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."
Djokovic withdraws from ATP Finals
Novak Djokovic has pulled out of the ATP Finals, which start in Turin later this week.
Djokovic pulled out of the Paris Masters last month, and the world number five will now not feature in the season-ending tournament.
The 37-year-old, who lost to Jannik Sinner in the Shanghai Masters in his last competitive appearance, is sat on 99 ATP Tour-level titles, and his wait for a 100th victory will now roll into 2025.
Djokovic confirmed on Tuesday that he would not be participating in the ATP Finals.
"I was really looking forward to being there, but due to ongoing injury I won't be playing next week," Djokovic said on social media.
"Apologies to those who were planning to see me. Wishing all the players a great tournament. See you soon!"
Jannik Sinner, Alexander Zverev, Carlos Alcaraz, Daniil Medvedev and Taylor Fritz have all qualified for the tournament.
Andrey Rublev, Casper Ruud and Alex de Minaur are the three players contesting for the remaining two spots.
WTA Finals: Sabalenka digs deep to reach semi-finals
Aryna Sabalenka became the first player to book her place in the WTA Finals semi-finals after her straight-sets win over Jasmine Paolini on Monday.
The Belarusian had to dig deep in the second set but prevailed in 91 minutes, beating the Italian 6-3 7-5 in Riyadh to secure top spot in the Purple Group after two games.
While Sabalenka cruised through the first set, she was almost forced to a decider, but saved two set points in the 10th game of the second to level the score at 5-5 before going on to claim the victory.
In doing so, she became the first player to reach back-to-back semi-finals at the tournament as world number one since Serena Williams in 2013-14.
Having won three of her previous four tournaments and won 22 of her 23 matches in that time, Sabalenka is now just one win away from securing the year-end world number one spot for the first time, a feat she can achieve if she beats Elena Rybakina on Wednesday in the final round-robin match.
And she can go into it with confidence after improving her record against top-five opponents in 2024, with this her fifth such triumph.
"I'm proud of myself. Not only myself, my team," Sabalenka said.
"We were able to overcome a lot of things. To be able to show such great tennis and become World No. 1. It's teamwork. It's not only me. The behind-the-scenes work nobody sees.
"But they do a lot for me. I really appreciate them for everything they do for me. This is motivation for me to keep winning on this court. Those guys deserve to be called the best team ever."
In Monday's other match, Zheng Qinwen kept her hopes of reaching the final four alive with her win over Rybakina.
The Olympic champion was forced to go the distance though, despite getting the first break in the first and second sets, but eventually came out on top 7-6 (7-4) 3-6 6-1 in just under two-and-a-half hours.
Since the event's inauguration in 1972, Zheng is just the second Chinese player to win a match at the WTA Finals after Li Na.
It was a milestone victory for the 22-year-old as well as she earned her 50th win of 2024, improving her record to 50-17, making her the first Chinese player in the Open Era to hit that mark in a calendar year, though she acknowledged she could have made things easier for herself.
"I was the one to make the first break, and then I let her back in the first," Zheng said.
"Then it happened again in the second. But in the third set, I talked to myself. I broke her first and I stayed focused.
"Finally, in the third set, I start to play my tennis again. So, I'm really happy to win the match."
WTA Finals: Swiatek battles from the brink to make winning start
Iga Swiatek began her bid to regain the world number one ranking by recovering from a set and double break down to beat Barbora Krejcikova in her first match at the WTA Finals.
Swiatek, playing in her first competitive game since her US Open quarter-final exit, emerged a 4-6 7-5 6-2 victor against the Wimbledon champion in Riyadh.
The Pole is the third player in the last 30 years to achieve three or more seasons in a row with over 60 wins, after Martina Hingis (1997-2001) and Caroline Wozniacki (2009-2011).
Only Elina Svitolina (12) has played fewer matches at the WTA Finals than Swiatek (13) to achieve 10 wins at this event since the reintroduction of the Round Robin format in 2003.
But the Pole acknowledged the difficulties she faced against Krejcikova, saying she must improve if she is to retain her WTA Finals crown.
“Even though I played a lot of those [practice] matches,” Swiatek said afterward. “I kind of forgot for a while how it is to feel all those things, a bit different stress and emotions.
"For sure, I needed some time to adapt. The most important thing was that even though it happened, I managed to fight through that. And was patient enough to wait to get better.”
In Sunday's other match, Coco Gauff beat fellow American and doubles partner Jessica Pegula 6-3 6-2 in the second Orange Group match.
Gauff moved to a win-loss record of 51-16 in 2024, including the Olympics and team events, equalling her career-high from 2023 for WTA-level match wins in a calendar year.
She is now only the fifth player to claim 20 or more WTA top 10 wins before turning 21, along with Kim Clijsters (45), Maria Sharapova (39), Ana Ivanovic (26) and Wozniacki (23) since 2000.
"I think maybe I served better than previous times and this is our first time, I think, playing each other on indoor hard, so maybe that had something to do with it," Gauff said.
"I don't know. I think I know I've lost to her a lot, but it doesn't feel like it sometimes.
"Because we do practice a lot, and obviously, when we're playing sometimes I win practice sets, sometimes she does. So it doesn't feel like the head to head is as bad as it was."
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