There is Kansas v. Missouri; bad blood going back to Bloody Kansas.
I will agree that the KU MU rivalry was a great one that lasted for a hundred years. Then MU ran off to the SEC and it ended some years back.
MU could be at the top of their game and sometimes loose to KU. They HATED it. Kind of like in the old days when the MU basketball team playing at KU would spend the night at a downtown Kansas City, MISSOURI hotel spending big bucks, gas up the bus before crossing the state line and then make a point of not stopping or spending a dime in Kansas.