Rory McIlroy was strolling towards the first tee when the horn sounded at the property to confirm a delay before the third round

McIlroy came in as the co-favorite, but his long-time dominance didn't show up in the first round as he struggled to a 74

Rory McIlroy had to switch drivers ahead of the first round of the PGA Championship after his gamer was deemed non-conforming, according to a report by SiriusXM PGA Tour Radio. McIlroy is known as the best driver of the golf ball of his generation.