Tommy Haas says Carlos Alcaraz is already primed to succeed Novak Djokovic and Rafael Nadal at the very top of tennis.
Alcaraz became the youngest men's world number one when he won his maiden grand slam title at the US Open last year.
The Spaniard missed this year's Australian Open due to an injury, allowing Djokovic to reclaim his place at the summit of the rankings with his 10th triumph in Melbourne.
Djokovic celebrated a record-breaking 378th week at number one on Monday, the day after Alcaraz had fallen short against Cameron Norrie in the Rio Open final.
Alcaraz, who has already won seven singles titles, battled through pain in Brazil but ultimately slipped to a 5-7 6-4 7-5 defeat against the opponent he beat in the Argentina Open final a week earlier.
With the 19-year-old having already reached 10 tour-level finals, though, former world number two Haas has no doubt Alcaraz is in line to enjoy success close to that of Djokovic and Nadal.
"Yes, you have to say that he already is [ready]," Haas told Stats Perform.
"He had an unbelievable year last year, right. I think he won a title down there in Rio, on clay then he came to Indian Wells playing extremely good tennis, losing a tough battle match against Rafa in the quarters.
"They played some incredible tennis and you could just tell the way he moves on the court, his mental toughness and the shot selection that he has, the repertoire there is, there's nothing really missing.
"Being that young sometimes can be like the only hindrance in my mind because maybe you want it too much, or you overthink things. Or maybe in this case, you clearly don't overthink things, and you just go out and play your best and fight and give it everything you have.
"A lot of respect obviously goes to his team, his family, his coach. He just kind of went on that run, winning [in] Madrid, in his home country. And then winning his first slam, the US Open and being the youngest world number one, so what a quick rise. Just unreal, I can't even imagine how his life has been turned upside down in many ways."
The only concern, as far as Haas sees it, is Alcaraz's injury worries.
"He's a guy that wants to stick around, and remain up there at the top for a very, very long time," Haas added.
"With his game, and his potential, if he stays healthy... that's the thing, he's been already a little bit injured at a young age. So, that's a little bit of a warning sign.
"If he can remain healthy, I think that's where the team is obviously very smart. I think they're trying to build up his body still, to sustain the crazy amount of travel and the stress on the body that tennis creates on you to make sure that he has a long career, because that's what everybody hopes and dreams for."
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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