CALEDON, Ontario -- Masters champion Rory McIlroy tumbled out of the RBC Canadian Open on Friday with his second-highest score to par in any PGA Tour round of his career, with Cameron Champ taking a two-stroke lead into the weekend in the final event before the U.S. Open.

McIlroy shot an 8-under 78, making a mess of the fifth hole with a quadruple-bogey 8 in his highest total score since also shooting 7-over 78 last year in the first round of the Open Championship, which also was the last time he missed a cut.

He had a double bogey on No. 11, four bogeys and two birdies Friday.

"Of course it concerns me," McIlroy said. "You don't want to shoot high scores like the one I did today. Still, I felt like I came here obviously with a new driver thinking that that sort of was going to be g

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