Here is another article, John McEnroe and Boris Becker on why the ‘Big Three’ are not being threatened… yet
“You look at a guy like Rafael Nadal, who is perhaps the modern-day Jimmy Connors, and the guy brings it every point,” states McEnroe.
“I don’t see those other players – every point – bringing it, and you have got to. The other problem is that these three players – Federer, Nadal, Djokovic – are the three best players that have ever lived, they are better than these other guys. That is the part you cannot escape.
“If you look at Shapovalov, he’s got the body and physique, even Felix Auger-Aliassime – another Canadian – who I both think will win a Grand Slam and both I think will be in the top five. But they’ve got to be bitterly disappointed. It’s more the mental part, but technically they haven’t advanced their games enough and they think it’s just going to happen. You need to have a plan B or plan C if it’s not working particularly well.
“When you saw Federer play against John Millman, he’s 38 years old, his opponent is playing out of his mind, and is really taking it to him – you can see his mind working, trying to figure out how do I break this guy down.
Boris Becker thoughts:
“I don’t think it’s physical, I don’t think it’s technical, mentally they can’t cope with the pressure of expectations.
“The young guns are missing a bit of guts. A bit of balls. A bit of ‘okay, I’m here and I want to win and I’m going to do whatever it takes.’ They all fit into the system a little bit and the question is who is advising them, who is coaching them.
“They think it’s about tennis; it’s not about tennis, it’s about attitude and putting it out there on the line. I find there is something missing that would change that. You want to see the young players beat the top three when they are still playing well.
https://www.tennis365.com/grand-slam/john-mcenroe-and-boris-becker-on-why-the-big-three-are-not-being-threatened-yet/
So those legends agree with us tennis fans, it's more on the psychological part of the game.