Rafael Nadal and Roger Federer will only retire when forced out, says legend

Gustavo Kuerten believes Roger Federer and Rafael Nadal will only retire when then younger players force them to do so.
Speaking to Mundo Deportivo, Kuerten also mentions Novak Djokovic, but he believes he has more longevity in him than the other two.
“There is [only] one way to remove this unbelievable generation,” the Brazilian said.
“They have been here for 10 or 15 years and will stop only once others step up.
“I have very good feelings. Everyone is at the limit, but I see Djokovic with more margin, which makes the Tour more interesting.”
Kuerten added that he was heartened by Alexander Zverev’s recent breakthrough at the ATP World Tour finals, and he has likened that to his own big break in 2000, suggesting the German could be the man to oust the big three.
“Zverev makes me remember of the tournament I won in Lisbon”, Kuerten added.
“I also had to defeat the two best players (Pete Sampras and Andre Agassi).
“He defeated Federer and then faced Djokovic.
“For me, 2000 was like writing a book with all the anecdotes where nothing lacked, everything perfect”
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