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.

There is precedent for what Rory McIlroy will need to do at the PGA Championship to win, but he is not going to like what that is.