Exactly, you said it zethand. That's what Kiwi was missing in this match: he was missing the ability to knock at Federer again in situations that could have Federer seriously rattled.
For example, the way the third set started was toooooo good for Federer. He broke Kiwi in the 2nd game of the third set and this of course was a golden start again for Federer because it made him quickly forget the loss of the 2nd set, which was actually a kind of seldomly seen choke because he was up two minibreaks in that tiebreak already. I wished Kiwi would have played a closer third set, but the start was already sup-optimal. Towards the end of the third set, Kiwi played a great last game of the set as he was already down 0-40 on Federer's serve and with great play and very offensive returns (winners), he earned his first break point of the match there. Another return which would have been a winner was just barely denied by the net cord. But I think that was a good basement for a better fourth set.
The other thing was that he failed to consolidate the two breaks of serve against Federer. I wished that he held just one more time after these breaks, just for the feeling how it is to lead by break of serve against Federer. Damn!
Two key situations for me. A third one would be not high enough 1st serve percentage (not enough free/easy points and aces) over the whole match, especially in situations where it counted.
But overall I'm not so mad at Kiwi, because he did a better job than in his previous matches
Just the opponent was of a much higher profile of player...
Goooooooooooooo Kiwi for US Hardcourt Season!!!