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

The bad week started for the 36-year-old when USGA deemed McIlroy’s TaylorMade Qi10 driver non-conforming ahead of the first round. Rory later had to change his driver. Nonetheless, the 5-time Major winner now enters the penultimate round of PGA Championship with high hopes of bouncing back. He has previously won the Major twice in 2012 and 2104.