According to a report, the Masters champion had his regular driver deemed non-conforming Tuesday and had to put a backup in play at Quail Hollow.

Rory McIlroy's driver was reportedly deemed "nonconforming" during a standard test earlier this week at Quail Hollow.

Rory McIlroy switched drivers at the PGA Championship after his original driver was rumored to be deemed non-conforming by the USGA. CHARLOTTE, N.C. – Is the reason that Rory McIlroy switched drivers this week because it was deemed non-conforming by the USGA during random club testing?