Chicago, June 10: Darren Clarke will not hold back at this week's US Open in Chicago. The 34-year-old believes he must be aggressive to win his first Major. If he succeeds he will be the first non-American player since Tony Jacklin in 1970 to take the title. "I've tried to play sensibly in the US Open in the past," he said. "I want to go and be a bit more aggressive this time. I want to have a go. "I've hit irons off the tee and it's not worked for me. I might as well go and have some fun - finishing 30th or something is a waste of time. "If I try this and it doesn't come off and I'm coming home Friday night then at least I've gone out having a go." Clarke's aggressive approach may well pay dividends - his driving statistics in the seven appearances he has made in America this year have seen him average 294.5 yards off the tee and hit 71.1% of fairways. That puts him ahead of noted big-hitters such as defending champion Tiger Woods and Open champion Ernie Els. This week will be his eighth US Open and his best finish was 10th in the 1999 championship at Pinehurst won by the late Payne Stewart. Coach Butch Harmon has spoken of Clarke's need to pull in the reins on his power sometimes but the Ryder Cup star admitted: "I don't listen to him all the time." But Clarke also knows that to win the US Open, he will need to think positively. "It's the most mentally demanding," said Clarke of the tournament. "And I'd have to agree that that is the part of the game I've struggled most with. It's a continual battle." Bureau Report