Australia's Lizette Cabrera has scrapped her way into the Hobart International quarter-finals after securing a second come-from-behind upset in two days.
The 22-year-old wildcard beat world No.62 Kristyna Pliskova 4-6 6-4 6-4 on Wednesday in just over two hours.
"That felt amazing. I was getting really nervous towards the end of the third set but super happy I got the win," she said.
"For me, it was just about staying calm and trusting I could beat her."
Cabrera, ranked 129, also came from a set down to defeat former world No.4 Caroline Garcia in the opening round in one of the biggest wins of her career.
Hailing from Townsville, Cabrera looked at home in the above 30-degree temperatures in Hobart.
"I train in this heat all the time back in Brisbane so I felt really comfortable out there," she said.
"In the third set, when I was feeling it, I thought if I'm a bit tired, she's probably feeling worse."
Cabrera has a wildcard at the Australian Open but the immediate focus is a final eight match-up in Hobart against big-hitting third seed Elena Rybakina, who has dispatched Frenchwoman Alize Cornet in straight sets.
In other second-round results, two-time grand slam winner Garbine Muguruza had a scare against Tunisian qualifier Ons Jabeur but prevailed 3-6 6-3 7-6 (7-4).
The Spaniard saved a match point in the rain-interrupted match. She will next meet fifth seed Veronika Kudermetova.
Fourth seed Zhang Shuai also progressed to quarter-finals, but Polish sixth seed Magda Linette fell in straight sets to America's Lauren Davis.