Ash Barty continued her winning streak at the WTA’s Volvo Open with a tough win over Shelby Rogers.
World No. 1 defeated the American 7-6 (7-3) 4-6 6-4 to advance to the quarterfinals.
Rogers, a 28-year-old from nearby South Carolina, presented Barty with a real challenge in nearly two and a half hours of fighting.
The 52nd world player charged from behind to win the second set before equalizing four to all in the third.
But Queenslander have won the last two games to close the match, in the first clay court tournament of the season.
“It was a very quick turnaround,” Barty said of the surface change. “I still allow myself time to get used to it. But with each match it will get better and better.”
Fresh from winning the Miami Open, Barty will face Spaniard Paula Badosa on Friday for a place in the semifinals. Badosa defeated American Catherine McNally 6-3 6-3.
The Australian is the last of the top eight seeds left in Charleston.
Earlier, compatriot Ajla Tomljanović bowed in the last 16 after the defeat in straight sets by Sloane Stephens.
The former US Open champion triumphed 6-3 6-4 to end the dream Australian in the tournament.
78th tennis player of the world Tomljanović defeated American Christina McHale (6-3 6-0) and Marie Bouzkova (4-6 7-5 7-5) on the way to the meeting with 57th tennis player of the world Stephens.
Stephens will play for the semifinals against Russian Veronica Kudermetova.
Things are starting to get along, Stephens said.
“It makes me feel like just the return of competitiveness makes me happy,” she said. “And being able to punch without fighting my own brain is nice.”
Kudermet, who holds 15th place in the first season on clay, defeated Japan’s Kurumi Nara 6-0 6-3.
Also until the next round is 17-year-old Coco Gauff.
The 14th seed defeated compatriot Lauren Davis 6-2 7-6 (7-2), while Tunisian player Ons Jabeur also advanced after beating France’s Alize Cornet 5-7 6-3 6-3.
Gauff advanced to the quarterfinals of three of the last four tournaments. She said that when she lost several points in a row in the second set against Davis, she returned to the match.
“I try to keep track of that because sometimes you lose focus for 10-15 minutes, and those are three or four games,” she said.
Two-time Wimbledon champion Petra Kvitova, third seed, lost to Danka Kovinic of Montenegro 6-4 6-1.
The sixth seed, Garbine Mugaruza of Spain, was ahead in the match with Yulia Puntintseva of Kazakhstan before retiring with a left leg injury.