Well, for me Delpo didn't suck on this tournament, I mean this surface is never his best. He needs it to be slower or faster, not this. And I think since his comeback last year, Franco may have advised him to stay back before he gets his big ground strokes back and that's how he played most of the matches, in a defensive style. I saw 4 matches of him in this Open and I think his ground strokes are coming back, he's been more aggressive than last year and fear less to take advantage of short balls. And this match against Federer is the most aggressive match I've seen since his comeback last year. So he's regaining his shots, but mentally he's still not there, that's why he can't take chances of the break points and serve a df on set point.
But to me this is all becuz he hasn't played too many big matches last year, the 4 grand slams he played, he didn't play it that well, no big scenario. And this is his first QF in a Grand Slam since his comeback, this is huge, and he's nervous. But he is regaining his form, remember the 2009 QF? The same guy across the net, and he was in great form in 2009, and he only took 3 games outta Federer. This year, he's not in the same form (well Federer isn't neither), and he took 9 (well...), this says he is coming back step after step. So I'm looking forward to the rest of his years, after his ranking's rise, he shouldn't face some big players in the 1st few rounds so this gives him a chance to play himself deep into every single tournament.
Well but no matter what happened we still love him, that's the most important part.