The Australian Open at Royal Sydney has suffered a big blow, with Adam Scott forced out of the tournament due to injury on Wednesday. Scott also withdrew from last week&aposs Australian PGA at Coolum after dislocating his right-knee in a surfing mishap. The World No.16 was set to tee off with US PGA regular Stuart Appleby and veteran Craig Parry in the marquee afternoon group on Thursday. First alternate – 22-year-old amateur Brett Rankin – will take his fellow Queenslander&aposs place alongside the former Australian Open champions. “I just didn&apost get enough time to recover from dislocating my knee cap on Sunday a week ago,” Scott told a large media contingent via telephone on Wednesday morning. “There&aposs still some swelling and I can&apost actually walk properly at the moment and I still can&apost extend my leg fully – it&aposs not really the hitting that&aposs the problem it&aposs the walking.” A bitterly disappointed Scott said while his troublesome knee is not causing him any pain, he is reluctant to prolong the problem following a horror run of injury and illness in the latter half of the season. “I&aposm disappointed and I feel I&aposve let a lot of people down but I certainly wasn&apost planning on any of this,” Scott said. He added: “(Leading up to) Coolum I worked quite hard on my game and made a few changes and I was really feeling quite good about my golf and I thought I could have a good run here in the Aussie events.” “So that was disappointing because for the first time in a while I&aposd seen some big improvement and good feeling in my golf game and I didn&apost even get to take that out on the golf course in the end.” The 28-year-old informed tournament organisers of his decision to withdraw early on Wednesday morning. “I truly believed when it happened that I&aposd be able to play this week,” he said. “In the past, I remember from when I&aposve done it before, I played the following week once in Europe and the last time it happened I played two weeks later and it was really in good shape after two weeks.” “Maybe I&aposm not that young any more and the body&aposs not healing that quickly.” Fresh from an excellent year on the US Tour and a last start win in the Australian PGA, World No.11 Geoff Ogilvy remains the favourite to win the coveted Stonehaven Cup.