Del Potro is a horrible match-up for players like Verdasco, completely neutralizes those dangerous left-handed spins and produces deep, powerful shots which are really damaging for Fiasco's gameplan.
All cross-court forehands by Nando will land on Potro's comfort zone, the only chance for The Spaniard is to exploit JM's movement and maybe lack of fitness( he wasn't tested physically here).
Pony in tight 2 sets.
You seem to be confusing Del Potro pre-injury and Del Potro post-injury...
Pony with a high percentage serve might make it a tight one, but the final winner is inevitably for the high ranked, in form, tittle defending player.
I don't expect it to be that tight actually, 6-4 6-4 or similar for Verdasco