Pak, a three-time champion of this event, was at 8-under through 13 holes when play was suspended on Saturday due to thunderstorms. Upon returning to Highland Meadows Golf Club Sunday morning, Pak parred her first four holes before a bogey at the par-5 last reduced her advantage to a single stroke.
Han, who won last week's Wendy's Championship for Children, was also through 13 holes when play was stopped on Saturday. She came back with a birdie at the par-5 17th on Sunday to finish one shot off the lead after a round of 66.
Jung Yeon Lee completed a 64 of her own to finish alongside Laura Diaz at 11- under-par 202.
Nicole Jeray and Marisa Baena were one shot further back at 10-under-par 203.
The final round is set to begin Sunday at 9:30 AM (ET).