BOGOTA, Colombia – Alexandra Panova was taken to the limit twice by a determined opponent but the Russian continued her run at the Claro Open Colsanitas, overcoming Conny Perrin 7-6(7), 7-6(7) for a spot in the quarterfinals.

Panova was the author of one the first round’s most dramatic upsets, emerging victorious in a rain-delayed three set comeback against the No.1 seed Elina Svitolina.

In the second round against Swiss qualifier Perrin, Panova was taken to two very tight sets. She built up a 5-2 lead in both sets before the Swiss came back twice to force a tiebreak in each one. Perrin held set points in both sets, but each time Panova was able to find a way shut her out.

“My opponent played really well, she has a really heavy forehand,” Panova said about 20-year-old Perrin. “I got really unlucky when I was trying to close it out with 5-2, but she was playing really well, nothing I could do. Just fight.”

Bogota’s high altitude and sharp change in climate – today being the first hot and sunny day after a week of cold and rainy weather – was almost too much for the Russian, who had to receive treatment during the second set due to dizziness.

“I felt fatigue, I felt like fainting. I couldn’t look up,” Panova said afterwards. “It was cold yesterday, today it’s hot. It’s still a high altitude and even if I’m in great shape and very fit, it’s very difficult.”

Also into the quarterfinals are Amra Sadikovic – who’s enjoying a successful return to competition in her first WTA tournament since her 2014 retirement – along with Sílvia Soler-Espinosa and Sachia Vickery.