It's all up to Roddick. And it's going to be tough. LJubicic is playing like a top 5 player.
If Roddick wins and Agassi loses again, that will be a stain on Andre's record. His place in history is assured but IMO if he loses twice I think the guys on tour will see it as a sign that Agassi's natural decline, due to age and all, is really beginning to accelerate.