The Ravens lost 27-24 in overtime to the Chiefs in Kansas City last season. That is their only loss during their past nine regular season games. The Ravens are itching for revenge and are better than they were last December when they met the Chiefs.
The main reason for this is the emergence of Lamar Jackson as a legitimate dual threat quarterback. He has thrown the same number of touchdown passes as Patrick Mahomes this season. Jackson has upgraded weapons supporting hin and a better group of running backs. 
Baltimore also has the superior defense. The Chiefs are dealing with two key offensive injuries - wide receiver Tyreek Hill and left tackle Eric Fisher.