I saw enough to say that the second was the key moment in that match and it turns out I was right. I went to bed thinking DelPo has confidence now but it the back of my mind I knew Roger would pull through and win in 4,at most 5sets but he didn't and that's why I put so much emphasis on the 5-4,30-0 moment.
For all the bellyaching about Fed's serve(which did suck last night if you look at the stats) the swiss was great off the ground for most of the first 2 sets. But as I said he saw that everything was going in and got cocky at 5-4 thinking that he could toy with delpo forever. He stupidly lost he 2nd set,which he shouldn't have and brough DelPo's confidence back. Look at the first 2 sets again,DelPo didn't know what hit him and after Fed started playing around the argie woke up and started pounding those balls and he turned the tide. At 2-0 on sets Fed wins,no question about it.
I think you are over analyzing when you compare the Fed-Roddick final and Fed-DelPotro. Federer didn't play great off the ground for most of the roddick match but his serve bailed him out in the end. And I'm sorry,if you lead 6-2 in the tie like Roddick did and you miss a easy volley that's premium choking although to Federer's credit he didn't give up. Roddick would have approached the game differently at 2-0 sets although it is possible that Fed would have won in 5,who knows? Break chances come and go in a match but choking like that messes with your mind and it shows how tough Roddick was,to lose the second like that and still take it to 5 sets.
Yes,Federer was clutch on key moments with his serve and it allowed him to win. I didn't take credit away from him,I just said that Roddick let him get back into the game when he choked in the tiebreaker. And Fed hit what,50 aces in that match? That's as much a sign of poor returning as it is of great serving.
In the match with Delpo,from what I saw,his groundstrokes were consistent but his serve wasn't. He was dominating DelPo even without a great serve but he let him have the second and in the end Roger paid for it.
You are getting too defensive about this. Many players have the game to beat top players on any given day,they just don't have the mental consistency to keep it together on any given day against certain guys. This is true for Fed as it is for all top players. You really think no one can take it to Federer? Nadal,Roddick,DelPo,Haas showed this year that they can hang with Fed but some of them made it,others didn't and it was all mental. Same with Nadal. Soderling,Djoker,DelPo,Fed showed that they can hang with Rafa and whether they succeeded or not came down to how they mentally handled the key points in those matches. This is true for ALL PLAYERS. You can have all the shots in the world,if you crumble mentally before the other guy,you lose. And obviously the quality of your game depends on how calm you are which again comes from your mindset.