Indeed. I'm not saying its just Murray that does this. Hwever it's his sarcasm and his woe-is-me attitude that's possibly holding him back. Somebody mentioned earlier he maybe needs a coach that will inject the belief into him and get him to think 'fuck it, that points gone, I'll forget about it'. His bad shots seem to play on his mind a lot more visually than the other players.
The Federer-Djokovic family spat video is quality.