Watch: Horford sends Porzingis' layup attempt flying

Kristaps Porzingis thought he had an easy layup over the much shorter Avery Bradley.

As the New York Knicks sophomore released his shot, however, Boston Celtics center Al Horford soared in for the block, sending the ball to his bench.

Boston's marquee free-agent acquisition finished with 12 points, three rebounds, three assists, and two blocks in 15:36 as the Celtics won Saturday's preseason contest 119-107.