FBO: The rise of the Packers' defense

This was a common sight in the early evening hours of Sunday. Jeff Hanisch/US Presswire

Any Given Sunday, written each Tuesday by Football Outsiders, looks back at the biggest upset of the previous week in the NFL -- and where the two teams involved can go from here. This week focuses on the Green Bay Packers defeating the Dallas Cowboys, one week after the Cowboys looked very strong in a win over the Philadelphia Eagles on the road.

A week ago in Any Given Sunday, we discussed the Packers' woeful offensive line and their bleak postseason outlook. Seven days later, Green Bay finds itself in the thick of the playoff hunt, thanks to a 17-7 win over the Cowboys that was led by the best defense in the NFL.