Rory McIlroy’s buildup to next week’s U.S. Open at Oakmont took a further concerning turn on Friday in the RBC Canadian Open. In his first start since his worst finish this season—a T-47 in the PGA Championship—the reigning Masters champion suffered an extremely rare setback—he missed the cut at TPC Toronto.

Rory McIlroy endured a day to forget as he missed the cut at the RBC Canadian Open after shooting a dismal second-round 78. The Masters champion carded a quadruple bogey, a double and four other bogeys in an eight-over-par round that left him languishing 21 shots behind halfway leader Cameron Champ, who finished on 12 under.