Asked if the rivalry between Roger Federer and Rafael Nadal is the greatest ever, John McEnroe replied: "Their matches were definitely great, but there were big rivalries like Boris Becker and Stefan Edberg, Andre Agassi and Pete Sampras, me and Bjorn or me and Jimmy (Connors).
But the level reached by Roger, Rafa and Novak is historically unique. Those guys improve more and more, so they are calm when they face the youngest guys. As I grew up, many of the oldest guys thought, Oh, I am slower. It seems that's not happening to them."
On the United States not winning Grand Slams on the men's side since 16 years, McEnroe added: "Our country should actually need a new boost. Players who can compete for Majors and win them. There are some guys who are moving into the right direction like Taylor Fritz.
He just needs to continue like this and put an extra gear." On the Laver Cup, he concluded: "The attraction of this event is enormous. I would like to play it myself. It's also a big opportunity to be with the people I like.
And I hope to make a little difference, giving my team energy and confidence." On Team World's chances in the Laver Cup, McEnroe said: "We were very close to the win during the first two years. We are big outsiders but the format helps us.
You do not have to beat the top guys at the best of five sets. You just have to win two sets plus an eventual ten-point tie-break which normally requires from 60 to 90 minutes. We have players on the team who can beat anybody like John (Isner), Nick (Kyrgios) or Milos (Raonic). They already showed it and we just have to take our chances."