And when the current world number one and two decide to hang up their rackets there are many questions as to who will top the rankings.
But tennis legend Rod Laver thinks there is one young player who has all of the right credentials to break the mould.
And that is Australian Nick Kyrgios. The 22-year-old was knocked out of the round of 16 at the Australian Open by number three seed Grigor Dimitrov.
However, he put in an impressive performance to beat Jo-Wilfried Tsonga to reach that stage.
He also has a history of beating to likes of Nadal, Federer and Novak Djokovic at Grand Slams, which Laver finds incredible.
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“I think, you know, Nick Kyrgios could be the best player in the world,” Laver told Fairfax Media.
“He has the markings of all of it.
“So many other people have said the same thing.
“What’s he done? He’s beaten Nadal, he’s beaten Federer, darn near all of them, at their best.”
Federer went on win his 20th career Grand Slam at the Australian Open but Laver still picked out Kyrgios as the one to watch out for this season.
“I think his mental approach has changed – winning the Brisbane tournament,” Laver added.
“Nick, I think, is ready to get involved. Beating (Jo-Wilfried) Tsonga in Melbourne here is a great start.
“I just believe that he’s ready to sort of do something.”