Rory McIlroy's PGA Championship performance overshadowed by driver controversy. USGA's non-conforming ruling led to equipment changes for several golfers.

Kerry Haigh, the chief officer for championships in the PGA, pointed out that the USGA does not want to get involved in whose driver is not in accordance with the rules.

Rory McIlroy did not speak with the media at the PGA Championship, as news surfaced that his driver had been flagged by the USGA.

Rory McIlroy entered Quail Hollow, a place he'd already won four times, as a strong favorite to win the PGA Championship. He left with a 47th-placed

The PGA Championship is one of the biggest events in the golfing world, but it isn't immune to trials and tribulations here and there

BBC Sport golf correspondent Iain Carter analyses the controversy of Rory McIlroy's "non-conforming" driver at the 107th US PGA.

Despite the off-course buzz, McIlroy remains one of the most dominant figures in golf. Just last month, he claimed his first green jacket at Augusta, marking his fifth major championship and giving him the career Grand Slam. He won the PGA Championship in 2012 and 2014.

Just when the leaderboard at the 107th PGA Championship was beginning to resemble a NASCAR pile up, world No. 1 Scottie Scheffler stepped on the pedal and finished with three birdies and an eagle on the final five holes to open up a three-stroke lead.