Spieth capped off a dream season when he poured in putts from all over East Lake and closed with a 1-under 69 for a four-shot victory.
That was all he needed to become the youngest player to capture the FedEx Cup and its US$10 million bonus.
His fifth victory of the year, including two majors, allowed the Texan to set a PGA Tour record with US$12,030,465 in earnings.
If that wasn't enough, Spieth went back to No. 1 in the world.
Stenson couldn't do much about it. On two holes around the turn with the Swede in tight for birdie, Spieth made two birdies, one from 45 feet.