The Astros , who edged the Cardinals in head - to - head games , 9 - 7 , were seeded as the division winner in the post-season .
The Cardinals were seeded as the wild - card .
The Astros , who edged the Cardinals in head - to - head games , 9 - 7 , were seeded as the division winner in the post-season , and the Cardinals were seeded as the wild - card .