McIlroy’s driver was reportedly ruled non-conforming on Tuesday at the PGA Championship, and three days later McIlroy had hit just 10 fairways through 36 holes.

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?

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