This depends on a lot of things.
1) School you will be getting your PhD at
2) research and publication record as a PhD student
3) recommendations and networking with faculty members from ALL OVER
I will hopefully be starting my PhD next fall and I just started the entire application process including GMAT
Where are you from if you don't mind me asking and where are you getting your masters at?
What I have observed is that most PhD students (at least in my field) are from East Asia and that means universities must prefer these students.
I am assuming it is because of their strong quant skills. If you are one of them, consider yourself lucky.