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Adam Scott of Australia hits a tee shot on the third hole during the third round of the Arnold Palmer Invitational presented by MasterCard at the Bay Hill Club and Lodge on March 22, 2014 in Orlando, Florida. Image Credit: AFP

Miami Adam Scott moved within reach of a wire-to-wire victory on Saturday at the Arnold Palmer Invitational, one that would all-but ensure he overtakes Tiger Woods for the world No 1 ranking.

Scott, the reigning Masters champion and first Australian to capture the green jacket, struggled to a one-under par 71 on Saturday but held a three-stroke lead after the third round at Bay Hill.

Scott, who led by a tournament-record seven strokes when the day began, stood on 15-under 201 after 54 holes with American Keegan Bradley second on 204.

“It was tough,” Scott said. “I got off to a tough start and fought my way back all day.”

Scott, at Bay Hill for the first time since missing the cut in 2009, matched the course record with a 62 on Thursday and equalled the 36-hole mark by following up with a 68 on Friday.

“They don’t just hand you PGA titles after 36 holes,” Scott said. “Everybody was making a run. I was battling but I’m in good shape for tomorrow.”

With 14-time major champion Woods absent due to a back injury that has jeopardised his chances of playing next month’s Masters, Scott would move just behind the American with a victory this week.

If neither Woods nor Scott play again before the Masters, as is expected, then a Bay Hill title would ensure Scott would become world No 1 for the first time in his career on the Monday before he defends his first major title, based upon points dropping off at the back end of the two-year ranking cycle.

Americans Matt Every and Jason Kokrak shared third on 205 with Italy’s Francesco Molinari and American Chesson Hadley on 206 and England’s Ian Poulter seventh on 208.

Scott opened with a bogey, had three birdies and two bogeys over the last six holes and sank a clutch seven-foot par putt at 18, a hole on which he made bogey on each of the first two days.

A nightmare start for Scott saw his tournament-record lead of seven strokes entering the weekend reduced to a single shot after only the first 70 minutes of play.

Scott opened with a bogey, missing an eight-foot par putt, and took another at the fifth, faltering on an 11-footer for par.

Hadley, meanwhile, had a torrid start with four birdies in the first six holes to reach 11-under and move just one stroke behind Scott.

But just when things looked bleakest for Scott, momentum swung again as Hadley found a bunker at the par-three seventh and took a bogey while Scott made a tap-in birdie at the par-five sixth, boosting his lead back to three strokes.

Scott began the back nine with a birdie and when he sank a 16-foot birdie putt at 13, the Aussie moved ahead by five.