Jordan Spieth described his victory in the Valspar Championship as "crazy" after a three-man playoff was won on the third extra hole.

Spieth won his second PGA Tour title after holing a 28-yard putt to beat fellow Americans Sean O'Hair and Patrick Reed.

"It was a crazy back nine being three down with six to play," Spieth told Sky Sports News.

"That was the best Michael [Greller, his caddie] and I have done together.

"That putt was just luck. If that doesn't hit the hole I've got a four-foot slider, but I guess it was my day."

The 21-year-old became the third-youngest player ever to win two PGA Tour titles, behind Tiger Woods and Sergio Garcia.