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.

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

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.

Low scores were out there at TPC Toronto, but the world's No. 2 will be fighting merely to make the cut Friday

After a two-week hiatus from the PGA Tour following the PGA Championship, Rory McIlroy returned to action this week at the RBC Canadian Open—but his time in the tournament was short-lived. McIlroy struggled mightily over both rounds,

Things went wrong for Rory McIlroy at the RBC Canadian Open as he posted a ridiculous number to miss the cut and nearly finish dead last.

After an opening-round 1-over 71, Friday wasn't much better for Rory McIlroy, who posted a quadruple bogey 8 on the par-4 fifth hole.