US PGA 2013: Latest from second round as Jason Dufner leads

BBC Sport's Conor McNamara brings the latest from the second round at the US PGA Championship, as American Jason Dufner set a course record to grab the halfway lead.

At a sodden Oak Hill Country Club, Dufner shot a 63 to finish nine under par, with Adam Scott (68), Matt Kuchar (66) and Jim Furyk (68) all one shot behind.

US Open champion Justin Rose shot 66 to end six under, while British Open winner Phil Mickelson signed for a second 71 to end two over.