Spieth left flummoxed by final-round flop

Jordan Spieth played the final round of the Masters precisely how he planned - which is why he couldn't believe his run at another green jacket on Sunday turned into one of the worst rounds at Augusta National in his young career.

He was still shaking his head in disbelief when he walked off the course.

Spieth, the 2015 Masters champ, began the day at 4-under, two strokes behind co-leaders Justin Rose and Sergio Garcia, and was optimistic about his chances of winning a second Augusta title.