Rory McIlroy sets sights on long overdue fifth major title

Rory McIlroy admits a fifth major title is long overdue as he seeks a third US PGA victory with the added incentive of preventing Jordan Spieth from beating him to a career grand slam.

Spieth's dramatic Open Championship victory at Royal Birkdale saw him join Jack Nicklaus in winning three different majors before the age of 24 and he can surpass Tiger Woods as the youngest winner of all four of the game's biggest prizes at Quail Hollow.