Teenagers Su-Hyun Oh and Ariya Jutanugarn were refusing to buckle under the final day heat as they led the Ladies Masters field into an intriguing last nine holes at Royal Pines.
Starting the final round tied for the lead at 10 under, both took the outright lead before going to the 10th tee locked at 11 under.
Oh birdie her way back into the outright lead at 12 under at the eighth before a three-putt bogey at the ninth hole dropped her back into a share of the lead.
Hot on their heels though were American teenager and current Australian Women's Open champion Jessica Korda, looming dangerously at 10 under, one ahead of four players on nine under, including Australians Karrie Webb and Stacey Keating.
Webb pulled to within one shot of the lead with an early third-hole birdie but had to settle for six straight pars to turn in 35.
She recovered from a wayward tee shot at the 10th which took a huge bounce off a cart path.
Keating also threatened to overhaul the two teenagers, her playing partners in the last group, with an eagle at her third hole only to hand a shot back at her next hole to slip back to nine under.
Korean So Yeon Ryu (six under through 12) and Sarah Kemp (five under through 12) were the best final round movers.
Italy's Diana Luna was forced to withdraw playing the 10th hole at two over with a rib injury.