No. Murray hasnt proved himself as being able to consistently meet and beat the best at the Slams. The two times he beat Nadal in a slam, he collapsed against Federer. There is no indication the same wont happen. Nadal is the ultimate big match player. Rafa wont have an inch, you have to wrstle it from him.
And anyway, the best I see him doing is going 1-2 against Rafa in a slam in a calender year. Andy just doesnt seem to have the head, the Wimbledon collapse was unbelievable and indicates no improvement to me.
Rafa is going Downhill...