Bo van Pelt will take a one-shot lead into the final round of the Perth International thanks to a five-under third round of 67.
The American, who holed a 60-foot birdie putt on the final green, leads fellow American Jason Dufner by one shot in Western Australia.
Both men shot 67s while overnight leader Emiliano Grillo dipped two shots behind Van Pelt because of a one-over 73.
Third-placed Grillo is three shots clear of the next challengers, England's David Howell and Alejandro Canizares of Spain.
