AUGUSTA, United States, April 12 (Xinhua) -- Jordan Spieth won the Masters golf tournament as the second youngest winner in the event's history on Sunday, finishing four strokes clear of the field with 18-under par 270.

The 21-year-old American, who carded a 70 in the final round, matched the 72-hole tournament record set by Tiger Woods in 1997.

"It's the most incredible week of my life," Spieth said. "It's a dream come true. I'm still kind of in shock a little bit."

American Phil Mickelson and England's Justin Rose shared the second place on 274.

Top-ranked Rory McIlroy, seeking a third consecutive major win, came fourth on 276 after a 66.

Woods, a 14-time major champion, was a joint 17th on 283.