Bags is a good dude and a lot of fun to watch but I don't think Ferrer needs to have an 'on' day. His "on" is all about his consistency which he has in spades. Guy just doesn't miss..you literally have to "big shot" knock him off the court (e.g. Djoko) and I'm not sure Bags can 'bang big' consistently for 3-5 sets.
~ILC's a kumquat~
The hotdog's the most noble of dogs. It feeds the hand that bites it.