I think Lendl's approach to the mental side of the game has helped. Murray is clearly an emotional person and having that lack of emotion that Lendl appears to give off must have helped with Murray's focus.
I don't think Murray's talent has ever been in question, but that psychology to stop the choking was always missing.
And I'm sure Lendl is now thinking about the next one.
Every time Murray plays in a major it is an ordeal for anyone watching so credit to both player and coach.
"Tennis is just chess with balls."
Using: Dunlop Biomimetic 300