ARLINGTON, Texas — Dwayne Harris' head was spinning.

Giddy just to be playing his first game for the Dallas Cowboys, the rookie receiver was learning on the fly, too.

Coach Jason Garrett had just pointed out a mistake Harris made running with the ball after his last catch, and now quarterback Stephen McGee was telling him to be ready for a blitz.

Harris saw it and caught a short pass in the middle of the field. He followed Garrett's advice all the way to the end zone for a 76-yard touchdown.

And it wasn't even his best play of the night.

That was a 13-yard touchdown catch with 15 seconds left, setting up a 2-point conversion that gave Dallas a 24-23 victory over the Denver Broncos on Thursday night.