Rory McIlroy suffered his worst PGA Tour finish at RBC Canadian Open, missing the cut amid equipment struggles and backlash from fans.

It is the first time the Northern Irishman has failed to make the weekend in a tournament since the Open Championship last July.

"I would certainly say that the last few weeks—I've had a couple of weeks off—and going and grinding on the range for three or four hours everyday is maybe a little tougher than it used to be," he to...