Matt Cassel threw for 92 yards, was intercepted twice and credited with two lost fumbles before leaving in the fourth quarter with what the Chiefs described as a head injury.
Brady Quinn entered and led Kansas City to another field goal by Ryan Succop, but the Chiefs defense couldn't get the ball back and Baltimore ran out the clock.
(Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)