Having carded three bogeys, two doubles and a triple-bogey over the previous two days at the Kapalua Resort on the island of Maui, Spieth rebounded in flawless style with eight birdies in the final round, including five in the last seven holes.
"That was very satisfying," the world No 5 told reporters after finishing at 16-under 276, six strokes behind his friend Justin Thomas, who clinched his third PGA Tour victory.
"I had five over-par holes on each day the last two days that really kind of took my chances away at this tournament but to come back and fire a strong one today ... I certainly take a lot of confidence off this round going into next week."
Spieth, who won last year's Tournament of Champions by eight shots at Kapalua, will make his second PGA Tour appearance of the year at the January 12-15 Sony Open in Honolulu.
