Rory McIlroy was dealt a major blow before the PGA Championship

was dealt a blow just days before the start of this week's , it has been revealed.

The recently crowned Masters champion was forced to switch drivers here at Quail Hollow after his was deemed to be nonconforming by the USGA on Tuesday, .

McIlroy is arguably the best driver in golf. Using the TaylorMade Qi10 driver, he came into this week at the top of the rankings for strokes gained off the tee and third in driving distance so far this season.

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