Northern Ireland's Rory McIlroy says he is "concerned" by his shape heading into nan US Open adjacent week aft struggling pinch driver issues astatine nan Canadian Open.
The 36-year-old missed nan trim astatine nan Canadian Open connected Friday, finishing 9 complete par and 149th successful a 153-man field.
The Masters champion changeable an eight-over-par 78 during his 2nd information arsenic he struggled to get to grips pinch a caller driver.
McIlroy's erstwhile driver was ruled non-conforming connected nan eve of past month's US PGA Championship, pinch nan Northern Irishman going connected to decorativeness 47th successful North Carolina.
With a caller 44-inch driver successful hand, McIlroy recovered conscionable 13 of 28 fairways successful Toronto and he made a quadruple-bogey 8 connected nan par-four 5th spread aft a disastrous tee-off.
"Of people it concerns me," said McIlroy.
"You don't want to sprout precocious scores for illustration nan 1 I did today. I felt for illustration I came here, evidently pinch a caller driver, reasoning that benignant of was going to beryllium bully and lick immoderate of nan problems disconnected nan tee, but it didn't.
"Obviously going to Oakmont adjacent week, what you request to do much than thing other location is deed fairways. I'm still benignant of searching for nan missing portion disconnected nan tee. Obviously for me, erstwhile I get that portion of nan crippled clicking, past everything falls into spot for me. Right now that isn't. Yeah, that's a interest going into adjacent week."
With play starting connected 12 June, McIlroy has small clip to robust retired his issues from nan tee.
But nan five-time Major victor says he will trial respective drivers successful nan coming days to find nan correct one.
"I'm going to person to do a batch of believe and a batch of activity complete nan play astatine location and effort to astatine slightest person a amended thought of wherever my crippled is going into adjacent week," said McIlroy.
"I went backmost to a 44-inch driver this week to effort to get thing that was a small much successful power and could effort to get thing a spot much successful play. But if I'm going to miss fairways, I'd alternatively person nan shot velocity and miss nan fairway than not.
"I'd opportunity I'll beryllium testing rather a fewer drivers complete nan weekend."