It's so mental right now it's ridiculous. Forget the double faults, when pressure was tight in that second set, he couldn't even find a first serve to save his life. I feel as if he dropped below 30% first serve at one point. His game looks good though, he was hanging in rallys well with Murray and Djokovic. He just needs to learn how to close out a set. It's a common problem that inhibits players. Look at Almagro he still can't close out a set or match to save his life and thats why he's never beat Ferrer even.