Roger Federer, Rafael Nadal and Novak Djokovic should not be taken for granted, according to John Millman.
The Australian lost 6-3, 6-2 against world No 1 Djokovic in the Japan Open final yesterday.
He then took he opportunity during his runners-up speech in Tokyo to warn supporters around the world.
“Sometimes I feel like these guys are just so good, sometimes, whether it be Novak or Rafa or whoever, we forget how good they are, what they’ve done and what Novak is doing is incredible,” he said.
“I hope people realise how good he is and not to take that for granted, because we’re not going to have these types of players forever.”
Millman has only beaten one of the current top three players in the world once.
That victory came against Federer in the fourth round of the US Open last year.
However, he fears the world may not be appreciating just how good the current leading players are – especially Djokovic, who has won 16 Grand Slam titles.
Millman added: “It sound silly to say, but I hope everyone all around the world realises just how good you are.
“You’re an absolute champion and you’re the type of person that’s going to be remembered forever.
“Your legacy is continuing to build and will live on long after you finish playing.”
Meanwhile, Djokovic wants to continue his form when he returns to action at the Shanghai Masters this week.
“It was a fantastic week in every sense,” he said.
“I felt great on the court, felt really welcome from the Japanese people off the court as well. They made me feel at home.
“Didn’t drop a set, played really well, served great. Just overall a great experience.
“I think this [was] a level higher than the last couple of months in terms of my tennis. And hopefully I can maintain that in Shanghai as well.”