FOXBOROUGH, Mass. — There were big plays all over the field. The Chiefs, not the Patriots, were making them.

Alex Smith threw 2 long touchdown passes and rookie Kareem Hunt, after fumbling on his first NFL carry, scored three times to help Kansas City stun New England 42-27 on Thursday night in the season opener.

Hunt set an NFL record for a pro debut since the 1970 merger with 239 total yards.

Coming off their sensational Super Bowl rally to a fifth Lombardi Trophy, the Patriots faded badly in the second half. A raucous sold-out crowd of 65,878 celebrated the unveiling of yet another championship banner, and there was plenty of talk about Tom Brady leading them to a 19-0 record. After Week 1, though, they are winless.

It was the first time the Patriots lost at Gillette Stadium when leading at halftime, a span of 82 games. The 42 points were the most they have allowed in coach Bill Belichick’s 17-plus seasons.