Also, when the opponent puts you out of your comfort zone, you are bound to make more UEs, trying to go for more when you really aren't capable of.
Except that Ferrer was executing on his aggression a lot better in the second set than the first.
I'm not saying Ferrer would have won had he played better, just that it wouldn't have been a complete blowout. The tendency is to think that only the players you support can have dips in level. Everyone else is just constant all the time, so it all depends on your
player. I think that's what we see whenever Ferrer plays. He's a superhuman machine, so can't have good or bad days.