Australian legend Rod Laver says he considers Roger Federer to be 'the champion of his era,' and he wouldn't rule out more Grand Slam titles for the 39-year-old.
Federer has been out of tennis for a year after requiring double knee surgery, but he has resisted any urge there might have been to call time on his career during his absence.
He will return to the court in March, though, and Laver believes he is still the man to beat in the greatest of all time race.
"For me, I think Roger Federer is the champion of his era," Laver told Fox Sports.
"I think he’s certainly, you know, you look at his record and there’s a lot to say he’s the best of all time."
"But give some of the other guys a little bit more time, maybe they’ll come up and meet and be as good as Roger.
"Djokovic is certainly on his way (along with Nadal), because he won a huge amount of tournaments and his consistency is amazing."
Federer decided to miss the Australian Open for the first time as he continued his rehabilitation from a knee injury, but Laver is confident there are still more Grand Slam titles in the Swiss ace.
"Roger, when I chatted to him the past year or so, he thought he’d play his best until he’s 40 and I think he’s pretty much on it," Laver added.
"Unfortunately, you know, his knee has been giving him some trouble. So he had an operation on the knee that will set him in good position.
"I wouldn’t think too much about him winning the French, but I think Wimbledon is certainly going to be there and the US Open.
"I think he can win more tournaments."
For more exclusive content from Tennisbuzz, including news, features, trivia, promotions and more, please be sure to sign up for our newsletter below or via our home page.
Why not test your tennis knowledge by tackling one of our fiendish quizzes too?