Incredible mugginess from Del Potro at some points of this set, he did his best to throw away his lead and drop the set, fortunately Benneteau couldn't pounce as he doesn't have an extra gear in his game to do so.
You haven't been watching obviously. Del Po hit the lines on every shot for 5 games in a row, otherwise he'd have lost the set. He's had a couple dips, but mostly sterling play in the set. This "mug" nonsense