The 22-year-old rallied however, taking the second set comfortably and closing out a nervous decider to seal the match 3-6 6-2 7-5.
The Czech left-hander is in strong form coming into the tournament after winning the Rogers Cup in Montreal only three days ago. She will now face China’s Shuai Peng for a place in the last eight.
Up to now, 17th seed Anastasia Pavlyuchenkova has had a relatively easy ride in Cincinnati, producing a walkover in each of her two matches and is yet to drop a set. Germany’s Julia Goerges had looked strong in her opener against Shahar Peer but was overwhelmed by the Russian in the second round, losing 6-3 6-0.
It seems unlikely that Pavlyuchenkova will complete her hattrick of 6-0 second sets when she comes up against sixth seed Caroline Wozniacki in the third round. The former world no.1 was never troubled by Kazakhstan’s Sesil Karatantcheva, dropping only a single game as she raced to a 6-1 6-0 victory.