ORCHARD PARK, N.Y. (AP) The Kansas City Chiefs can thank their opportunistic defense for keeping their perfect start intact.
Sean Smith returned an interception 100 yards for a touchdown and Tamba Hali scored on an 11-yard fumble return in a 23-13 win over the Buffalo Bills on Sunday. The defense made up for a sputtering offense that managed just 210 yards, and for its own deficiencies.
The Chiefs gave up a season-worst 470 yards to a Bills offense that was led by undrafted rookie Jeff Tuel, making his first career start.
Kansas City (9-0) remained the NFL's only undefeated team and matched the best start in franchise history set in 2003. The Chiefs now enter their bye week before a key AFC West showdown against Peyton Manning and the Denver Broncos (7-1) on Nov. 17.
The Bills (3-6) were unable to overcome their own errors despite dominating nearly every offensive category. Buffalo had the edge in yards and first downs (25-15), and its 77 plays were 23 more than Kansas City ran.
The difference proved to be the Bills' inability to compensate for being down to their fourth-string quarterback. Tuel started in place of interim starter Thad Lewis, sidelined with bruised ribs. Buffalo's rookie starter, EJ Manuel, missed his fourth game with a sprained right knee.