Australia's Adam Scott fired a final-round 65 to ease to a seven-stroke victory at the $US2 million ($A2.63 million) Singapore Open on Sunday, the world number seven completing the tournament with a 13-under par 272 total.

Scott was one of 15 golfers forced to finish their third round in the morning after rain had curtailed play on Saturday, and he set up his victory with three birdies in the four holes he completed to take a one-stroke lead into the final 18 holes.

The 25-year-old Scott picked up $US315,000 ($A414,000) for his 10th career victory and second in Asia this season after April's wire-to-wire Johnnie Walker Classic win in Beijing.

Britain's Lee Westwood finished in second place after posting a final-round 68 on the tough, par-71 Serapong Course, and Australia's Andrew Buckle took third place a shot back on five under.

South Korea's Ted Oh was two shots further adrift in fourth place, one stroke ahead of Thailand's Thongchai Jaidee.

Overnight leader Edward Michaels of the United States struggled with a shoulder injury and stumbled to a final-round 79 to finish the tournament in a tie for eighth place on two over par.

Returning after a three-year hiatus as the richest Open on the Asian Tour, the event attracted a strong field and included four invited international players, Australians Scott, Nick O'Hern and Craig Parry and Englishman Westwood.

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