After Scottie Scheffler's latest win at the Memorial Tournament, much of the talk coming into this week's RBC Canadian Open was how Rory McIlroy would respond in his first start since the PGA Championship.

McIlroy turned in 5-over 40 and then started his back nine in bogey-double-par-bogey. In danger of shooting in the 80s, he played his final four holes in 1 under. The 78 was McIlroy’s worst score since shooting the same number in the first round of last year’s Open Championship.

McIlroy shot an 8-over 78, making a mess of the fifth hole with a quadruple-bogey 8 in his highest score since also shooting 78 last year in the first round of the British Open. He had a double bogey on No. 11, four bogeys and two birdies.