Disagree with the OP. When Djoker decided to continue playing MC and face Nadal in the final despite his personal tragedy, that was when he ceded whatever mental edge he had gained over him in the past year. It was like an open invitation for Ralph to destroy the man who was already down and probably didn't want to be there playing. This definitely gave Nadal the belief to beat him later and perhaps put a little bit of doubt in Djoker's head the next time they faced each other.
Contrast this with Ralph who smartly avoids playing when he thinks 'he is not at his best' rather than accumulate losses or cede the mental edge he has over players.