Duke vs. North Carolina is arguably the most storied rivalry in men’s college basketball: two powerhouse programs a few miles apart, competing year after year for local bragging rights and Atlantic Coast Conference supremacy. The two schools play at least twice a year, and sometimes they cross paths in the ACC Tournament, but they’ve never faced off in the NCAA Tournament, aka March Madness, largely because the committee rarely puts them in the same region. But the Blue Devils and Tar Heels each won their respective regions this year, so they’ll face off this Saturday night in the Final Four with a trip to the championship game on the line. The storylines are extra juicy: Duke’s legendary and polarizing head coach Mike Krzyzewski is retiring after this season, and as an eight seed, North Carolina were not expected to make it this far; they ended the Cinderella run of 15-seed St. Peter’s last weekend. But even without those added layers of drama, Duke vs. UNC in the Final Four would automatically be the biggest game in the century-old history of the rivalry.