Kansas City’s quarterback was making only his second career start.
The Chargers were flush with optimism from a 9-3 finish to 2017.
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And they were playing at home, even if StubHub Center isn’t the NFL’s most tilted venue.
The Chiefs won anyway Sunday, beating the Chargers for the ninth consecutive time 38-28 behind wide receiver Tyreek Hill and that young quarterback, Patrick Mahomes.
Hill caught seven passes for 169 yards and a pair of touchdowns, and returned a punt 91 yards for another TD.