Cameron Champ takes lead at RBC Canadian Open as Rory McIlroy misses cut

McIlroy's round included quadruple-bogey 8 on the fifth hole wile he also made a double bogey on number 11 and four bogeys.

It was the Irishman's highest score since also shooting 78 last year in the first round of the The Open Championship with his form a concern in what is the final event ahead of US Open.

McIlroy said afterwards: "Of course it concerns me. 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 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."

Champ, meanwhile, made four birdies after shooting a 68 in the morning, a day after opening with a 62, to sit at 12-under.

Andrew Putnam was second after a bogey-free 62 on the course hosting the event for the first time.

Thorbjorn Olesen of Denmark, tied for the first-round lead with Cristobal Del Solar after a 61, had a 70 drop into a tie for third at 9 under with Canadians Richard Lee (64) and Nick Taylor (65) and France's Victor Perez (65).