Carlos Alcaraz and Novak Djokovic are clearly ahead of the rest of the men's singles field, but Marion Bartoli believes both can be caught.
Alcaraz denied Djokovic a fifth straight Wimbledon title last weekend with a stunning five-set victory at SW19, to secure the 20-year-old Spaniard a second grand slam title.
As a pair, Alcaraz and Djokovic have now won the last five grand slams stretching back to last year's Wimbledon, and Bartoli feels they are far ahead of the chasing pack.
The former Wimbledon champion however suggests that gap could motivate others to work on their own game in order to catch up.
"Very much, when you look at the first three grand slams [of 2023], it's clear that there is Novak, Carlos and the rest and there is quite a gap between those two and the rest," she told Stats Perform.
"That's quite obvious with the results. That said, I think that's going to push them to sort of catch back just like Novak did with Roger [Federer] and Rafa [Nadal].
"With [them] having more Grand Slams than him and wanting to be part of the conversation, that just pushed him to elevate his level.
"I think it's going to be the case on the ATP. I don't think the guys are going to look at Carlos and Novak saying 'Oh my god, they're just untouchable, and we're going to lose to them'.
"I think they're going to really try hard. Especially I can see [Holger] Rune, I can see [Stefanos] Tsitsipas, I can see [Daniil] Medvedev, all those and [Jannik] Sinner, being very eager and very hungry to just go and chase.
"I'm sure they can actually push them to work harder on their game to come up with something even better. So I don't see it as a runaway completely and there is no opposition.
"I think maybe it's going to take a little bit of time before they reach that level, but I just don't think it's going to be that easy in a way for Novak and Carlos to just win everything without having a say from the other players."
Bartoli, who won at SW19 in 2013 before retiring in 2018, believes Alcaraz has taken the best qualities of the 'Big Three' of Djokovic, Nadal and Federer and feels he is one of those spearheading a new era in tennis.
"In the eras before, when you look at Pete Sampras, and all those players, it was one way to play and then if you would take that play away it was a lot more difficult for them," she explained.
"If you take Alcaraz for me, what is very interesting is he has almost the best of Novak, Roger and Rafa combined and that is new. I think it's very much sort of total tennis, when you feel there is just not one department that maybe is lacking a little bit.
"There is a lot of players from this or sort of the past generation that are not that complete, who are really going to suffer against those new kids like Alcaraz, Rune and Sinner who are coming in and just having nothing you feel that they could really do better.
"In that sense, I think that's going to be the new sort of tennis we will see for the next 10 to 20 years."
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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