The NCAA March Madness Tournament is known for upsets. Each year, there are a few low-seeded teams that come out of nowehere and surprise everyone. It’s called March Madness for a reason. But how deep do these underdog teams really go in the tournament?

Using Tableau, I took a look at data from 1985 to 2013 to examine win percentages as they relate to tournament seeding. The results are about what you’d expect: Higher seeds perform better. But how much better? Is seeding everything? Take a look for yourself.