Australia are through to the Billie Jean King Cup finals after 18-year-old Taylah Preston crushed Mexico's Marcela Zacarias 6-1 6-1 at Brisbane's Pat Rafter Arena.
Preston's win on Saturday afternoon gave Australia an unassailable 3-0 lead in the qualifying tie.
On Friday, Australia's Ariana Rodionova beat the unranked Giuliana Olmos 3-6 6-3 6-1 in just over two hours, before Daria Saville thumped Zacarias 6-1 6-0 in 51 minutes.
On Saturday, world No.564 Zacarias rolled her ankle with Preston leading 4-1 in the first set.
The Mexican was at the back of the court writhing in agony after rolling her ankle during a rally.
It appeared as though the tie was about to be wrapped up there and then, but Zacarias took a medical timeout and received attention.
She showed great courage to return to the match, but struggled to stretch out.
Preston, 18, demonstrated outstanding composure in her debut BJK Cup appearance. The world No.136 lost her opening service game, but then reeled off six consecutive games.
She went after the game and hit seven forehand and backhand winners with confidence and precision in the first set after being given her opportunity in the reverse singles by captain Sam Stosur.
P,reston continued on her merry way in the second set to crush her gritty opponent. After Zacarias held her opening service game, the Aussie teenager won the next six games.