American Jordan Spieth wins Australian Open by 6 strokes in inaugural trip Down Under

Jordan Spieth of the US plays a shot from the 5th fairway during the final round of the Australian Open golf championship in Sydney, Sunday, Nov. 30, 2014. Spieth started the day co-leader at 5 under. (AP Photo/Rick Rycroft) (The Associated Press)

Jordan Spieth of the US makes a birdie putt on the 6th hole during the final round of the Australian Open golf championship in Sydney, Sunday, Nov. 30, 2014. Spieth started the day co-leader at 5 under. (AP Photo/Rick Rycroft) (The Associated Press)

SYDNEY – Jordan Spieth made his first trip Down Under a successful one, shooting an 8-under 63 on Sunday to win the Australian Open by six strokes.

Spieth's four-round total of 13-under 271 on the tough, windy Australian Golf Club made him the first American to win the Australian Open since Brad Faxon in 1993, when the 21-year-old Spieth was four months old.

Spieth birdied four holes on the front nine — three of them in a row — to lead by three after nine holes, then added four on the back nine, never threatening to lose his lead.

Adam Scott shot 71 and finished fifth, nine strokes behind. Defending champion Rory McIlroy, who shot 76 Saturday, finished with a 72 and was 2-over, 15 strokes behind Spieth.