishment.

McIlroy said on Wednesday he understands why some have made the switch due to the huge sums of money on offer, but the Northern Irishman is pleased with the decision to block players from competing on both circuits.

"I think at this point, Jay [Monahan] has been pretty transparent in terms of he's just going to act within the tournament regulations and the rules that are set for a PGA Tour member," McIlroy said.

"All he's doing is basically going by the book. I think that the majority of the membership that are here this week and that haven't gone and played elsewhere really appreciate that.

"So, I think he's done the right thing because these guys have broken rules and done things outside of the tournament regulations, and because of that, there are going to be consequences, I guess."

McIlroy was speaking after carding an opening-round 66 at the RBC Canadian Open on Thursday, with Thomas three shots further back.

While the four-time major winner is against the idea of the breakaway series, he will be tuning in out of curiosity.

"I think like everyone else, I'm intrigued and I'm a fan of golf," McIlroy said. "I've got quite a few guys over there that I call friends that are playing. 

"Yeah, of course I'll see it and watch it and see what all the fuss is about."

Mickelson is the highest-profile casualty of Thursday's announcement, with Dustin Johnson and Sergio Garcia having already notified the Tour that they have resigned their membership.

Louis Oosthuizen, Lee Westwood and Ian Poulter are among the other notable names featuring at the three-day LIV Golf Invitational London event that will have 12 teams and 48 players.

Echoing the comments made by McIlroy, Thomas said: "I'm pleased. I think anybody that's shocked clearly hasn't been listening to the message that Jay and everybody's been putting out. They took that risk going into it, whether they thought it was a risk or not.

"Like I've said the whole time, I have great belief and great confidence in the PGA Tour and where we're going and continuing to grow to, and those guys just aren't going to be a part of it.

"[LIV Golf] are obviously throwing so much money at people that it's very hard to turn down. I don't care what you say in terms of that people play for different reasons. It doesn't matter who you are or what it is, everything has a number.

"They're reaching that number for some people, and I hope that they don't get others. But I think a very strong core group of us is very stable and firm in our position, and I hope that it stays that way."

Bryson DeChambeau will be the next superstar to sign up to the LIV Golf Invitational Series, his agent has confirmed.

Brett Falkoff confirmed DeChambeau's involvement on a rollercoaster first day for LIV Golf, which launched with the first round of its first event in London on Thursday.

Reports had revealed DeChambeau and Patrick Reed would be joining the controversial breakaway league.

There was still no announcement from LIV Golf, but Falkoff said in a statement reported by GolfChannel.com: "Bryson has always been an innovator.

"Having the opportunity to get in on the ground floor of something unique has always been intriguing to him. Professional golf as we know it is changing and it's happening quickly."

DeChambeau does not intend to resign from the PGA Tour, the same website reported, although he may have no choice in the matter.

The Tour suspended all players involved in the LIV Golf Invitational London, including the returning Phil Mickelson.

During Thursday's first round, LIV Golf responded in a statement, saying: "Today's announcement by the PGA Tour is vindictive and it deeps the divide between the Tour and its members.

"It's troubling that the Tour, an organisation dedicated to creating opportunities for golfers to play the game, is the entity blocking golfers from playing.

"This certainly is not the last word on this topic.

"The era of free agency is beginning as we are proud to have a full field of players joining us in London, and beyond."

The PGA Tour has suspended the 17 members who are playing in the first event of the controversial LIV Golf Invitational Series.

The news was confirmed in a memo signed by Tour commissioner Jay Monahan on Thursday.

Phil Mickelson, Dustin Johnson and Sergio Garcia are among the players to have been suspended, though the latter two are among those who have notified the Tour of that they have resigned their membership.

Louis Oosthuizen, Lee Westwood and Ian Poulter are also among the other notable names featuring at the three-day event that will have 12 teams and 48 players

Graeme McDowell, Kevin Na, Charl Schwartzel, Hudson Swafford, Talor Gooch, Branden Grace, Matt Jones, Andy Ogletree, Peter Uihlein and Turk Pettit are the others included in the memo.

Monahan confirmed the decision to prohibit those players from playing on all features of the PGA Tour, including the Korn Ferry Tour, PGA Tour Champions, PGA Tour Canada and PGA Tour Latinoamerica.

The breakaway golfers will also be removed from the FedEx Cup rankings following this week's RBC Canadian Open and will not be eligible for the FedEx Cup or Presidents Cup.

"These players have made their choice for their own financial-based reasons. But they can't demand the same PGA Tour membership benefits, considerations, opportunities and platforms as you," the memo read. 

"That expectation disrespects you, our fans and our partners."

Garcia, Westwood and Johnson were among 10 players to resign from the Tour to pursue their LIV Golf interests, but Monahan added they will not be granted sponsor exemptions to play in tournaments as non-members.

Bryson DeChambeau and Patrick Reed have been widely reported to have signed up to the lucrative series, though neither are playing this weekend.

Monahan said any players who do take part in future LIV events will face the same consequences.

The decision comes amid the widespread backlash against the controversial, Saudi Arabia-backed breakaway, with many accusing the event of sportswashing.

Greg Norman, a two-time Open champion and LIV Golf's CEO, suggested Saudi Arabia is "making a cultural change".

Mickelson found himself at the centre of the controversy last year when admitting to being aware of Saudi Arabia's human-rights record but signed up to LIV Golf anyway because "this is a once-in-a-lifetime opportunity to reshape how the PGA Tour operates".

On the eve of the first tournament, Mickelson received a grilling from the media, and he told reporters: "I don't condone human rights violations, I don't know how I can be any more clear.

"I understand your question but again I love this game of golf, I've seen the good it's done and I see the opportunity for LIV Golf to do a lot of good for the game over the world and I'm excited to be a part of this opportunity."

World number 17 Johnson is the highest-ranked player on the current LIV Golf list and acknowledged he did not initially know the repercussions of his decision, but said he had chosen "what's best for me and my family".

The PGA Tour has suspended the 17 members who are playing in the first event of the controversial LIV Golf Invitational Series.

The news was confirmed in a memo signed by Tour commissioner Jay Monahan on Thursday.

Phil Mickelson, Dustin Johnson and Sergio Garcia are among the players to have been suspended, though the latter two are among those who have notified the Tour of that they have resigned their membership.