Rory McIlroy knows his form is a problem heading into US Open

Rory McIlroy admitted he is concerned about his form ahead of next week’s US Open after missing the cut at the RBC Canadian Open.

The Masters champion shot a dismal second-round 78 on Friday, carding a quadruple bogey, a double and four other bogeys in an eight-over-par round that left him languishing 21 shots behind halfway leader Cameron Champ, who finished on 12 under.

It is the first time the world number two has missed the cut since the Open at Royal Troon last July.

McIlroy’s round continued his troubled build-up to next week’s US Open at Oakmont having been forced to switch to a different driver after his previous model was deemed non-conforming in a random test on the eve of last month’s US PGA Championship, in which he finished joint-47th.

“Of course it concerns me. You don’t want to shoot high scores like the one I did today,” McIlroy said on the PGA Tour website.

“Still I felt like I came here obviously with a new driver thinking that sort of was going to be good and solve some of the problems off the tee, but it didn’t.

“Obviously going to Oakmont next week, what you need to do more than anything else there is hit fairways. Still sort of searching for the sort of missing piece off the tee.

“Obviously for me, when I get that part of the game clicking, then everything falls into place for me. Right now that isn’t. Yeah, that’s a concern going into next week.”

McIlroy was already facing an uphill battle after shooting one over par on Thursday and his day began to unravel after taking an eight on the par-four fifth.

That occurred after he fired his second shot out of bounds from the rough and was forced to take a further penalty after playing a provisional. He then missed the green with his fifth shot and needed