Pablo Carreno Busta believes it is too early to assume Carlos Alcaraz and Jannik Sinner will “reign for the next 20 years” as Roger Federer, Rafael Nadal and Novak Djokovic did. 

The former world No 10 declared he does not think the future will belong only to Alcaraz and Sinner and argued other players will “make things difficult for them.”

Alcaraz and Sinner are the two leading stars of their generation and they have split the four Grand Slam titles between them this year.

Sinner won his maiden major at the 2024 Australian Open before adding the US Open crown, while Alcaraz secured the French Open and Wimbledon titles to take his Grand Slam tally to four.

The duo are the only ATP players born after 1996 to win a Grand Slam title, with 2021 US Open winner Daniil Medvedev, who is 28, is the next-youngest major champion in men’s tennis.

Some analysts expect Alcaraz and Sinner, who are 21 and 23 respectively, to form a ‘Big Two’ in men’s tennis and dominate the sport in a similar way to that of the ‘Big Three’ of Federer, Nadal and Djokovic.

In an interview with Punto de Break, Carreno Busta argued it is premature to suggest Alcaraz and Sinner will be unstoppable forces for the next two decades.

“They are still very young, both Sinner and Carlos,” said the Spaniard. “It is clear that they are very good, but we already assume that they will reign for the next 20 years as Roger, Rafa and Novak did.

“Many things can happen, it is not easy to maintain the level of demand for so long, or the level of success to share the four Grand Slams, as has happened this year.

“New people can also come, another very good player can appear who is four years younger than Carlos, for example.

“I do not think that the future belongs only to these two players, others will come who will make things difficult for them, but it does look like these two are going to be there for many years.”

Carreno Busta, who missed large periods of the last two years due to injury, also spoke about what changed on the ATP Tour during his absence.

“Sinner has improved a lot, Carlos has consolidated himself, Novak finds it a bit more difficult to win… but I have noticed the big difference in the rest of the players, especially in the top 20 and below,” he assessed.

“Players who were good when I left, but were in the top 60 and top 80; now they are already in the top 30.

“Arthur Fils, Alexei Popyrin, Jordan Thompson. I need to play against these players again to see where they are, because they are not where I had left them (laughs).”