Murray is becoming apart of the "Big Four" very quickly. Im pretty sure most lower ranked players, will have an on-set of fear when they see they have to play Murray in the first round. In his current form, he is a weapon and a deadly one.
Four years ago he was more of a Ferrer. Getting to semi's or quarters, only to get demolished by Fed and Nadal, and a lesser extent Djokovic. Now he is a force to be reckoned with and has definately shown he can beat Fed, Djoko, and Nadal. Aka Mr. Gluten Free, Tennis Machine, Djokovic at US and also the thrashing he gave to Fed at the Olympics.
Honestly if he gets to the Final or even wins the whole tournament; I think it is safe to say he is apart of the Big 4. And he can keep up with maybe the soon to be Big 3 XD
I think the most interesting part will be, to see how Nadal's form is and whether all the Fishing and Clubbing will pay off in Brazil