Australia is 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.
"It was very special to be able to win the tie for Australia to qualify for the finals," Preston said.
"Obviously being able to wear the green and gold … [is] extremely special for me, and hopefully it's not my [only] time and I get to wear it many more times."
"I was a little more nervous this morning [than at the Australian Open].
"Obviously I'm playing for something a lot bigger than just myself. I'm playing for my team. I'm playing for my country."
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 while Preston was leading 4-1 in the first set.
The Mexican was at the back of the court, writhing in agony after sustaining the injury 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.
Preston 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.
"That's how I like to play, aggressively, so even though I lost that first game I was like, 'You know, it's OK, that's just the first game, there's still so much to go,'" Preston said.
"It's definitely not easy to play when you know that the person down the other end isn't at their best.
"I just have to focus on what I'm doing on my side. Obviously that sounds a little harsh but it's the reality of it. We're in a match."
Preston has high goals for the rest of the year.
"As I start playing high-level tournaments and playing high-ranked opponents everything's going to become a little bit tougher," she said.
"At the moment this is really new for me. I'm learning a lot. It would be great to be able to crack the top 100."
Stosur was thrilled with Preston's display
"What a performance … incredible for a debut," Stosur said.
"I just said to Taylah we're all behind her, we all believe in you. Enjoy the moment, get out here and play the way we know you can play."
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AAP