Li leads the way as mistakes prove costly for Rory McIlroy and Shane Lowry

Leader Haotong Li of China, watches his tee shot on the ninth hole during the second round of the PGA Championship at TPC Harding Park. Picture: AP Photo/Charlie Riedel

There were plenty of low numbers to be had once again TPC Harding Park on Friday, but it was one very big number that ruined a rally by Rory McIlroy.

After fighting his way into the top-20 and rekindling hopes of snapping a six-year major drought, McIlroy threw all of his hard work away with a brutal triple bogey on 12th hole. A late birdie got him into red figures with a 1-under 69 and tied for 31st, seven shots off the lead.