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

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

Scottie Scheffler, the No. 1 player in the world, called mud balls one of the most frustrating issues a professional golfer can experience.

What happens when a winner's equipment is found to be non-conforming after the fact? We look at recent examples from Rory McIlroy, Tiger Woods and Tom Watson.

Xander Schauffele has revealed Scottie Scheffler also had to swap out a non-conforming club at the 2025 PGA Championship. Scheffler claimed major glory at Quail Hollow Club on Sunday after another

"I think, if we're going to do it, we might as well do it right, get more robust and get even more strict,” Scheffler said.

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

Scottie Scheffler's US PGA win a year on from his arrest at Valhalla is further confirmation of his extraordinary mentality and competitive nature.