MELBOURNE (AFP) - England's Ian Poulter, determined to pick up valuable end-of-season world ranking points, upstaged world number one Luke Donald at the Australian Masters at Victoria Golf Club on Thursday. Resplendent in matching purple outfit and purple shoes, Poulter carded a six-under-par 65 in perfect conditions around the tight, tree-lined, 6,297-metre layout in Melbourne's famous sandbelt. His only blemish was a three-putt bogey on the second, a 392-metre par-four. Poulter finished four strokes clear of countryman Donald (69), and led local golfer Ashley Hall by a shot. Poulter said he knew he had to get a wriggle on when he looked at the early scoreboard and noticed Hall was eight-under after 10 holes. The world No.28 said he was in Australia to improve his ranking in what will be his last tournament for the year. The presence of Donald in the field makes a good performance this week worth plenty of ranking points. "I am fully aware and I understand the world ranking points system... That's how most guys get paid nowadays is where they finish on the world rankings, so I'm fully aware of that and I'm fully aware it is my last tournament of the year. So I need to play well," he said.