The ups and downs of Andy Murray

Andy Murray beats Novak Djokovic;  why can't he do this in a Grand Slam event?

Murray ends Djokovic’s 10-match winning streak, setting up Dubai final with Federer

But this is what he does in Grand Slam events:

Roger Federer edges Andy Murray 7-5, 6-4 to win his 5th Dubai Championships title

It's going to take an act of God for him to win Wimbledon.  But I'd still like to see it happen.