Melbourne:
The world number 28 carded a final round of four-under 67 to finish 15-under for the tournament.
Poulter defeated Australians Marcus Fraser (12 under) and former US Open champion Geoff Ogilvy (11 under) for the title.
England's world number one Luke Donald was never in contention in Sunday's closing round and finished in joint 12th place on four under, 11 strokes behind Poulter.
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