SUTTGART, Germany - No.7 seed Anastasija Sevastova moved into the quarterfinals of the Porsche Tennis Grand Prix on Thursday as she defeated former champion and home favorite Laura Siegemund, 6-4, 6-3.
The Latvian never allowed Siegemund to spin her web and seal another Stuttgart upset, as she won seven of eight games played from 4-4 in the opening set to put some distance between herself and the German, but ultimately needed nearly two hours to book her place in the last eight.
"I think this match was not as high quality [as her first round], it was nerves and a little bit winning ugly," Sevastova said.
"I made the important points. Sometimes I was feeling good, sometimes not great, and the same with Laura. I thought the previous match against Ostapenko, I played a good third set, a good first set, so it was good signs for the clay courts."
The World No.13 did surrender an early 4-2 lead in the opener, with Siegemund finally breaking serve on her eighth opportunity of the set after it appeared she would see chances slip by in each of Sevastova's first three service games.
However, a mammoth eight-deuce affair in the set's ninth game on the German's serve proved to be the key break for the Latvian No.1, as she quickly sealed the set in short order after that.
The second set again saw Sevastova quell a comeback effort from the World No.99 despite her early lead, as she surrendered consecutive games and saw two match points pass by from 5-1.
However, Sevastova was ultimately able to seal a second career victory over Siegemund with her sixth break of the match, advancing to a quarterfinal meeting with No.3 seed Petra Kvitova.
After withdrawing from Latvia's Fed Cup tie over the weekend due to a back injury, the Latvian has found her feet on the European clay, reaching her first quarterfinal since the season-opening tournament in Brisbane.
"Clay, actually, is one of my favorite surfaces. I grew up on it. I'm feeling better day by day, and I'm moving better," Sevastova said.
"I played two matches, and I feel fine. My back is not bothering me, so that's a good sign."