The Chiefs entered Sunday regarded as having one of the NFL's best defenses.

Philip Rivers and the Chargers' offense made those across the NFL landscape think twice about that. Neither team's defense could stop each other, with the Chargers coming away with a 41-38 upset win.

Everyone knew the Chargers had issues on the defensive side of the ball. The Chiefs? Not many expected Rivers to be able to throw for 392 yards and three touchdowns. Rivers' final score came on a 26-yard pass to Seyi Ajirotutu with just 24 seconds to go in the game.

Prior to last week's game against Denver, the Chiefs hadn't surrendered more than 17 points in a game. In the past two weeks, Kansas City has given up 27 to Denver and 41 to San Diego. 

Making matters worse, the Chiefs have to face Denver next week.

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Aaron Wilson covers the Ravens for The Baltimore Sun.