The court plays into Marcel's hands. The ball moves very quickly through the air, which suits the bigger server, in this case Granollers. However once the ball hits the court, it really digs in and slows down. The general pace suits Granollers a lot more, and I believe he'll be able to get at Nalbandian from a lot of positions on the court and expose his really poor movement.
I've always identified Indian Wells as an ideal place for Granollers to have a really good run. His draw on this occasion isn't bad at all.