I agree with a lot of what Izzle has written above. If we take Djokovic out of the conversation for a minute, I think only Sinner and Medvedev have the shot consistency to hang with Charlie. The problem with Medvedev is that although he is a wall and gets everything back, so does Charlie and he also has the variety with coming to the net and excellent drop shots to keep Meddy off balance.
As for Sinner, tons to like about his game and he does hit very hard off both wings. That along with shot tolerance are the main reasons he gives Charlie trouble. I see those guys being ranked #1 and #2 for the foreseeable future and that's the main concern regarding Jannik as he still has the tendency to breakdown and have conditioning issues the further he goes in grand slams.
It is going to be awesome to watch how this rivalry unfolds, though. Two guys to keep an eye on though in the future are Jiri Lehecka and Jakub Menšík, they both hit big off both wings and in my opinion are future top 10 players, it's only a matter of time.
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