Just my personal experience:
I am an international student with a degree in Business Econ (comparable to masters) and hence only two math and one statistics course in the first semester of my undergrad.
I spent a year as visiting student at a top 10 Econ PhD programm, doing the whole Metrics sequence and additional 1st and 2nd year courses.
I applied for PhD this year and got into Stanford, Yale, Northwestern and LSE.
Surely, you could do better, but apperently the Econ PhD course helped and the lack of math wasn't to tragic.