American David Toms fired six birdies in a six-under-par 66 to seize a share of the lead alongside compatriot John Rollins after the second round of the US PGA Tour event at Country Club of Jackson.
Toms, whose 13 US PGA Tour wins include the 2001 PGA Championship, had a 36-hole total of 10-under-par 134.
Rollins also posted a 66, his coming with eight birdies and two bogeys.
They sit two strokes in front of Canadian Nick Taylor, who carded a second-round 69.
It was a further stroke back to Tom Gillis (68) and Robert Streb (70) on 137.
Toms posted his low score on a chilly morning playing alongside fellow former major champions Lucas Glover and Padraig Harrington of Ireland.
Glover, the 2009 US Open winner, carded a 67 that put him six under for the tournament while Harrington, whose three major titles include back-to-back British Opens in 2007 and 2008, carded a 69 that left him five shots off the lead.
“We probably had more conversation than I’ve had in a long time, just mostly small talk,” the 47-year-old Toms said of the group.
“But we have a lot in common, have played a lot of golf together, all three of us. We had a good time.”
Toms is seeking his first win since 2011, the same year Glover captured his last title.
“I’ve been real patient with my iron shots,” he said.
For the second straight day play was halted by darkness, with 15 players still on the course.
They were to return Saturday morning to complete the round, with the third round to follow.
Overnight leader Sebastian Cappelen of Denmark had two holes remaining in what had been a difficult round.
He was three over for the day through 16 holes to fall into a share of 21st place in the four-million-dollar tournament.
Rod Pampling the best-placed Australian at two under after shooting a round of four under.