Rory McIlroy struggled off the tee throughout the week at Quail Hollow in his PGA Championship title defense, with the reason behind his woes emerging after the event

Heading into the weekend, it was reported that McIlroy had to switch out his driver because his regular driver was deemed non-conforming to USGA standards. While the PGA and USGA dismissed that anything nefarious was behind a non-conforming test result, McIlroy's absence for four consecutive days of media was not a great look for him.