Day solid but Dufner charges in PGA
Jason Day's chances of retaining the Wells Fargo Championship have taken a hit despite putting together another solid round on day two at the Quail Hollow course.
The Australian shot a two-under-par 69 but is six shots behind Jason Dufner, who stormed to the lead after firing an eight-under-par second round.
Dufner, the 2013 PGA Championship winner, never looked back after pitching in from 35 yards for birdie at the first hole.
He added a 40-foot birdie putt at the penultimate hole en route to his 63 that matches his career-low round on the PGA Tour.
"I played what I would consider the scoreable holes really well, and then I threw in some others," the 42-year-old told PGA Tour Radio.
"That's what happens on a day when you get in the low 60s. Everything kind of meshed together."
With an 11-under 131 halfway total, Dufner heads fellow Americans Max Homa (63) and Joel Dahmen (66) by one stroke with most of the field back in the clubhouse.
Rory McIlroy seemed likely to remain close to the lead until he butchered the easy par-four eighth, his 17th, where his tee shot found a bunker and from where he took five more strokes to negotiate the final 55 yards.
He also bogeyed his final hole and signed for a 70 that left the two-times Wells Fargo winner five shots off the pace, where he is tied with American Patrick Reed.
Justin Rose was more pleased with his morning's work, a 67 to trail by six shots, where he is joined by Day, Englishman Rose, Seamus Power of Ireland and American Pat Perez.
Day's compatriot Matt Jones finished at two-under after shooting 70.
Queenslander John Senden shot 73 to drop down the leaderboard to one under after making a 68 in the first round while Curtis Luck, Rod Pampling, Cameron Davis and Mathew Goggin all missed the cut.