...Just have a laugh and shrug it off.
Djokovic is one of those players with big serve and forehand, very similar to Gonzo, so Massu should be able to play with him no prob, specialy considering Massu returns serve much better than Feña.
Also as someone else mentioned Djokovic is not that regular, he tends to risk to much like old-style Gonzo. This gives a good defender like Massu a chance to break. All in all, this is by no means an impossible game for Nico, could've been worse...Federer, Nadal, Gonzo, Davidenko...
Nico can win, but he will have to be at his best, even if he is two sets down, he has to keep pushing, but Nico doesn't need us to tell him these things. I know he will give all he's got.