Nadal: Invincible Djokovic a tougher opponent than Federer

All three athletes have held the number one position at different times over recent years, but Nadal claimed that Djokovic was at times an "invincible," opponent.

However, he found it impossible to deny that Federer was the best ever by another method of comparison, saying of the current No.2 ranked player:

"What with titles and what he’s accomplished that says he’s the best in the history of our sport. Is he the best I’ve played against? Well, maybe, yes, I’ve also played the great Djokovic, we’ve run into other really good players.

"But it’d be unfair to say that Federer isn’t the best I’ve ever played against because the titles and his track record prove that to be the case.

Nadal and Federer won two Grand Slams each in 2017 after Djokovic, Andy Murray and other top tennis players had to sit out much of the season with injury.