A 17-year pro seeking his first top-10 finish on the PGA Tour, Riegger missed the cut in his previous three tournaments this season. But his first round set a course record at the TPC at Heron Bay and his second round was good enough to keep him on top. Half the field, however, had not completed play and 24 had not even started the second round.
"It was a very long day, especiallly with the delay this morning," Riegger said. "I've been on my feet since 5 o'clock this morning."
Riegger finished 36 holes at 12-under 132. England's Paul Casey, one of Europe's rising stars who was strongly considered as a wild card pick last year for the Ryder Cup team, completed 14 holes in his second round and was two shots back at 10-under. Joey Sindelar played 36 holes without a bogey and was another stroke behind at 9-under 135.
Neal Lancaster, J.L. Lewis and Mike Sposa were tied at 136.
Rain interrupted play on Thursday and PGA Tour officials knew the entire field would be unable to complete 36 holes Friday. Play will resume Saturday at 7:30 a.m.
Notable deaths of 2014 [PHOTOS]