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.

Haigh said the standard process is for one-third of the 156-man field to have driver tests and that was the case at Quail Hollow.

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.