TALLADEGA, Ala. — Daytona 500 winner Matt Kenseth won Sunday at Talladega Superpeedway, where a last-lap crash turned defending NASCAR champion Tony Stewart upside down. Stewart was leading the final lap but had no drafting partner as the field closed in on him. He was looking for help when he misjudged how much room he had and turned down in front of Michael Waltrip.