This is the first time in Olesen's career that he will defend a title and the 26-year-old is feeling the pressure.
"I've never tried it before, so I don't really know how it's going to feel on Thursday," said Olesen.
"But I've been looking forward to this tournament and looking forward to defending. So, hopefully it will be a good week."
"I think it puts more pressure on you, but it's also nice to go out there and know you can win on this golf course."
Also on his mind is the prospect of competing in The Masters, Olympics and Ryder Cup, a good performance this week could go a long way to making all this possible.
"The main goal is to get back in that Top‑50, be in all the Majors and the WGCs. It makes it a lot more fun to be in all those tournaments," added Olesen.
"It was a step in the right direction, with a couple of good weeks there in the Middle East. This week could help me a lot, also, if I can have a strong week."
"I think I'm in the team, so obviously I need to be in all the big tournaments to really compete in the spots for The Ryder Cup, it's definitely a goal. The Olympics, also; it's definitely two things I want."
After missing the cut at the Maybank Championship last week, Thorbjorn was happy to be back in Australia with the good memories from his win flooding back.
"I love it here in Perth. I'm really looking forward to this week, and looking forward to reminding myself of all the good memories on this golf course," continued Olesen.
"It's a great golf course. I think you really need to hit some great shots on this course. It can be really tricky."
Standing in Olesen's way of back-to-back ISPS Handa Perth International titles is a strong field including 2014 runner-up Victor Dubuisson and World Number 21 Louis Oosthuizen, as well as local hope Brett Rumford.
"This year, we have some great players. There are so many players that can win. You see that every week on The European Tour," added Olesen.
"You've got to play some great golf and you've got to hole the putts to be up there in contention."
"It's always difficult, but it's nice for me to know that I played well in this golf course and I really enjoy it."
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