Russell Westbrook Chases James Harden Down at the Rim with Massive Block

Russell Westbrook is a man on a mission.

The Oklahoma City Thunder point guard chased James Harden down during the first quarter of Friday night's game at Chesapeake Energy Arena, denying the Houston Rockets shooting guard at the rim with a massive block from behind.

He then borrowed from teammate Serge Ibaka, celebrating the swat with a thumbs down.