Lleyton Hewitt has told Nick Kyrgios that there is still time to fulfil his promise, but he needs to look to the example set by Alexander Zverev to do it.
Kyrgios has been plagued by disciplinary and misconduct issues throughout his career, and has completely stagnated in the rankings.
Zverev, meanwhile, has just had a breakthrough win at the ATP Finals and looks set for a big year in 2019.
Hewitt, though, believes Kygrios can still rival the German given the right application.
“There’s still time, absolutely – but it goes quickly,” Hewitt told the Australian Associated Press.
“It goes quickly and you get the next group of kids coming up as well and they’ll be challenging next and they’ll see Zverev now is on the plate.
“Two years ago, Nick was probably ahead of Zverev in terms of what a lot of people thought his potential was.
“Zverev’s done absolutely everything right. He is the ultimate professional and he has been from day dot from when I’ve seen him around on the tour.”
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