Jason Dufner is on course to win his first PGA Tour title as he maintained his lead after round three of the Zurich Classic in New Orleans.
The American carded a round of 67 to give him a two-shot advantage over the chasing pack on 17-under-par.
Canadian Graham DeLaet is currently second, while American John Rollins is tied with South African Ernie Els on 14-under. Steve Stricker is one of three players a shot further back.
Luke Donald, who needs to finish inside the top seven to regain his world number one ranking, is just off the pace as a round of 66 left him tied for eighth on 12-under.
