Disappointed with the loss for Fonzie, but it is pretty clear what we're seeing: an elite player in the making who simply has to gain experience. He's still very much a rookie: let's not forget that he just played his 36th ATP level match. Here's where various players were at, at the same time:
Alcaraz: US Open, 2021. Carlos started it #55, ended it #38. Carlos was about five months younger than Fonzie is now.
Sinner: Rome Masters, 2020. Sinner's 36th match was his last in that tournament, which he finished #75. He was about five months older.
Djokovic: Rotterdam, 2006. Novak finished #67 and was about the same age as Fonzie.
Murray: Memphis, 2006. Andy just won his first title, and was #47. He was about the same age.
Nadal: Australian Open, 2004. Rafa finished #40 and was about a year younger.
Roger: Adelaide, 2000. Roger finished #62 and was a few months younger.
Meaning, all the recent greats were pretty similar in terms of where they were at in the rankings and age - though Carlos and Rafa were a bit further ahead and younger, but not hugely so.