Charleston - Sara Errani of Italy has rallied to defeat Peng Shuai of China 7-6 (6), 7-6 (5) and advance to the Family Circle Cup quarter-finals.
The 11th-ranked Errani lost her previous three matches to Peng and appeared in trouble on Thursday after trailing 6-5 in each set.
Errani squandered three match points in the second-set tiebreaker until she placed a drop shot that Peng could not track down to finish it.
Daniela Hantuchova of Slovakia won a third-round match over Teliana Pereira of Brazil in straight sets.
No. 2-seeded Jelena Jankovic, seventh-seeded Sam Stosur and 11th-seeded Venus Williams played for spots in the quarter-finals late Thursday.