Andy Reid and Patrick Mahomes are nemeses to many in the NFL based on the Chiefs' track record of success approaching historic levels. Count the Chargers among the division rivals failing to live up to their end of the rivalry in recent years. When they meet Sunday at Los Angeles, Kansas City (3-0) seeks a sixth consecutive win over the Chargers (2-1) as the home team introduces first-year head coach Jim Harbaugh to what has become a one-sided AFC West fight with Reid and Mahomes. Turning the tables won't be easy. "Multiple challenges," Harbaugh said of facing the Chiefs before Los Angeles enters its bye week.