Heavy rain halted play for more than two and a half hours before the round had to be stopped completely because of darkness.
Piercy, who hit 62 to lead after the first round, was through 12 holes on Friday before he was forced to leave the course.
The American carded an eagle on the ninth to hold a lead of two shots at the end of play with Johnson Wagner sitting in second.
England’s Paul Casey is three off the lead at 11-under after 12 holes, while Bill Haas is the clubhouse leader on eight-under.
Haas feels he's in a strong position having completed his round and insists he won’t change his gameplan going forward.
"I hear we may get a little wind tomorrow and Sunday so the scores won't maybe be as good," Haas said.
"I'm 8 under, try to get to 9 under and take it from there. I'm not going to change my game plan just because of my standing in a tournament."