The Pacers were in third place after 12-over-par 300 in the morning round.
But behind Matt Atkins’ career-best 7-under-par 65 and J.P. Solis’ 69, USC Aiken shot 282 in the afternoon to take the lead.
Columbus State (298-291) and Georgia Southwestern (297-292) are tied for second place.
The final round, consisting of 18 holes, will be today.
Atkins (78-65–143) and Solis (74-69–143) are tied for second place individually, behind Columbus State’s Bryan Lichimo (73-69–142).
USC Aiken’s Mark Dickson is tied for fifth individually at 71-73–144.
Taylor Welborn (77-76–153) is tied for 31st and Hayden Letien (79-75–154) is tied for 35th.