Best Rivalry In Sports

I went with UNC-Duke for the poll.  I lived in North Carolina for awhile and I've been refused service for being a Carolina fan wearing Carolina Blue on gameday.  I'm also a Yankees fan and my boss is a Red Sox fan and we can get along fine.  We just don't talk about baseball.  UNC and Duke fans can barely speak to each other. 

I would have also like to have seen Michigan/Ohio State and/or Bears/Packers up there over say...Redskins/Cowboys and Mets/Yankees.

I mean the whole NFC East just hates each other, it's actually pretty disturbing.  And even though Mets and Yankees fans don't like each other, most will root for the other team if they make it to the World Series and they hardly play each other.

You forgot the Packers and Bears but I voted UNC and Duke. I as a UNC fan love to see Duke lose every single time.... lol

BTW, Duke needs men in speedos to win. We just have to good players.

while you may think i am being a biased Chicago i think that there two other options

Bears Packers
Whitesox Cubs

The Cubs Sox rivalry has been one of the longest