Former world number one Caroline Wozniacki won for the first time since Wimbledon, while Dominika Cibulkova endured another three-setter.
Caroline Wozniacki claimed her first win since Wimbledon in fine fashion at the Connecticut Open on Tuesday, while Lesia Tsurenko capitalised on her good fortune.
Wozniacki had lost all three of her matches since her run to the fourth round at SW19, but the four-time champion had a much-needed victory in the shadows of next week's US Open - thrashing wildcard Alison Riske 6-0 6-2 at New Haven.
The Dane reeled off the first seven games of the match - a fitting response to her first concession of a bagel set in three years against Victoria Azarenka in Cincinnati last week - and eased to victory in 58 minutes.
Awaiting Wozniacki next is another rampant first-round winner, Roberta Vinci, who lost just one game in thrashing Eugenie Bouchard on Monday.
Advancing to the quarter-finals were fourth seed Lucie Safarova, Dominika Cibulkova, Caroline Garcia and lucky loser Tsurenko.
World number 46 Tsurenko was thrashed in the final round of qualifying by Yulia Putintseva 6-1 6-0, but earned a reprieve into the main draw via Simona Halep's injury withdrawal.
And the Ukrainian made the most of her luck, dispatching of Barbora Strycova 6-3 6-0.
Cibulkova, meanwhile, continued to rack up some handy minutes on court, as she took two hours, 46 minutes to get past Kristina Mladenovic 2-6 7-6 (7-1) 7-5.
The Slovakian, ranked 58th, had played just nine matches since February coming into the WTA Premier event this week, but has tuned her match fitness with two tough three-setters - she played a three-hour contest with Tsvetana Pironkova first-up - ahead of the quarter-finals.
Mladenovic's fellow Frenchwoman Caroline Garcia ousted Cibulkova's compatriot and qualifier Magdalena Rybarikova 7-6 (7-5) 6-4.
Czech left-hander Safarova accounted for Romanian Irina-Camelia Begu 6-3 6-4, and the French Open finalist will take on Cibulkova for a spot in the semi-finals.