I'm sorry but Duke is not good this year. I wouldn't count that as an "impressive win".
It's more impressive than you think. Duke got a big win against Louisville last night. Also, Duke is basically the UT of college basketball this season. 4 of their 6 losses were by one possession - 4 losses by a total of 13 points - it's not like they were getting beat by 10+ every game like ppl want you to think. A couple of good bounces or better breaks and Duke could be a 2 loss team and top 5 in the country. And this is all without their most important player, Amile Jefferson. So let's not say they're not any good. Duke, like UK, is a team no one will want to play in the tournament, especially if Jefferson comes back.