The former world No. 1 Jim Courier praised Rafael Nadal after the Spanish player's win over Karen Khachanov. 'We’re so lucky to get a chance to still see this guy compete', Courier admitted commenting the match on Amazon Prime.

'And do it at such a high level. He’s ever the professional. A lot of players who play around four and a half hours of grinding tennis wouldn’t be thinking about how to improve, they would be celebrating the moment.

But that’s not Nadal. He looks forward to what is ahead in this tournament. He left a mark on everyone in this stadium.' Commenting on Nadal's knee injury, Greg Rusedski said: 'He says it didn’t bother him.

He knows how to manage it and he knows what he has to do. And the good news is he didn’t take any painkillers on the court. When a player takes painkillers, then you know something is usually more serious. It could’ve gone either which way in all of the sets.

If he (Khachanov) looks back at this, he’ll be disappointed he couldn’t close out that second set, two sets to love. For Rafa to win three straight sets the way Khachanov was playing would be very, very difficult Nadal's coach Carlos Moya said: 'Rafa's knee felt sore but nothing to worry about.

Sometimes he feels it more than other but he deals with it really well so that's not an excuse.' ALSO READ: Rafael Nadal: Worse players than David Ferrer won a Grand Slam title