Watch: Antonio Brown's unreal TD helps hand Chiefs 1st loss

The Kansas City Chiefs are undefeated no more.

You can thank Antonio Brown for that, as the Pittsburgh Steelers wideout made an incredible touchdown grab to secure the win. Brown kept his concentration after the ball bounced off a Kansas City Chiefs defender, and then pulled it down one-handed before racing to the end zone.

The score put the Steelers up 19-10 and they held on for a 19-13 victory. Kansas City was the last remaining undefeated team heading into Sunday.