Adam Scott had five front-nine birdies Sunday and another on 18 for a 5-under-par 67 and a four-stroke win over Englishman Ian Poulter in the Australian Masters, his first victory of the year.
Scott trailed by one after three rounds and led by the same margin after the front nine Sunday. But his playing partner Poulter bogeyed two par-5s in three holes on the back nine to fall behind by three after 14 holes.
Poulter, who shot 72 Sunday, then missed a one-foot par putt on 17 to all but hand the title to Scott, who finished with a 72-hole total of 17-under 271 at Kingston Heath.
Their final-round pairing turned into match play - the third-place finishers, New Zealanders Gareth Paddison (68) and Mark Brown (69), tied for third, eight strokes behind Scott.
Scott tapped in for birdie on the par-5 first to quickly pull level, and the lead changed six times in seven holes.
After trailing by three strokes, Poulter made it interesting with an eight-foot birdie putt on 16 to pull within two, and the margin could have been closer. Scott was short of the green, but pitched to within four feet and made his par putt to make the swing just one shot.
Poulter gave away any chance of catching Scott when he lipped out on 17, increasing the margin back to three before Scott's birdie on 18.
Graeme McDowell, the 2010 U.S. Open champion, finished tied for eighth after a 71 Sunday, 15 strokes behind Scott.