The Northern Irishman went from favorite to at Quail Hollow to struggling off the tee. It might be more than a coincidence.

Rory McIlroy hasn't had his best stuff so far at the PGA Championship, but he still has an outside chance to make a run after making the cut on the number. The Masters champion struggled to hit fairways during his first two rounds before the news broke that he is using a backup driver this week at Quail Hollow.

About 50 players including Rory McIlroy had their drivers tested ahead of the 2025 PGA Championship, according to a statement from a PGA of America representative.