Rory McIlroy had to adapt quickly ahead of the PGA Championship. The 36-year-old has had to use his backup driver at the event after his regular driver was ruled "nonconforming," per ESPN. McIlroy made the cut but currently sits tied for 62nd at plus-one.

Is the reason that Rory McIlroy switched drivers this week because it was deemed non-conforming by the USGA during random club testing? That’s the rumor – unconfirmed so far – that began floating around on Friday afternoon.