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Winning the US Open at Oakmont would make Rory McIlroy 'feel like a more complete player'.
Oakmont is considered to be one of the toughest courses on the US Open rota - five-over-par was the winning score when Angel Cabrera was crowned champion in 2007 - and is a completely different to Congressional where McIlroy won his first major title in 2011.
The 26-year-old won the US Open with a record total of 16-under-par and went on to produce similar scores to win the USPGA twice and the Open Championship.
As he prepares for the year's second major, McIlroy admits the course is unlikely to suit his style of play and he believes it would be his 'biggest accomplishment in the game' if he were to emerge victorious on Sunday evening.
"I'd be very proud if I won on a golf course like this. The majors that I have won have been soft and (well) under par and more suits my style of game," McIlroy told reporters.
"But to be able to win on a course like this with the conditions the way they are, it would be maybe my biggest accomplishment in the game. (It) definitely would make me feel like a more complete player."
When asked how he feels going into this week, McIlroy added: "Trepidation, I guess.
"Excitement is a good way to describe Augusta, but this week it's not excitement. It's definitely not that.
"You know you're going to be put under a lot of pressure on basically every single golf shot you hit out there. So you have to be prepared for that. You have to be prepared for how mentally demanding it's going to be, how much concentration you're going to need out there.
"You expect that coming into a US Open. It's the toughest test in golf, and you know that, and you have to do everything you can to prepare for that and try to do your best."
McIlroy will play alongside Masters champion Danny Willett and Rickie Fowler for the first two days and the world number three believes in-form players will take a lot of beating at the Pennsylvania course.
"I would expect the more established players and those up near the top of the world rankings to do well this week because it is a golf course that can separate the players that are playing well from the players that are just slightly off their games," McIlroy said.
"If guys are playing well and they're confident, you'll maybe get it around in under par. But the guys that are struggling, it will really magnify that weakness and you'll see a lot of high scores as well."