With San Diego’s 34-20 loss coming late Sunday afternoon in Cincinnati, the Kansas City Chiefs have clinched the AFC West in just Todd Haley’s second year as head coach, and one year after a 4-12 season.  The Chiefs are division champs for the first time since 2003.

Matt Cassel threw three touchdown passes and Eric Berry returned an interception 54 yards for another score as Kansas City romped past Tennessee 34-14 Sunday. Cassel hit 12 of his first 13 passes for the fast-starting Chiefs (10-5), including touchdown tosses to Jamaal Charles on their first two possessions.

The Chiefs’ AFC West lead went to 1 1/2 games pending San Diego’s late start at Cincinnati. The Chiefs’ six-game improvement from 4-12 in 2009 is a team record.

Dwayne Bowe had six catches for 153 yards, including a career-long 75-yard touchdown as the Chiefs are 7-0 at home. If the Bengals beat the Chargers, or a Chiefs City wins at home next week against Oakland, the Chiefs clinch their first AFC West title since 2003.

The Chiefs had 327 of their 458 total yards and all but three of their points while rolling up a 31-7 halftime lead.