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.

Rory McIlroy made an 8 on his fifth hole Friday at TPC Toronto, free-falling down the RBC Canadian Open leaderboard. After hitting his tee shot into the right rough on the par 4, McIlroy's approach shot from 134 yards traveled 165 — so far past the spectators around the green that they didn't notice it soar over their heads.

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.