Apart from my few words on
this post, only a few things I can add:
I talked to a few people who saw him playing/practicing in person. They told me his power is insane. All players hit very hard in practice, but, according to this witness, he stood out. It is interesting to see that, no matter who he plays, he is never blown away, and he is always trying to dictate. One can see that he still lacks stamina both in the deep end of matches and tournaments. He is not the first promising Brazilian junior (we had our fair share of #1/junior major winners), but his odds are looking better by the day to be one of the best Brazilians ever (which is not much by this forum standards. If he breaks into top 20 he would be already the second best Brazilian ever, right now he is around #250).
I saw two or three of his matches. One thing that stood out is that, albeit aggressive, he has tennis IQ. Half the globe is betting on his potential. He just got a WC to Madrid as further evidence of that.