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?

It was the first meeting between the two major winners after Bryson DeChambeau said Rory McIlroy wouldn't talk to him at the Masters.