Par-filled back nine keeps Rory McIlroy in contention at BMW

Rory McIlroy, the world's second-ranked golfer, dropped from co-leader to a chasing position during the second round of the BMW Championship at Bellerive on Friday. His back nine was marked by a series of pars, which kept him in contention despite failing to build on his first-round momentum. The article by Steve Coulter for Golf Channel examines the factors that held McIlroy in check during Friday's round.