Greg Rusedski believes Carlos Alcaraz has shown similar promise as Rafael Nadal did from an early age, but it's too soon to make any predictions.
Alcaraz will face compatriot Nadal for the first time this week as they meet in the second round of the Madrid Masters on what will be his 18th birthday.
It is a highly anticipated contest, particularly in Spain, where Alcaraz has long been hailed as the heir to Nadal's crown.
Top Amazon Prime analyst and former US Open champion Rusedski has been keeping a close eye on Alcaraz's rise, and whilst he sees certain parallels, he believes no one should be rushing to make big predictions.
Asked on Amazon Prime's coverage if it was too early to talk about Alcaraz winning Grand Slams, Rusedski said: “Definitely, no question about that. You can’t even talk about Slams now.
“He’s got to win a title first at 250 level, then 500, then 1000 – which is a difficult task to do in this generation.
“So let’s not get ahead of ourselves, we’ve had a lot of hype. The only kid I’ve seen that was that good at 15 years of age was Rafael Nadal.
“If you would have said to me when I saw him at 15: ‘would he win multiple Slams?’, [I would have said] yes.
"With this youngster Alcaraz, [I'm] not sure yet. That’s still a big step to take.”
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