Thursday will mark the 243rd meeting between Duke and North Carolina, a series that UNC leads 134-108. This is college basketball’s version of the Capulets and the Montagues: They may not know why they hate each other. They just know that's what they’re supposed to do.
Here are a few more.
Army - Navy
Michigan - Ohio State
Kentucky - Louisville
No professional sports teams? That’s no problem for the Kentucky and Louisville faithful. The two schools, 80 or so miles apart, have been going at it for decades.
UConn - Notre Dame
To be fair, anyone running with Connecticut recently hasn't had much luck, but Notre Dame has had as good a chance as any. The two teams have met 46 times, a span that includes six NCAA tournament matchups and two NCAA title games. UConn holds a 35-11 advantage, but from April 2011 to March 2013 this rivalry was all Notre Dame. The Irish won seven of eight matchups in that span, including wins against UConn on three occasions during the 2012-13 season, before falling to the Huskies in the 2013 Final Four. The kicker: Notre Dame hasn’t beaten UConn since. Though the two schools linked up in the 2014 and 2015 title games, UConn proved to be too much to handle.
Boston College - Boston University
Minnesota - North Dakota
Minnesota and North Dakota have linked up close to 300 times. Both meetings earlier this year -- the first regular-season meetings since 2013 -- ended in a tie. The last time the two schools met before that came in the semifinals of the 2014 Frozen Four, when a last-second goal from Minnesota lifted the Gophers into the championship game. (Minnesota would ultimately lose to Union in the title game.) The two teams link up again this week with a pair of games in Minnesota.
Texas - Nebraska
Each of these schools has won a national championship in the last five years. Nebraska has four (1995, 2000, 2006, 2015), while Texas has three (1981, 1988, 2012). They met in the final in 2015. The Cornhuskers won that year, but Texas took revenge by knocking out their rivals in the National Semifinal this year. The rivalry between the two schools goes back to October 1981 and has seen the two teams link up more than 50 times.
UCSB - Cal Poly
Alabama - Oklahoma
South Carolina - Clemson
Henderson State - Ouachita Baptist (Battle of the Ravine)
Wisconsin-Whitewater - Mount Union