Hard to watch, especially as it suggests this may be a more serious recurring issue. Shapo's reaction - which showed how close they are and that they're both great kids - seemed to confirm this isn't the first time. He has played a lot of tennis recently, the conditions are tough, but it's still worrying. Hopefully it's more like when Djokovic had his breathing issues, something that can be managed and overcome, rather than something like what Mardy Fish had.
The match itself was uneven and sloppy, but a teaser of their respective abilities. I agree with those who say FAA has more potential, health issues notwithstanding. There's still a lot of projection required, but he has remarkable all-round ability, and you could see both strokes and his serve becoming bigger weapons with time. It will also be interesting to see where he lands between offence and defence as well. While not as flagrantly aggressive as Shapo, he constructs points very well
Shapo continues his inconsistent play, and he's becoming more transparent in his frustration. My best guess is it's a bit like a young pitcher struggling once the book is out on his stuff around the league, and he has to learn and adjust now that he can't just power through the best. That should come, especially as it doesn't appear - in my somewhat infrequent viewings - to be grounded in specific weaknesses on the court. In fact, I'd say he's moving better and showing more confidence at the net than a year ago, two weaknesses that were evident even when he shot up the rankings. A (new) coach may help though.