John McEnroe claims "tortured" soul Nick Kyrgios can play a big part in shaping the future of tennis, if he finds a way to manage his demons.
Wimbledon runner-up Kyrgios repeatedly lost his cool during his run at the All England Club, aiming cruel jibes at on-court officials, swearing during matches, being hostile to his own support team, and even spitting towards a spectator on one occasion.
It made it all the more remarkable that the Australian navigated a path through to the title match, albeit benefiting from a walkover in the semi-finals when Rafael Nadal pulled out with an abdominal injury.
McEnroe was no stranger to a vitriolic outburst during his playing career, earning the nickname of 'Superbrat'.
The 63-year-old is well positioned to assess the volatile Kyrgios, whose talent has never been in question but often rubs up awkwardly against his application and attitude.
Speaking on BBC Radio Five Live, McEnroe said: "I get a lot of what's going on here more than most people.
"He's a good kid, the players like him, he's well liked in the locker room, he does a lot of charity work.
"But he's got demons you know, in a way – we all have this fear of failure, and it's a question of how you best deal with it."
McEnroe said Kyrgios "moves the needle for us in tennis", suggesting the 27-year-old has skills that can move the sport in an exciting direction.
"We need this big time, but we don't need him to try half the time," McEnroe said.
The likes of Novak Djokovic, who got the better of Kyrgios in Sunday's Wimbledon final, along with Nadal, are in their mid-30s and cannot keep going forever. Roger Federer, now without an ATP ranking after a year of inactivity, is widely assumed to be close to retiring.
It remains to be seen whether Kyrgios, who has been summonsed to face a common assault charge in Australia, invests more into his tennis career in future. He appears to have an on-off love affair with the sport, being reluctant to let it dominate his life.
Of the world's top 100, only Djokovic and Nadal have played fewer ATP tournaments than Kyrgios' 12 events in the past year. Djokovic (11 tournaments) has missed some events due to his refusal to accept a COVID-19 vaccination, while injuries have limited Nadal's involvement to nine events.
McEnroe said Kyrgios "is a genius out there" on the court.
"He needs Sigmund Freud to come out of the grave and somehow figure out a way to keep this guy going for a couple of years because we could use him," said the American.
Kyrgios would likely not submit to such psychoanalysis, having been rattled by the coverage of his tantrums rivalling that of his tennis during the Wimbledon fortnight.
McEnroe added, speaking to BBC Sport: "You know he's sitting there and he's obviously tortured in certain ways. [He's] unbelievably talented, very smart."
Sinner avoids O'Connell upset at US Open
Jannik Sinner beat Australia's Christopher O'Connell in straight sets to reach the fourth round of the US Open on Saturday, avoiding a similar fate to Carlos Alcaraz and Novak Djokovic.
The men's draw at Flushing Meadows has been blown wide open by early exits for Alcaraz and Djokovic, but the top seed remains in the hunt after a composed performance.
He reached the fourth round for a fourth consecutive year with a routine 6-1 6-4 6-2 victory, setting the tone with several huge groundstrokes in the opening set.
O'Connell never looked likely to fight back as Sinner smashed 46 winners in a ruthless performance, wrapping up his win in one hour and 56 minutes.
The Australian Open champion will face either Tommy Paul or Gabriel Diallo for a place in the last eight, and he was relieved to survive an opening week full of surprises.
"Everything can happen in this sport, so I try to stay on my side of the net and I'm trying to take the tournament day by day," Sinner said in his on-court interview after the win.
"Each opponent is a very tough challenge and [I am] also enjoying every moment on the court. There have been already a couple of upsets, so let's see what's coming.
"But I'm very happy to still be here and hopefully I can play as many matches as possible. But as I said, we go day by day and then we'll see how it goes."
Data Debrief: Sinner heating up
Sinner lost his first set of the tournament to Mackenzie McDonald but has been largely untouchable since then.
He has only lost 18 games across his last nine sets of tennis, an average of two per set.
The Italian's winning streak now stands at seven straight matches, meanwhile, following his triumphant Cincinnati Open run.
US Open: Sabalenka overcomes first set scare to progress in late start
Aryna Sabalenka came from a set down to keep her US Open dream alive as she beat Ekaterina Alexandrova in the early hours at Flushing Meadows.
Sabalenka emerged on court at the Arthur Ashe Stadium at seven minutes past midnight following Novak Djokovic's shock exit from the tournament, and consecutive upsets looked to be on the cards.
However, the Belarusian responded from a disappointing opening set as she looks to avenge her defeat in the showpiece match against Coco Gauff a year ago.
The world number two set up a meeting with Belgium's Elise Mertens as she emerged a 2-6 6-1 6-2 victor in one hour and 40 minutes in New York.
"I don't know what I did, I was just trying to stay low, put as many balls as I can back on that side," Sabalenka said.
"She played incredible tennis in the first set. It was really tough to change it."
"I'm really happy I was able to turn around this match and get this really difficult win. Thanks so much for staying that late."
Data Debrief: Sabalenka survives late, late show
Sabalenka's encounter with Alexandrova was the latest starting match at the US Open, beating Gabriela Sabatini and Beverley Bowes' meeting in 1987 that started at midnight.
The Belarusian, however, will be hoping for a much improved performance in the next round, having produced 27 unforced errors throughout the contest and serving four double faults.
US Open: Djokovic played 'worst tennis ever' in Popyrin loss
Defending US Open champion Novak Djokovic suffered a shock exit at Flushing Meadows as he lost in four sets to Alexei Popyrin.
Djokovic arrived at the tournament with confidence following his gold medal triumph at the Paris Olympics, and was tipped to lift a record-extending 25th grand slam title.
However, the Serbian's hopes of a fifth success in New York were dashed as he followed fellow favourite Carlos Alcaraz out of the competition in the third round.
Popyrin emerged victorious in three hours and 18 minutes, prevailing 6-4 6-4 2-6 6-4 to confirm Djokovic's earliest exit from the tournament in 18 years.
"I have played some of the worst tennis I have ever played," Djokovic said.
"Honestly, the way I felt and the way I played from the beginning of this tournament, third round is a success."
"I tried my best, I didn't have any physical issues. I just felt out of gas, and you could see that. From the first match, I just didn't find myself on this court.
"Life moves on. I'll try to recalibrate and look forward to what's next."
Data Debrief: Another one bites the dust
Djokovic was far from his clinical best, serving a career-high 14 double faults in a grand slam match and committing 49 unforced errors.
The Serbian will also end the year without winning a grand slam title, the first time he has done so since 2017.
But the day belonged to Popyrin, saving 12 of the 16 break points he faced against the world number two, finding particular success with his forehand as 31 of his 49 winners came from that shot.
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