I'm sorry I don't see it. He has had quite a few love service games alone..
Serve is not his problem, he hasn't really played badly at all, it's just in the last two games of this set he has been sloppy and not been putting Nadal away.
He absolutely must keep his focus/concentration.
I'm sure you'll notice what I'm talking about if you watch a rerun
Yes he's had a few love service games but when he's sloppy(like he's been the last couple of games) his 1st serve lets him down too often and that's when you need good serves more than any other time.
For example, when Federer's not playing at his best he usually still wins the game by hitting a couple of great serves which bail him out.