Gloria Park and Eun-Hee Ji shared second place at 65 and Young Kim and Eva Dahllof were at 66.
"Wow, that was unbelievable," Creamer said. "What did we shoot here? Sixty. I didn't know. I didn't realize it."
Creamer said she hadn't realized the Highland Meadows Golf Club course was a par 71, thinking it was 72.
The LPGA record is 59, held by Annika Sorenstam.
Meg Mallon, Anna Acker-Macosko and Jung Yeon Lee have shot 60 on the LPGA Tour.
Creamer had a 27 on the back nine, tying the tour record for nine holes.
Lightning forced suspension of play with 21 players still on the course Thursday.
McPhee, Cokas 'working on their marriage' after affair
Beautician charged with giving client fatal silicone butt injection