Lucas Herbert surrendered his outright lead of the Australian Open and will go into the final round tied with American Ryggs Johnston while South Korea’s Jiyai Shin took the outright lead in the Women’s Australian.

Lucas Herbert clung to a share of the lead at his home Australian Open on Saturday as American rookie Ryggs Johnston made a charge in a waterlogged third round and favourite Cameron Smith crashed out of contention.

Jiyai Shin's stunning finish hands her a lead over Aussie hope Hannah Green, while Ryggs Johnston, named after Mel Gibson's character from the Lethal Weapon franchise, shares top spot in the men's event with Victorian Lucas Herbert.