Not severe, but not as "fully healthy" as you claim. There have been lots more niggles (and a surgery) in the past few years than he's had since back when he was the Retirement King of tennis.
When are tennis players ever injury-free? In 2008 Nadal lost to Ferrero in Rome partially because of blisters. Then he went on to that BS win over Federer in Hamburg the following week where Federer blew a 5-1 lead in the first set.
Players in their twenties deal with injuries and pains too. It's not just Novak Djokovic at the 2019 US Open who has ever gotten injured.
As usual, you can't help biasing and limiting your question with (currently) unmeetable criteria.
The reason I am limiting the criteria is that we are talking about only 4 events per year where the matches are played over 5 sets. Being able to give Djokovic a little bit of trouble at a Masters event is totally different than beating him at a Slam (look at Bautista-Agut).
But you act as if the landscape won't change for the next 5 years,
I am not merely "acting" that way. I am saying emphatically that Djokovic has no reason to worry about the dynamic at Slams changing in the next 5 years barring the rise of a player we haven't yet seen.
I was the only person on this board saying that 5-7 years ago, and look at where we are now - with the same Big 3 that there was at the time. Who was the only person on this board who foresaw that? The poster whose message you are reading right now.
That would be unrealistic for Nadal, but Djokovic is a better all-around player than Nadal. So the same standards don't apply to each.
Novak has the worst record, by a lot, of the Big 3 against the Next Gen. And some of those players are going to become more consistent at Slams in the next year or two.
What does that mean exactly? Losing in the 4th round instead of the 2nd or 3rd round?
What reason do you have to believe that any of them will be consistently making the quarters or semis tournament after tournament?
My point about the Next Gen hasn't been so much about the one particular breakout, but that the onslaught will cause more upsets over time.
Yes, and I have told you that's just your wishful thinking at work and that it is too nebulous to mean anything. Your posterboy for this change in the tennis landscape was Tsitsipas, whose victory over Djokovic in Shanghai you were utterly ecstatic about. What has ensued since? He has gotten trounced by Djokovic in Paris and flamed out early to Raonic in Melbourne.
That's a classic example of your nebulous generalities collapsing when you look at the specifics.
I mentioned Tsitsipas, who is in the top 10.
Yes, the guy who got pounded by Djokovic in Paris and then flamed out in the 3rd round of Melbourne right after you hyped him up.
Where did I say anything about a random young player in the top 50 taking Novak down?
That is one possible interpretation of your nebulous statements such as "My point about the Next Gen hasn't been so much about the one particular breakout, but that the onslaught will cause more upsets over time."
If we are talking about Slams specifically, that is a meaningless prediction without bringing up specific players who can trouble Djokovic over 5 sets at particular events.