Gary, he flunked 3 breaks of serve. He visibly tightened as the finishing line drew near. That, for me, is a choke. Fed was just hanging in there most of the time but, of course, that in itself is a tribute to his staying power and enormous experience.
I was watching REALLY carefully, and as I say it was long after the results. I rewound on multiple occasions.
There were a number of key points, and in the heat of live play you might have missed some of them. One really important point in a break was when Fed hit two freak shots in a row that both clipped the net. That was just incredibly lucky. Either one not going over would have changed that game.
The momentum was changing, but there were some freak shots like that, and Coric got most of them in the first half of the match.
Looking at the score only it does look like Coric folded. But I think he was playing above himself, and I think it's unrealistic to expect a kid his age, in this era, to continue that way.
He has around a 75% figure for winning service games, and that's against the field. That means that you can expect, on average, that he will be broken one time out of 4. Fed is still around 95%, but that's too high and will come down. 90% is more realistic. Expect him to get broken one time in 10, against the field.
You can't expect Coric to get closer to 90% against the top player in the world. His serve isn't that good. To me it looks like it COULD be, with some fixes. He may be an inch taller than his official height, and the kid is STRONG. I think the serve can be improved a lot.
If Delpo does the same thing today, I'll agree that it is a choke, because his service game is much stronger.
The difference everywhere else is that his strength goes against Fed's strength, so Fed would probably do well to play much as he ended up playing against Coric, going to the BH. My guess is that Fed will have learned from recent meetings and will not attack the strength this time. Delpo does not like to hit his BH down the line, so attacking the BH corner, then going down the line with the FH is probably a lot of what Fed will do, if he can't outlast Delpo on that wing.