They were supposed to be the favorite to win the Super Bowl. They got the talent on paper. A proven quarterback, a strong running back, superior receivers and a solid defense.
They had the potential to be as good as the other preseason favorite, the New England Patriots.
However, when quarterback Tom Brady went down, it should've been clear sailing for the Cowboys. But the road was much rougher than expected.
Here's a top 5 rundown of why the Cowboys blew a huge opportunity.