New Haven - Petra Kvitova kept her chances of defending her Connecticut Open title alive with a comfortable 6-3 6-2 victory over Eugenie Bouchard.
The win moves the Czech into the quarter-finals and improves her overall record at the tournament to a brilliant 17-2.
The 26-year-old had to come from 3-1 behind in the first set and she did so by winning 10 games in a row to put her in a commanding position to see out the match.
Kvitova will face Ekaterina Makarova in the quarters after the Russian eased past Anastasija Sevastova in straight sets on Tuesday.
It will be the fourth time Kvitova and Makarova have clashed this year, with the Czech winning the latest battle at the Rio Olympics.
"I feel like I meet Ekaterina every week, it's really funny," Kvitova said of the draw. "I remember one year we played here as well and I beat her. So I hope that I can take some of the good memories from here and try to play my best again."
Agnieszka Radwanska of Poland, who also advanced in her second round fixture on Tuesday, will meet Kirsten Flipkens following the Belgian's 7-6 (3) 7-5 win over France's Caroline Garcia.
Elsewhere, second seed Roberta Vinci moved past Ana Konjuh in straight sets 6-2 6-2 and will face Johanna Larsson next after the Swede won a hard-fought match-up 7-6 (1) 6-4 against America's Shelby Rogers.
2nd rd
Kirsten Flipkens (BEL) bt Caroline Garcia (FRA) 7-6 (7/3), 7-5
Johanna Larsson (SWE) bt Shelby Rogers (USA) 7-6 (7/1), 6-4
Roberta Vinci (ITA x2) bt Ana Konjuh (CRO) 6-2, 6-2
Petra Kvitova (CZE x6) bt Eugenie Bouchard (CAN) 6-3, 6-2