The 27-year-old Scott started the day tied for fifth place but came out firing to stun his rivals with a total of 20-under 268 and finish ahead of Sweden's Henrik Stenson.

"This is my lowest ever score but the thought of a course record was never on my mind," said Scott, who became the first player to take the title for a second time after winning in 2002.

He was in terrific form from the start, sinking birdies on all the first five holes. He added another birdie on the seventh for a front-nine 30.

He said overnight rain and occasional drizzle on Sunday had made the course soft but added that the Doha Golf Course was tailor-made for him.

"It's a driver's course and it suits my game," he said.

The lowest score at the Qatar Masters was previously the seven-under 65 set by Sweden's Joakim Haeggman in 2004, which was later equalled by 2005 winner Ernie Els of South Africa.

Stenson finished second with 271 while South African Charl Schwartzel was third on 273. Stenson had a final round of seven-under 65 while Schwartzel carded a five-under 67.

Stenson, who had a share of second place overnight, equalled the previous course record with a seven-birdie final round. England's Lee Westwood also hit 65 but finished fifth after a poor third round, two shots ahead of Scotland's Colin Montgomerie.

Sweden's Johan Edwards, sole leader after the third round, finished fourth.