The USGA tested Rory McIlroy's driver and concluded that it did not meet established standards, forcing him to change it before the PGA Championship.

Latest scores as Rory McIlroy begins third round at Quail Hollow - Bryson DeChambeau, Scottie Scheffler and Matt Fitzpatrick are all well placed to contend for the PGA Championship as Rory McIlroy beg

McIlroy opened his campaign at Quail Hollow with a disappointing three-over-par 74. Despite beginning with a birdie on his first hole, the par-five 10th, the Northern Irishman struggled to find rhythm.