American Max Homa held a two-stroke in the third round of the Wells Fargo Championship when play resumed after two weather delays at Charlotte, North Carolina.
A passing storm forced the delays with more rain scheduled for later and on Sunday.
Homa, a former US collegiate champion seeking his first PGA Tour win, was at 12 under through 12 holes when play resumed following the second weather delay.
Overnight leader Jason Dufner was a stroke back with Pat Perez and Joel Dahmen tied at ten-under and Englishman Justin Rose at eight-under.
Rory McIlroy, celebrating his 30th birthday, was tied for sixth at seven-under with Englishman Paul Casey and American Patrick Reed.
McIlroy had only one birdie through nine holes as he missed several putting opportunities, but Seamus Power claimed a couple of birdies to move to seven-under alongside McIlroy and in touch with the leaders.
